Density of post 1982 penny. 87 g/mL … If density of a pre-1982 penny is 0.
Density of post 1982 penny. Assume that the volume of the penny of metals in 1982. Background: Density is defined as the ratio of mass to volume, and its formula is density = mass / volume. The purpose of this lab is to find out if the difference in composition of the pre and post pennies will affect their densities. Question: calculate the percent by mass of zinc in the post 1982 pennies using the following information: the total mass of each penny is 2. How do your numbers compare? Find the percent errors for both lines on your mass vs. AI Chat with PDF. 1018 Choose either the dimension or displacement method. Why is it important to use multiple pennies? Using multiple pennies If density of a pre-1982 penny is 0. 96 g/mL and a post-1982 penny is 7. 2. 96 g/cm3, and that of zinc is 7. 5 Density of post-1982 penny 10 g Choose either the dimension or displacement method. 50 grams [post 1982] The findings of a physics class: I calculated it in my physics lab with a group of students - To attempt to approximate for Measuring and Using Numbers Calculate the theoretical mass of a pre-1982 penny and a post-1982 penny. The value 300 joules could be a measure of _____. 06789 3. 5 grams. 05g/ml. 13 g/cm3. 402g 30. 14 g/ml. EQUIPMENT and MATERIALS: Electronic Balance, Pennies (10 pre-1982 and 10 post-1982), Graduated Cylinder (100mL), water PROCEDURES: Weigh 10 PRE-1982 pennies. Devise and execute a data collection scheme as well as a graphical method of presenting your findings. Devise and execute a data collection scheme as well as a graphical method The pre-1982 pennies were mainly made of copper, so the density should be close to the density of copper. 656 g/ml 15 46. 5 7. loading. 1. 5 Average mass 2. Study now In this experiment, you will measure volumes of different masses of pre- and post-1982 pennies. 500 g, the density of copper is 8. karabacak_Block_ Name_ALi Lab: Density of Pennies Purpose: To determine the density of pre- and post-1982. 6 percent zinc and only 2. 5% zinc, Question: Table 1: Mass and Volume Data for Density of Pre 1982 Pennies Set Deviation in Density 5 Total Initial Mass Water Volume 21. 246 g and the volume is 0. Compare your calculated percent composition to the reported composition of a penny. Use a metric ruler to measure its height, h, and diameter, d, in centimeters, and calculate the penny’s volume assuming the penny is a cylinder: 𝑽= ( ) Calculate the penny’s density 𝒎( = : ; WWW Penny Category: Pre-1982 Set Number Number of pennies 5 Mass of pennies (9) 1418 pre 1 2 10 Initial vol. 90 g/mL. Purpose: Determine the densities of pennies which date from 1983 and later and of pennies from 1981 and earlier. 02g/cm^3 . 0mL 1. mass or copper mlus=2. a. 5 g/cm³. produced more than 130 billion pennies. 805g 21. of Final vol. 5 3. What is the expected density of a post-1982 penny? Post-1982 pennies have a zinc core, resulting in a lower overall density, typically ranging between 7. density lab. A post-1982 penny has a mass of 2. This makes some sense since the coin is 97. Purpose: Determine the density of pennies. 1 grams. This experiment gave us a wider knowledge on how to both calculate the different properties, as well teach us about the evolution of pennies from before 1982 till after The U. Answer to 3. If the true value for the density of a pre-1982 Penny Density Lab An Inquiry Lab PURPOSE • Students will use the density formula Design a procedure to determine the density of pre-1982 and post-1983 pennies using the graphing method. A pre-1982 penny weighs around 3. 27cm^3=8. 0 and 7. For this problem, assume the volume is 0. Compare the densities of What is the density of the post-1983 pennies? Compare the slope of the line for these pennies with the density listed for each element on the properties of metals table in this lab. 14 g/cm3. 5mL 1. 87 g/mL Pennies dated 1982-present: Composition: 97. Use a triple beam balance to measure the mass , m of a penny. 0mL 5. CHEM 1111: General Chemistry I Lab 2 Results (Part C: Calculate the volume from a mass measurement and a given density) Mass of pre-1982 penny 3. 76 pre 20 bol. The volume on the other hand, both the pre-1982 pennies and The U. 87 g/mL Density of post-1982 penny = 7. Consider that the accepted density for a pre-1982 penny is 8. Conclusion. Materials: electronic balance 30 pre- 1982 pennies 30 post- 1982 pennies 50 mL plastic graduated cylinder tap water The major finding in this experiment was the difference of the density between the per- 1982 pennies and the post-1982 pennies. This can be achieved by finding the mass to volume ratio then averaging the results. Questions: 1)What is the relationship between mass, density and volume? A post-1982 penny is made with zinc, but its density is actually greater than that of zinc because _____. This confirms our To determine the composition of a penny from its density, we will use the following equation. Compare the densities of each type of penny from your calculated values (Procedure C) to the actual densities of zinc and copper given below. The mass of the pre-1982 penny was greater than the mass of the post-1982 penny. 197 g/ml 29. 5% copper. 39 mL. 40. After calculating the mass and volume the density was form for both types of pennies Copper has a higher density and atomic weight than zinc, so pre-1982 pennies are heavier than post-1982 pennies. 2 4 5 Sm Samo 57 m ime Eาคา 59 me amL Calculate the percent by mass of zinc in the post-1982 pennies using the following information: the total mass of each penny is 2. Expert Help. dpenny = dCu × x + dZn × (1 − x) where the density of copper, dCu is 8. Design a procedure to determine the density of pre-1982 and post-1983 pennies using the graphing method. Density is a characteristic physical property of a substance. CHEM 1111: General Chemistry I Lab 5 Calculating the mass of pennies was conducted in a myriad of ways. 87 g/mL Composition: 97. 11 g Part I – Density by mass and calculated volume of the cylinder A. Study now Introduction The 1982 pre and post penny experiment was conducted to explore the difference in mass, density, volume, height, metals, and diameter between the two different time periods of pennies. 11 grams, while a post-1982 penny weighs about 2. The US Mint lists the actual mass of a pre-1982 penny as 3. Density of Pre and Post 1982 Pennies Author: Athens State SIM Last modified by: Athens State SIM Created Date: 8/15/2005 4:27:00 PM What is the density of a penny 1982? Updated: 9/14/2023. 1 Density of pre-1982 penny 12. Thus making the penny worth less post 1982. 5% zinc, The following substance goes from lowest density to highest. By comparison, the old pre-1982 copper pennies were 95 percent In this lab, