# Experiment 3 density determinations answers

Dig out soil 4” to 6″ deep with the same diameter as the density plate hole. Because 1 ml is equivalent to 1 cm3, these units are interchangeable. You will use the NaOH you standardized last week to back titrate an aspirin solution and determine the concentration Answer: An indirect measurement of volume would be by displacement of a liquid by a solid. You must SHOW your work! 1. The density of the cube is 3. Experiment No. In this experiment, you will measure masses and volumes to determine density. . you will need a graduated cylinder or a beaker. 16 Oct 2016 Density-complete-solutions-correct-answers-key. View Lab Report - Final experiment 3 from CHEM 1411 at South Texas College. Additional Work. 999 g/cm 3. 0 I T = I Equation 3 If all of the light passes through a material (and none is absorbed), A = 0 and T = 1; in this The density of helium is 0. The density of a solid is reported in units of grams per cubic centimeter (g/cm 3 ). Reply Delete It is suggested to use benzene as an immersion liquid while determining the density of glasses by archimedes principle. As the temperature increases, the density of a substance will be decreased, this will be discussed later in discussion. The density is then found by dividing the mass (178. 01 mL = 0. 5-1 litre) NPRA 014 test 14. the m and v line up and give us a <3 shape! While many struggle with calculating density (and may not like it that much), this is a little trick to make remembering density just a little bit easier! Why Is Density Important? Home Science Measurements Measuring density is very important for many different industries because the density measurement will help determine the characteristics of a material, for example, whether the material will float or sink. 8 Select and use the appropriate SI unit for a particular measurement (e. RCC 1. Since D = m/v and mL = cm 3, the density of water is 1 g/cm 3. 916 % (for Trials 2 and 3 only)* Mass Percent Concentration of 4. Determine the density of a solid or liquid 2. 0\% of the density of the liquid. Fill the graduated cylinder with water and record the exact amount at the bottom of the meniscus, or the curve formed by the surface of the water. )for mass and cubic centimeters (cm 3) for volume, then the units for density will be a) grams b) cm 3 c) g - cm 3 d) g/cm 3. The standardized thiosulfate is used in the Define the equation for density. Using a hydrometer, measure the density and specific gravity of three mixtures of automotive antifreeze and water as a function of temperature. In the design of a Bunsen burner, explain the purpose of a. The density of ice is 0. 4. Density of soils in the field – sand cone method. 11 Calibration of Glass Pycnometers (0. This experiment is designed to determine the molar concentration of acetic acid in a sample of vinegar by titrating it with a standard solution of NaOH. 3. This means that the value of density is independent of the quantity of matter present. Just click the link below to download. Record this volume on your data sheet, being certain to record it next to the correct solution label. Determination of the Density of Regular Shape Metals 1. Density is determined by dividing the mass of a substance by its volume: \[density=\frac{mass}{volume}\] Density is commonly expressed in units of g/cm 3 for solids, g/mL for liquids, and g/L for gases. 2. In most experimental work, the confidence in the uncertainty estimate is not much better than about ± 50% because of all the various sources of error, none of which can be known exactly. 5922 Explanation: Now, the density of the water is equal to 0. Each method has its own degree of precision. Do 3 trials and average your result. Overview Objectives. 5 divisions = 25 g. 02 mL. Mass can be easily measured using a balance. 1. . Perform test using SI units only. 7932 g/mL + 0. 1 mL) 2. 315 liters. Thus, in order to calculate the density of an object you need to know both its. them, recording their masses to 3 places past the decimal. 7087 M Vinegar Average Molarity 0. volume. 500 grams of sugar occupies a volume of 0. Conclusion: The dry density of the soil is ________g/cc. You will be using this value often during today’s lab. 5. 0 gram sample of brass and add it to a 150 mL beaker. The measurement of density requires two pieces of data and therefore requires great care in the making of both measurements so as not to lose precision. Make a copy of your lab notebook pages (do not tear out the originals) and attach your answers to the post-lab questions (if not in your notebook). You can access the problems below via the Load Homework dialogue in the File menu of the Virtual EXPERIMENT 3 DENSITY DETERMINATIONS. Density = mass of substance (g)/volume of substance (mL) In this lab, you will determine and compare the density of two sets of pennies by graphing mass vs. ) Post-Activity Assessment. Density is defined as the ratio of mass per unit volume. GEOTECHNICAL ENGINEERING LAB VI SEMESTER Page 30 GCEM. One way to do this is to mentally compare your answer against the density of water (1 gram per cubic centimeter). Take the cylinder to the back table and measure out EXACTLY 10. Record your answers in Data Table 1. What would be the mass of 100cm 3 of the metal that the cylinder is made of? 2. Wipe the water off of the penny. 8 g/mL All sample data is for aluminum (Metal A) and brass (Metal B). In physics, however, the density of water is stated as 1000 kg/m3. Calculate the average density of the five cylinders. It was determined that solids are the most compact (meaning they have the greatest amount of mass in a certain volume), gases are the least compact, and liquids are less compact than solids but more compact than gases. Taking care that no air enters, remove the eudiometer from the buret clamp, invert it, and place its open end underwater in the beaker. Lab: Determining the Density of Unknown Metals The materials list for this lab is simple: a balance, a graduated cylinder, and different pieces of metal. APARATUS & MATERIALS: ? Balance ? oil ? graduated cylinder ? water ? 3 test tubes ? solid unknown 3. Once you have calculated the density record your answer on your data sheet. 94g/cm^3. Measuring the volume of water displaced by an object will tell us the volume of the object. The density of an object can be determined from the mass and volume of that object. Other properties, such as appearance, melting point, and chemical reactivity, could then be used to confirm the identification. The empty bottle weighs 14. 56𝑔 14. Experiment 3 Introduction to Density INTRODUCTION The purpose of this experiment is to understand the meaning and significance of the density of a substance. This is shown by the increase in density from gas (0. If we use the units of grams (g. 8. 8 mL 3. Trial Sample 1 Volume Calculate the Density. 3 g/mL, 9. The experiment is about density change of salt solution and the buoyancy force due to density difference of the object (egg) and medium (salted water). Explain the difference between weight and mass. Experimental Methods - Water Displacement Many, if not most, objects are not a regular geometric shape. 50 11. 6. Erlenmeyer flask and stopper. Record your sample number (or substance name). The density of any substance is a ratio and may be calculated by dividing the mass of the sample by its volume. Why is it important to have a “control” in your experiment? Having a control in an experiment gives more accurate test results. the gas control valve The gas control valve regulates the rate at which methane enters the burner. Liquid volume can be translated into solid volume by the relationship 1 millilitre = 1 cubic centimeter, or 1 mL = 1 cm3. Using a 100 mL graduated cylinder, obtain roughly 20 to 30 mL volume of an irregular solid sample. It sinks right to the bottom! Fill the second drinking glass half-full with water. 7 g. It will either float or it will sink. 70 g/cm 3 and nickel has a density of 8. Determination of the volume by Archimedes' Principle produces a more accurate value for density in this case. INTRODUCTION This experiment involves the use of absorption spectrophotometry to quantify Teacher’s Manual 3. This will be the comparison area used to determine the area of the oleic acid solution cutout above. 10) A graduated cylinder has a mass of 50 g when empty. 1 to help you answer the following questions. (kg/m 3), m is the mass in (kg) and V is the volume of the sphere in (m 3). Show your work. These should always be reported whenever three or more determinations of the combined anhydrous I. Determination of the masses of 10 ml of water added from a volumetric pipet. Determine and record the volume of the distilled water to the nearest 0. (Volume=L x W x H) 3. Choose a volume between 1 and 100 mL. In order to find the density, I simply divided the mass found by the volume found. Pre-Lab Questions and Calculations: (show your work) On a separate sheet of paper complete the following problems before coming to lab. The Use of Volumetric Glassware. The volume of a regular object can be determined from its dimensions. Lab #1: Determination of Mass, Volume and Density Introduction In order to achieve reasonable results in experimentation, proficiency in the use of the SI (metric) system and with the measuring instruments commonly found in the laboratory is essential. All groups in each laboratory will share one set of standard solutions. This is true regardless of how much of the material you have. Higher density tells you that particles are closely packed in a substance and lower density tells you that particles are not closely packed in that substanceAnother example is that of between water Calculate the density of each sample. Specimen Volume (cm3) Mass The mass of 40 mL of water is 40 grams. Measure the Mass. For liquids and solids the mass is usually expressed in grams (g) and the volume in milliliters (mL). Try Other Activities. 00117m 3 To find the density of water, weigh an empty graduated cylinder and record the mass of the cylinder in grams. The measures made have more precision in that part of the experiment. To make your determination of the amount of ethanol isolated, you can estimate your percent alcohol using the table at the end of this experiment. 10 Density and Water Absorption of Aggregates Passing the 4. For example the volume of a cube can be determined from its length times width times height. Will the density of a material al ways be the same, regardless of its size? If so, why? 9. Fill the rest of the cup with water, almost to the top. 7958 g/mL + 0. Dave’s Density Assignment (written by Kris Young, Parkland College and revised by Laura B. Just how wrong they are depends on the kinds of errors that were made in the experiment. Fill the dry pycnometer completely with this solution and weigh. Calculate the density using factor-label method. D-5 - D- 7. Calculate the density of the solution described in Question #1. , the ratio of mass to volume in the calculation of density). Learn vocabulary, terms, and more with flashcards, games, and other study tools. Agree/ Assessment Instruments for Data Collection Answer Key. A block of wood 3. There are not any CCNA 4 lab 4. Float or Sink . Density Is a Periodic Property Lab Introduction Dmitri Mendeleev proposed the periodic law for the classification of elements in 1869-1871. Introduction . See Also: Definition of Plastic Limit . mass density = volume Students may agree that density is an intrinsic property, a property that is. 4 Calculating the Density of Liquid [5] A. What is the density of this volume of water? Whether students weigh 100, 50, 25 mL or any other amount, the density of water will always be 1 g/cm 3. 7083 M 0. 6. 676 J/Kg/oC. 9662 g/10. Run Virtual Lab. 50 10. 1 Determination*of*the*Mass*Percentage** ofCopperinaPenny* * Introduction* * This*experiment*will*cost*you*one*penny*($0. Discussion: Density is a very useful property. Objective. 50 0. 5 to 2 g specimen for testing. 0035 g divided by 30. Lactose Lab Answer Key Follow-up Questions: 1. cm 3 (iii) Density (D) of the solid block = Mass / Volume =. 00 mL of water. A cube has a side of 5 cm. The most common apparatus for routine determination of liquid volumes is the graduated cylinder. density at STP = mass of one mole / 22. g/cm 3 . The reaction is: 2 H + (aq) + 2 electrons -> H 2 (g) This experiment is based on the mass loss of the copper anode, but it is also possible to collect the hydrogen gas that is evolved and use it to calculate Avogadro's number. Density Determination Place a plastic weigh boat on the balance and tare the balance. Repeat step 2, each time adding 5 more pennies to those already on the balance, until you have used all 25 pennies. Continue rolling the thread until it reaches a uniform diameter of 3. Density is grams per cubic centimeter (g/cm3) for solids, grams per milliliter (g/mL) for liquids, and grams per liter (g/L) for gases. Density = 200 g/50 cm 3 = 4g/ cm 3 Give two possible explanations for why one sample is more dense than the other. When you place an object in a fluid it will do one of two things. Grain size distribution – mechanical sieve analysis. Density Determinations. There are a lot of different sugars, e. Calculate the average density of your unknown NaCl solution from your 3 mass and volume measurements in Part III Step 3 of the experiment. (Your answer will be more exact if you use a graduated cylinder instead of a beaker to measure the volume and weigh the liquid. 7 g/cm3 is read as: two point seven grams per cubic centimeter. What are the precautions taken in this Density = Mass/ Volume (g/mL) Trial 1: Density = 7. The number of determinations should be such that an additional one would make no significant difference to the average. Includes an extra sheet for addition The SI unit of density is always expressed in the unit of kg m-3 or g cm-3. 3- 50 mL Erlenmeyer flask and stopper 2. 27 mL. In this lab it is important to know the glucose content of each milk before the lactase is added in order to measure the effect of the lactase on the milk. 0 kg. Calculate and record an average value of the density measurements. THE DENSITY OF ITS VAPOR . Calculated volume would be measuring the side of the cube & getting the volume. 0\% submerged, the density of the block is 40. Using a 10. 7861 g/mL Average value of Density = (0. Write an executive summary of each procedure described in this lab. To learn the weighing technique – weighing by taring. Although this instrument does not permit as precise a determination of volume as do other devices, it is sufficient for use in the lab. The density of copper is listed as 8. Calculate the percent variation in the density values. The density of a solid is reported in units of grams per cubic centimeter (g/cm3). INTRODUCTION In Experiment 3, you applied heat from a Bunsen 5 Jun 2019 The units of density are commonly expressed as g/cm3 for solids, In Part A of this lab, the mass and volume of distilled water will be . Record the final volume of water. 0 cm on each side and has a mass of 27 g. 1 cm markings Calculator Plastic blocks, 3 Procedure 1. Green River Community College Lab 2 - Page 3 of 7 7. If a rock is added to the graduated cylinder, the water level rises to 75 mL and the total mass is now 250 g. 369 % HC2H3O2(aq) In this experiment, the sample of Datu Puti brand vinegar was analyzed via titration with a standard 0. Add four tablespoons of table salt to the water, and stir. This means that a 1 cm x 1 cm x 1 cm cube of aluminum would weigh 2. 3) with a large quantity of ethanol, the volume increase observed is not 18 cm3. Fill a 50ml Graduated cylinder to the 20ml mark with water. 41 g/3. The density of a pure substance is a characteristic physical property that can be used to identify the substance. Results for the Determination of Acetic Acid in Vinegar Trials 1 2 3 Molarity of HC2H3O2(aq) in 0. It is a 50 or 100-mL graduated cylinder, with 1 mL markings (measures to . 6 g/cm3; in clayey soils and aggregated loams, it can be as low as 1. Documentation. Also, determine . Immediately wipe up any spilled water to avoid a slip and fall hazard. Problem 2: You have a different rock with a volume of 30cm3 and a mass of 60g. The standard equation for density is ρ = m/v. Procedure. Calculate the density of the liquid. Re-clamp the eudiometer to the buret clamp so that the bottom of the eudiometer is about 1 cm below the surface of the water in the beaker. Unknown liquid A was found to have a density of 1. Weight of the sand to fill the cone, Wc = W3- W4 1. Make sure the tap water does not enter the flask. By Density and Refractometry. EXPERIMENT 2 . What is its Calculate the density by measuring the mass and volume of your samples. The most common units of measurement for density that you will encounter in this course are g/mL and g/cm 3. 7384 g/30. Determination of the Density of Solid Zinc Metal . The density of a material is always the same. To use proper weighing technique to determine the density of water, ethanol and hexane. For example, the mass density of gold is approximately 19. 96 g) by its volume (316 cm 3), or 0. g. Determination of the Density of Isopropanol Solution. Use the known volume of the flask to calculate the density of your solution. 711 kg Results from field tests 8. If the body density is known, it is possible to convert this to a % body fat using the following equation, which was derived by Siri: % fat= (495/body density)-450 Although the concept involved in determining body composition from body density is Lab Report Experiment 1 & 2 CHM-101 Amele Takpara Partner: Jessamyn Dupree ----- Experiment 1 ----- (Pre-Lab Questions) 1. 7932 g/mL Trial 3: Density = 23. 1 division = 25/5 = 5 g. It is necessary for the teacher to determine, ahead of time, the mass, volume, and density of the objects that the students will use. Submerge the flask as far as possible into the beaker. 59 cm3 of a metallic solid. volume (mL) The final significant figure is estimated to 0. Determinations of liquid, plastic and shrinkage limits. 4 g/mL, and 8. you can now see the volume of the liquid. The equation that describes density is: d= m v (Equation 1) where “d” stands for the density of an object, “m” stands for it's mass, and “v” stands for the volume occupied by that object. 3 kg. Answer: Weight is the force of gravity acting upon an object, while mass is the quantity of matter in an object. Explore a Murder Mystery. 85 g/cm 3 . record it. 66 g. 23. The property called density describes this relationship. Clamp the flask securely to the stand and heat the water bath to boiling. D-3. Use Table 5. Roll the test specimen between the palm or fingers on the ground glass plate to from a thread of uniform diameter. 566 g/cm 3. 93 ± 0. Do several (3-5) determinations of the wine before distillation and the residue after. Relative density, or specific gravity, is the ratio of the density of a substance to the density of a In SI units, the density of water is (approximately) 1000 kg/m or 1 g/ cm, which makes relative density calculations As the principal use of relative density measurements in industry is determination of the concentrations of Materials Required: Procedure: How to measure the gravitational mass of a solid using a spring balance? In real lab: Take a metallic solid block. In-situ Density Determination by Sand 3- Measure the weight of plastic Gallon fill out the table and include the answers to the following questions in your measured density = 8. In parts 1-3, three different A block of wood has a mass of 8 g and occupies a volume of 10 cm3. Repeat step 2 with “Metal B”. Irregular Solid 1. Density is an intensive property meaning that a substance’s density will be the same regardless of Calculate the Density. In Data Table 2 you will record your data as well as the data from all other groups in the class. Again, report each answer to 3. The bottom of the meniscus is between 22. 002 an answer key. Wash hands with soap and water after completing the lab activity. 4 liters If the molar mass can be determined, from the chemical formula, for instance, then the density can be calculated. Aft er the evolution of gas slows, add an additional 10 mL of water. Chemistry Lab report by Determining Unknown by Finding it's Boiling point And Density. 00% NaCl (aq). ) Materials for Experiments 3 & 4 It was determined that solids are the most compact (meaning they have the greatest amount of mass in a certain volume), gases are the least compact, and liquids are less compact than solids but more compact than gases. Intro to Chemistry, Basic Concepts - Periodic Table, Elements, Metric System & Unit Conversion - Duration: 3:01:41. In parts 1-3, three different methods are used to find volume of two solid Acid Base Titrations Introduction A common question chemists have to answer is Lab: Excel Graphs of Densities of Various Substances. Determine the volume of Metal A. Record your answer in Data Table 1. You are given a bottle that contains 4. Experiment. Set up a stand with an iron ring and wire gauze. This is not always the case, however; water is less dense as a solid than liquid. Heat Capacity of 1 Kg from data collected: Heat Capacity/Mass = 371/0. Density: Density is defined as mass per unit volume or ρ"="!! "" (1) where ρ is the density of the material, m is the mass of a given amount of material, and V is its volume. Cooking oil has a density between these two and therefore ice floats on the oil whereas water sinks. Clean the viscometer by the water and ethanol and dry it. Density is a basic physical property of a homogeneous substance; it is an intensive property, which means it depends only on the substance's composition and does not vary with size or amount. Experimental Errors. Two students each make three density determinations of samples of the substance. ) (Your answer will be more exact if you use a graduated cylinder instead of a 3 g/mL density of pennies Conclusion: In this lab, the pre-1982 pennies had an . 01g by using the top loading balance (Figure 2). On the moon the mass would be 6 kg. Density = mass units are: g or g where 1 mL = 1 cm3. Answers. Concentration and density are intensive properties. 00 mL volumetric pipet, transfer 10. I. The density of a material is always the same under the same conditions. Volume measurements are then combined with weight measurements, described in the previous experiment, to determine the density of a solid. The total mass of the bottle is 35. Show your work, and report your answer to the correct number of significant figures. Determine the density of a solid and a liquid using mass/volume. 142 = 2612. Hint : The size, mass, and arrangement of molecules affect the density of a substance. Determination of the Identity of an unknown liquid My Name The date My period Partner #1 name Partner #2 name Purpose: The purpose of this lab is to determine the identity of an unknown liquid by measuring its density, melting point, boiling point, and solubility in both water and alcohol, and then 2. Fill a 50 ml or 100 ml graduated cylinder about one-half full of tap water and read the volume to the nearest 0. 755 kg 7. 1 g/cm3. 90 g/cm 3, so measuring the density of a piece of metal would be one way to tell which metal it could be. 528 41. Lab 3. 7861 g/mL)/3 = 0. com, but it is FREE for the taking. IRubric EX796WC: Use the "Lab Report Format" to create your lab report. Chemistry 108 Lab #3 3. What is the density of carbon dioxide gas if 0. 23 Mass of copper (g) . As in previous editions, three basic goals guided the development of all the experiments: (1) the experiments illustrate the concepts learned in the classroom; (2) the experiments are clearly and concisely written so that students will easily understand the task 3. Determine and record the mass of your sample (be sure it’s dry). Density is mass per unit volume (D = M / V). TEACHER INFORMATION 1. Pages 35- 3. Answer the post-lab questions. 92 g cm-3 and that of water is about 1. Gently drop one of the eggs into the water-filled glass. 7 times the theoretical density. To properly measure density, we need a container whose volume is known to a high degree of. however, the density of water is stated as 1000 kg/m. 16 g/cm^3. soils, dry density can be as high as 1. (e. density of aluminum is 2. /p> Precautions: Let's try the experiment! Introduction. Related Projects. For liquids and solids, density is usually expressed in units of g/mL or g/cm3; these are equivalent since 1 mL is exactly equal to 1 cm3. Using this protocol, the vapor density is calculated by measuring the mass and volume of the vapor. Record the mass to the nearest 0. 9976 g cm−3, which implies that every cubic centimeter of water at the temperature you're performing the experiment has a mass of 0. Topic: Manifest Density. Standard molar volume is also useful for Density determinations at STP. 196 g occupies a volume of 100 mL? Answer:_____ 2. 00 Mass of filter paper and copper (g) 1. 27 g of water. Density = mass of substance (g) or Density = mass of substance (g) volume of substance (mL) volume of substance (cm 3 ) In this experiment, you will measure the mass and volume of several materials. 147 Trial 3 31. 05_LM_SE/TE_Lab04 5/17/04 10:30 AM Page 39 The units of density are commonly expressed as g/cm 3 for solids, g/mL for liquids, and g/L for gases. Grain size distribution – hydrometer analysis. In general, the density of a material is greatest when it is a solid and decreases as it changes phase to a liquid and from a liquid to a gas. 25 Mass of filter paper (g) 1. 5cm3 of liquid when floating in a certain liquid and 11. For example in chemistry the density of water is usually stated as 1 g/cm3. Determination of Density using a Ruler to Measure the Volume . The density of ice is about 0. Density is the mass of a substance per unit volume. Determine (1)the upthrust on the solid when floating (2)The density of the liquid (3)The upthrust on the solid when fully submerged. 3 7. 50 109. Invert the sand cone apparatus over the density plate and open the valve to tilt the hole with sand. substance. According to its nutritional label, orange soda contains 49 g of sugar per 355 mL serving. Fill one of the drinking glasses almost to the top with plain tap water. This is a collection of ten chemistry test questions with answers dealing with the density of matter. 01 mL. 25 Sep 2006 The task for our lab was to determine the density of water and compare our Data for determination of the density of an unknown liquid: 20 Apr 2015 calculated volume of cylinder (cm3) = Compare your experimental density with these values. Read text section 2. The probe is useful for accurately monitoring the temperature of the water contained in the calorimeter. 86 g Volume of sample = 10. Volume Measurements and the Determination of Density . Answer to Experiment 3 Determination of Density (12) Identity of the Liquid: DLH2D Mass of the 50 mL beaker (empty): . Density is the ratio of mass to volume. IO3 – + 8 I– + 6 H+ = 3 I 3 – + 3 H 2O (5) The standardization is an example of iodometry. Four different metal cylinders are investigated. Objectives After completing this lab, you will be able to: 1. 3 Determining Density. Vinegar is a common household item containing acetic acid as well as some other chemicals. 00 mL of D. Part A: Determination of Density of Solids I. To find the average density, I added the three densities I found, then divided that total by three to find the average. The percentage increase in the bulk density of Lawrence pure sand is 8. 3 Density Determinations Chemistry to accurately measure the density of a liquid. 3 grams. But often as well, the High Fructose Corn Syrup (HFCS) is measured and expressed in Brix ˚. 53 g; volume of solution = 8. It helps us identify unknown solids, liquids, or gases (See my diamond density example on lab 1 help page). You should also determine how pure your distillate is by measuring its density several times. Specimen Volume (cm3) Mass (grams) Density (gm/cm3) Activity 3: (Determine the Density of a liquid) Calculate the density by measuring the mass and volume of your liquid sample. Determination of permeability of a sandy Density is defined as the ratio of a substance’s mass to the volume it occupies. Density Word Problems Use the following formula to answer the problems. 8 mL 2. 7304 M (using only Trials 2 and 3)* of HC2H3O2(aq) Percent Difference 3. 50 122. The resulting graph, called a calibration curve, shows a straight-line relationship between the density of a solution and the concentration of solute. 01). EXPERIMENT 2 Measurement Instruments (Mass, Volume, and Density) TI QUESTIONS 1. P06 - General Chemistry I South Texas College Summer I 2016 Dr. Now calculate the lifting capacity (in Newtons), the left hand side of equation (1): _____ Density and Refractometry BRIX - Sugar Determination. 3 - Density Determinations CHEM 1411 P04 South Texas College Fall View Lab Report - CHEM Density Determinations Formal Lab from CHEM 1411 at South Texas College. 3 Weight, Density and Specific Gravity. The reaction between the excess zinc and sulfuric acid in step 9 is essential to ensure that there is so un-reacted solid zinc mixed in with the copper, and that any excess zinc is reacted to form zinc sulfate than is aqueous and can be poured out with water. Density can be calculated by dividing an object's mass by its volume. Compare your experimental density with the density of the known elements provided in the discussion section. Lab Experiments: 1. Some of the answers are listed at the end. 632 g/mL. Links. 0% too high. 23 g. Write the title and URL of the web resources you chose. By convention, we measure the level of a volume of liquid in burets or cylinders from the bottom of the meniscus. Perhaps when you were in high school you learned that the typical way in which you can tell what the object will do is by knowing its density In this part of the experiment, you will use a steam bath to evaporate two samples of the manganese (II) sulfate solution. 50 1132. 1 kg. Student A's results are 7. Calculate the volume and the density of the irregular object. 8 mL density of metal (g/mL) 10. Getting Started and FAQ. D-1. E xplain the probable source of error(s) in the experimental determination of the number of manual pages. ● To make calculations of volume and density, using proper units. Thus, if the first sample is 6 grams, make the next sample about 4 grams. Calculate the density of the water and record this as the density of a 0% solution. The answer is density in grams per milliliter. Worksheet: Have students answer the worksheet questions and hand them in for grading (see answers in the Wrap-Up Discussion, below). 9861 g/mL. Uponconsideringthedataandobservationsofthisinvestigation,the resultscouldbeduetothefact!thattherubbingiscoloredandcould Procedure for Determination of the Plastic Limit. 23 Hold the burner in your hand and move the flame slowly back and forth underneath the crucible to gently heat the sample. Go back to your lab station and reweigh the cylinder and contents and record the mass to the nearest thousandth. 01 g. Number each page. For example, 30. Calculate the volume and the density of the metal cylinder. Density of a Solid. It is impossible to make an exact measurement. To learn to use an analytical balance. Penny Set A was minted before 1982. How does your conclusion above relate to your prediction of the answer to your question? Density is expressed in units of mass per volume, such as g/mL or kg/m3. Do the same procedure for the two sets of alumina balls. 3- Di water 4- Baker 5- Ostawld viscometer 6- Pipet Procedure: 1. THEORY: When one mixes 1 mole of H2O (which has a molar volume of 18 cm. the density of a solution is plotted on a graph against the concentration of solute, a regular pattern is evident—density is propor-tional to concentration. 13 - 3 EXPERIMENT 13: THE IDEAL GAS LAW AND THE MOLECULAR WEIGHT OF GASES INTRODUCTION The ideal gas law states that PV = nRT where P = pressure in atmospheres V = volume in liters n = number of moles R = ideal gas constant = 0. 70 g/cm3; that of indium, 7. Vary sample sizes so they are not all the same mass. Therefore, the determination of density involves the measurement of mass and volume. 1 ml. 3 Determining Density – Page 7 3. Density is equal to the mass of an object, m, divided by the volume, v, of that object. 8713 g/20. 1-3. INTRODUCTION . Vary temperature from 100 C down to room temperature (use a water bath to aid in cooling the solutions). 5cm3 when fully submerged in the same liquid. Purpose: The purpose of this lab is to determine the identity of an unknown liquid by measuring It’s density and boiling point, and then comparing the results to the values for known substances. same 10 mL graduated cylinder with a small amount of 5. Float or Sink When you place an object in a fluid it will do one of two things. Compare the average density of the spheres to the density of chrome, which is 7:8£ 103kg=m3, by calculating the percent diﬁerence using your measured experimental value and the above-mentioned theoretical value. This container is known as a pychnometer. 2mm or 1/8 in. But benzene is a volatile liquid. From the 20g sample select a 1. Find the number of moles of oleic acid. Obtain a rubber stopper from your teacher and measure its mass. Therefore, all experimental results are wrong. 3, while the density of liquids is typically reported in units of g/mL. using the water displacement method. The density of the whole body, therefore, will depend upon the relative size of these two components. The SI unit of density is kg/m 3 but it will suffice in the lab for us to use g/cm 3 (remember, 1 cm 3 = 1 mL so 1 g/cm 3 = 1 g/mL). LAB STATIONStudents can practice calculating density using the water displacement method and graduated cylinders to find the volume of an irregular object, a triple beam balance to measure the mass, and use the formula Density = Mass / Volume to calculate density. You do NOT have to write a formal lab A solid displaced 8. Add 10 mL of water followed by 15 mL of concentrated nitric acid in a fume hood. In this experiment we used both an acid catalyst and heat to increase the reaction rate. Boiling point determination oBubbles first formed at 72oC; a steady boil was reached at 78 C. The d and r The d and r stand for the diameter and the radius of the sphere respectfully both in (m). You will be using this value frequently during today’s lab. These are most of the items you will use for doing density determinations. MOLAR MASS OF A LIQUID FROM . A typical drop of water has a volume of about 0. In this lab, students determine the molar mass of the volatile liquids ethanol and 2-propanol using the Dumas method. Use correct number of significant figures. Beverage Density Lab. Note that 1 mL = 1 cm3. When the water falls off of the penny, record the number of drops. Abstract: The densities of an unknown liquid and solid were determined by measuring mass using the weigh by difference technique and volume. To set up the steam baths, fill two 150 ml beakers approximately 3/4 full with water and heat on a hot plate until the water boils gently. 1 mg. 00 31. before starting the lab activity. 3𝑚 =2. 75 mm Sieve ASTM C128-88 3. C. The answers for each question are at the bottom of the page. Since different materials have different densities, measuring an object's density can help determine which materials are in it. The slash is read as the word “per. Weight of plastic Gallon+Cone+Sand (before use), W 5 7. It is the ratio of the intensity of light that emerges after passing through a material, I, to the input light intensity, I 0. EXPERIMENT 6 ABSORPTION SPECTROPHOTOMETRY: MULTI-COMPONENT DETERMINATIONS USING ABSORBANCE AND FIRST-DERIVATIVE DATA This is a group experiment. FV 2-16-11 . This hydrometer will do the job: The formula for density is D = m ÷ v, where m is the mass and v is the volume. 3 Density Determinations Chemistry 1411. It also tells you how particles are packed in a substance. 10 mL graduated cylinder 3. 05 mL. The study of chemistry involves not only observing changes in matter, but also measuring these changes. What is the density of water? (Answer: 1,000 kg/m 3 or 1 g/ml or approximately 8. 40 =. I hope that it will benefit many of you. 9976 g. Students may need to be coached in the determination of the volume of a cylinder from a . Transcript of The Determination of a Chemical Formula Lab Report. Using the Biuret Assay to determine protein concentration in an unknown sample requires, as a preliminary, construction of a standard curve made by assaying a series of protein solutions with known concentration. Precision vs. The 48 experiments in this well-conceived manual illustrate important concepts and principles in general, organic, and biochemistry. Be sure to use the bottom of the meniscus to measure the water level. Page #. Carefully immerse (dunk) the solid in the water in the cylinder. For each calculation type, show 1 example using equation, substitute, answer: 𝐷= 𝑉 = 32. When 30 mL of water is added, the graduated cylinder has a mass of 120 g. Do not mix up the samples. CH 3 COOH (aq) + NaOH (aq)-> CH 3 COONa (aq) + H 2 O (l) Finally, check to make sure your answer is reasonable. 00 10. a. 2 0. Calculate the density of the liquid by dividing its obtained mass by the volume indicated on the pycnometer. Determination of the density of a metal cylinder. Draw a schematic for a coffee cup calorimeter, labeling all of the parts. When written as a fraction. Volume/Density Lab Answer Key Object Mass Volume Density (mass/volume) 1. Analytical Balance Solid: 1. 7 2. Be sure to use the mass and volume based on the same number of objects. Check to make sure all of the materials needed are at your lab station. So, a cubic centimeter of water has a mass of 1 gram and fills 1 milliliter of volume. Measure the mass of each sample using centigram balance and record its mass in the table below. 31 g/cm3; and that of thallium, 11. This experiment conforms to the guidelines for the third laboratory experiment listed in the College Board AP Chemistry guide (the Acorn book). GRADUATED CYLINDER SAMPLE TABLE OF VALUES Final Reading (mL) Initial Reading (mL) Volume of H2O delivered (mL) Total volume of H2O (mL) Mass of the flask and H2O (g) Trial 1 10. The SI unit of density is always expressed in the unit of kg m-3 or g cm-3. Obtain an unknown object from your instructor. Using a dropper bottle containing only water, count the number of drops of water that you can balance on top of a penny. The ChemCollective >> Find activities >> Virtual Lab Problem List. You can thus use the density of water as a conversion factor to find the volume of 31. (Figure 6. Obtain a 100-mL graduated cylinder and add approximately 30 mL of water to the graduated cylinder. What is the density of the solid? 2. 28 𝑔 𝑚 Results of multiple calculations of the same type should be listed in table format. Least count of the spring balance. 0 g/cm3. Students may Repeat step 3 to divide the metal shot among the other four weighing dishes. 40 mL since each line corresponds to 0. The Organic Chemistry Tutor 511,983 views Start studying Experiment 3: The Use of Volumetric Ware and the Determination of Density. Penny Set B was minted after 1982. 3 Density Determinations B. Make a graph with experimental data. Questions not in italics do NOT need to be answered. A lab report discussing the determination of densities of known objects as well Students can then look at the activity of calculating density, and will learn the students to extend the knowledge learned from the density instruction lab. 063 g/mL and the density of metal # 662 was determined to be 6. Result: The density of the given solid (heavier than water) is . ) cannot be truly added when pure components are mixed. Trial Sample 1 1 2 3 Avg. What are the answers to chem lab 5- density determination? 2. Because the measurements. For example, if we graph the following experimental data: Mass (g) Volume (mL) 10. Cut out the shape and weigh it on the analytical balance. 5. docx), PDF File The 6 objects given were, 1 a wooden block, 2 a metal cube, 3 a metal slab, . The density of a liquid or of a solution is usually reported in units of grams per milliliter (g/ml). 30 mL and 22. Calculate the density of your sample and record this value in the data table. Calculate the area of this shape in cm2. As a result of this unit, students will understand: • Density Students will record data and fill in lab sheets on day 1 and day 2. Calculated volume would be measuring the side of the cube & getting the volum e. 20 cm 10 cm. Graphing Components welcome to the virtual density testing lab! density determination table: mineral . Apparatus: 1. Density Determination. What is the density of an object with a mass of 35 grams and a volume of 7 cm3? 8. • Student materials and enclosed air in order to make a density determination. Put a certain amount of liquid in the large bulge viscometer and pull it by pipette until the small bulge is full. Use the laboratory balance to measure the mass of the block. Introduction to Quantitative Measurement: Density Determination. Density Determinations and Various Methods to Measure Volume GOAL AND In this experiment, you will measure masses and volumes to determine density. For us, the pychnometer will be an. Make sure to display the trendline equation and R2 value on your chart. The density of the solid is 0. 1 Determination of Aspirin using Back Titration This experiment is designed to illustrate techniques used in a typical indirect or back titration. Determination of Molar Mass by Vapor Density. mass and its volume. 0 C. 425 mL equals 0. 179 kg/m 3 and the density of air is 1. 7 g/mL 8. 9 Density and Water Absorption of Aggregates Retrieved on a 4. Experiment, however, showed that while the quotient on the left hand of this equation was fairly constant for a great number of substances, yet its value was not gR but 7 R; this means that the critical density is, as a general rule, 3. What is the density of Answer:_____ this block? 3. Determine the combined mass of the cylinder and the water to the nearest 0. Determine the mass of the block to the nearest 0. 6801 M 0. You should have both a 250 mL beaker (from the Lab Kit) and a 100 mL beaker (from the Patriotic Colors kit), with 10 mL markings. ) The Vernier computer interface and stainless steel temperature probe. Familiarity with the various instruments used for making physical measurements in the laboratory is essential to the study of experimental chemistry. 16 d) Density 3. Seat the density plate on leveled clean test ground. 002 Experiment 3 – Introduction to Weighing Technique and Density Determination Objectives 1. 3 g/mL. ” A density of 2. Density is a measure of a substance’s mass-to-volume ratio. On the same sheet of graph paper, measure a square or rectangle about 5 to 10 cm on each edge. Introduction Density is mass divided by volume, so that the density is 45 g divided by 15cm3, which is 3. D-9 You will not be graded on the whether your answer is correct. Density. 3 lbs per gallon. In the first four density determinations in Data Table 4, what major factors might account for the experimental errors that were obtained? Lab #1 Measurement of length, Mass, Volume and Density Readings Before you begin this laboratory read chapter 1 of the textbook. Review their answers to gauge their comprehension of the material. water into the plastic weigh boat and record the mass of the 10. Lab Report Title: The Concept and Measurement of Density Purpose: To gain an understanding of the physical property of density. Important chemical properties are density and hydrophobicity, as they determine the best way to remediate contaminated sites. Make a graph of period number on the x-axis versus density on the y- 1. Module Overview. first you must fill the cylinder or the beaker with water. Calculate the density of the aluminum ruler and paper clip samples by hand or using Excel. absolutely precise in determining our answers will lead to consistent results. D. Density Sweet Density Calculate densities of candy bars and predict what will happen when they are placed in water. 10 g/3. Beakers should never be used to measure volume. 00 g cm-3 at 0 °C. The teacher doing the lesson decides whether the answers will be exact or rounded. ). For example, aluminum has a density of 2. transmittance, T. Rinse the . then place the irregular solid in the cylinder or beaker. Answer: An indirect measurement of volume would be by displacement of a liquid by a solid. 1-3 the pipet over a sink (or waste . Density is also an intensive property of matter. Still working with the same 25 pennies, It is necessary to make a number of repeated determinations (at least three) and to average the results because the dry density of the soil varies appreciably from point to point. Measure the Volume. In this laboratory exercise the density of a solid, a pure liquid and several Density Worksheet With Answers - calculate density worksheet with answers together with density worksheet with answer key 9th also density worksheets with answer key also density worksheet with answer key , density problems worksheet with answers with volume and density worksheet with answers key together with density practice worksheet with The density of a liquid is usually reported in units of grams per milliliter (g/mL). chart plotting density data points as a function of mass % and then add a linear trendline. Please see the graph for further details. , meters for length, seconds for time, and kilograms for mass). With either of these techniques you must let the test substance equilibrate to room temperature before measuring. 08206 L⋅atm/mol K T = absolute temperature in degrees Kelvin The number of moles, n, can also be represented as m/MW where Lactose Lab Answer Key Follow-up Questions: 1. Tie it with a thin Density Determination Lab - Free download as Word Doc (. 3 answers online. Determination of the density requires measuring the mass and volume of the same sample at a specified temperature. In fact, most chemical principles cannot be fully understood without obtaining and analyzing some quantitative data. 8 Viscosity Determination using the Brookfield Thermosel Apparatus ASTM D4402-91 3. It is defined mathematically as v m d volume mass density where the letters d, m, and V represent density, mass, and volume, respectively. 00 ml of a salt solution. It has a mass of 250 grams. Introduction to Engineering Design Activity 5. 917 g/cm 3 and then density of water in its liquid state at 25 o C (room temperature) is 0. Protein Determination 10/5/06 3. 7917 g/mL Observations: The unknown liquid may evaporates if it remains open so it may cause some uncertainty. After observing trends in the properties of elements when they were arranged in order of increasing atomic mass, Mendeleev made a startling prediction. Updated January 30, 2018. Determine the density of the object using the methods described above. Students will need to find the mass and density of four unknown fluids, given a 10 mL sample of each. Staple all pages and turn it in. accuracy. Put viscometer vertically in the water bath at the desired temperature. Answers to Closure Questions:. Students may B. Density is an intensive property meaning that a substance’s density will be the same regardless of the size of a sample. Using water displacement since it works for any kind of shape. Experiment 1 – Determination of Density. Write the purpose of the lab. 10 mL. volume mL cm3. 33 and the percentage increase in the bulk-density of Sargodha crush is 12. Laboratory: Dr. Place a 600 mL beaker about half full of tap water on the gauze. EXPERIMENT 3 DENSITY OF A REGULAR SHAPE SOLID DENSITY OF AN IRREGULAR SHAPE SOLID View Lab Report - Lab Report from CHEM 1301 at South Texas College. 1 Density Determinations Density Determinations Lab Chemistry 1411. I. Experiment 3: The Use of Volumetric Ware and the Determination of Density. Density of an unknown object 1. 919 kg 10. 29 kg/m. Record the temperature of the boiling water. Mass of solution = 12. Assuming the density of liquid water is 1. In this experiment, equipment for the measurement of volumes is described and used. Compare the density of different liquids, change water's density, and do 4 liquid (If you are using glass jars, use 2/3 cup of liquid, which is approximately 150 ml . 387 kg 9. Heavy materials should have density values greater than that of water. Density relates what two measurements to each other? 7. Determination of the masses of 10 ml of water added from a beaker. MATERIALS: Dry 250 mL Erlenmeyer flask, piece of foil (~3” x 3”), rubber band, 800 mL beaker, 500 mL graduated cylinder, iron ring, ring stand, wire gauze, Bunsen burner, test tube clamp, Hot Hands. Current Collection of Virtual Lab Problems. Ariel weighed an object on her balance and recorded a mass of 24. Density is the measure of a material's mass per unit volume, used in many aspects of science, engineering and industry. **The*penny*must*be*minted* Uponconsideringthedataandobservationsofthisinvestigation,the resultscouldbeduetothefact!thattherubbingiscoloredandcould answer in milliliters, then in cubic centimeters. 00 21. He predicted the existence Quantitative Chemistry II Lab 3 iodide in acid solution to yield triiodide, which is subsequently titrated with the standardized thiosulfate solution. Obtain a plastic block from your teacher. Accuracy: The precision of a measurement is a measure of the mutual 30 EXPERIMENT 3: CONCENTRATION OF DYE IN GATORADE Associated with absorbance, is the term. The mass of an object is 6 kg on earth. 181 Trial Vo Investigation #3: "Density Determinations" These questions have been taken from lab quizzes given in previous years. 8-3- 01 Use appropriate vocabulary related to their investigations of fluids. CHEMISTRY I LAB: DENSITY WHAT TO TURN IN: Hypothesis, Data Table 1, Data Table 2, Calculations, Graph, Questions #1-8 OBJECTIVES To measure the mass and volume of samples of two different metals volume of metal (mL) 3. Record the mass in the data table. sucrose, malt sugar, glucose, HFCS. Volume of hole, V2 = (W5-W6-Wc)/ γd (sand) 0. 3 grams per cubic centimeter. 2 Investigate and describe the relationship between the mass and the volume of various objects. (ii) Mean volume of the solid block (V) =. By convention, plain water has a density of 1. Then fill the graduated cylinder to approximately the 7 mL mark with 5. Determination of the mean mass of an Erlenmeyer flask and stop per. Calculate the densities of Metal A and B. Record the block number and color of the block in the table below. Experiment #1 — Density Calculation Materials (for each lab group) Balance Metric ruler, 0. Prepare a graph in Excel with volume as. The number of Significant Figures in measured numbers shows the uncertainty of the measuring device. Light substances would float on water, so their density should be less than that of water. the pipet over a sink (or waste container) and release your finger allowing the liquid to drain out of the pipet. Post-Lab Questions: 1. Include enough detail that Determination of Molar Mass by Vapor Density Adapted from Advanced Chemistry with Vernier & Laboratory Experi ments for Advanced Placement Chemistry by Sally Ann Vonderbrink , Ph. ) A screen shot of the Thermometer program located in the 223 Lab Programs folder on the computer desktop. Make measurements to the nearest 1/10 of a millimeter using a meter stick. Her teacher told her that there was obviously something wrong with her balance because it was giving her a reading which was 30. Moisture-density relationships by Standard Proctor Method. Record its identity. Weight of plastic Gallon+Cone+Sand (after use), W4 3. Density determination of a metal cylinder Density (d or ) is defined as mass (m) per unit volume (V), or mathematically: Therefore two lab measurements are required: mass and volume. An object that is denser will have a greater mass for a smaller amount of volume compared to an object that is less dense. Weight of plastic Gallon+Cone+Sand (after use), W 6 3. 01g. g/cm 3. Collect all the excavated soil and weigh it. Clean all loose soil out of the test hole with brush and spoon. ● To practice graphing the relationship between the circumference of a circle and its diameter using spreadsheet software Estimated time to perform this experiment: 3 hours. 8 mL 33. Therefore, the density of ice is less than the density of water so that is why ice floats in water. Sonnichsen and Virginia Lehmann, Parkland College) Report Requirement: Answer all of the questions/do all the computations requested in italics. Density of Pure Liquids Make sure to use a 25 milliliter graduated cylinder. Best Answer: Density is the mass per unit volume of a substance. 032 Trial 2 21. 8g/cm3. In parts 1-3, three different methods are used to find volume of two solid metal cylinders (Al and brass). This table shows you several ways to determin the amount of ethanol in your sample based on density. What that does is cause the grams to cancel and the answer to be in mL. This simply indicates that extensive properties of solutions (such as volume, free energy, enthalpy, etc. 0 g/mL, how many moles of water are in one drop of liquid? Weigh a 1. 77 Mass of water evolved (g) . Density is represented with the Greek letter rho, ρ. Density Lab. In each case, the measure of the volume limits the accuracy. What are the precautions taken in this 1. Beakers: Must always be placed on a level surface. Density Column Lab — Part 1 Worksheet To improve groundwater quality, it is vital to for environmental engineers to know all of the physical and chemical properties of the contaminants. Example Abstract for the Density Lab. Use thermometer to find out the temperature of the water inside the graduated cylinder. Includes an extra sheet for addition Data: Density determination Mass of sample = 7. ● To make basic distance, mass, density, and time measurements. Determination of the masses of 10 ml of water added from a graduated cylinder. 890 * . 0 and that’s measured in g/cm 3 or g/ml. A plastic safety ring is often used to protect the cylinder if it is knocked over. 4753 g/cm3 WRONG! The uncertainty in the measurement cannot be known to that precision. It was important that the flask used in this experiment be completely dry before the unknown liquid was added, so that any water present would not vaporize when the flask was heated. 02 mL = 0. Use a vernier caliper to make measurements to the nearest 1/10 of a millimeter. In your notebook, enter the experiment title, date, your name and name of partner. Calculate the mass of the liquid by computing the difference between the recorded mass of the pycnometer when empty and filled with liquid. In this experiment, you will investigate the uses and limits of the various types of volumetric glassware. Calculate the density of the block by using the equation: (Density=Mass/Volume). Density: Accuracy and Precision Introduction: Density is a measure of a substance’s mass-to-volume ratio. Choose three solid samples of the same metal with the same regular shape from the box provided and record the sample number (or letter label, color). Help. Best Answer: Since the block is 40. 002 Determination of Molar Mass by Vapor Density Adapted from Advanced Chemistry with Vernier & Laboratory Experi ments for Advanced Placement Chemistry by Sally Ann Vonderbrink , Ph. Use your graph to find the mass. 1M NaOH solution. Calculations 1. (3) because the mass already has that symbol. From the experiment performed we came to know that the bulk-density of a material in compacted form is greater than the bulk-density of a material in loose form. Record the mass on your answer sheet to the nearest 0. doc / . 0mL Melting point determination oLowest temperature reached for unknown in ice bath = 4. 014 DATA ANALYSIS - Construct two graphs using Microsoft Excel’s I have added this lab to my store on TeachersPayTeachers. If drops are sticking to the inside of the pipet it is not clean and not delivering its claimed volume. Since 1 cm3 = 1 mL, these units are often used interchangeably. B. The specific heat capacity of a solid or liquid is defined as the quantity of heat required to change the temperature of a unit mass of a substance through a unit change in temperature. 50 21. (Figure 5. Strictly speaking of Brix,only the pure sucrose content in a solution is meant. The volume of the object is equal to the volume of water it displaces. Mass of dehydrated sample (g) . Experiment 10A . Complete the table below or include a print of your Excel worksheet. 7958 g/mL Trial 2: Density = 15. 75 mm Sieve ASTM C127-88 3. experiment 3 density determinations answers

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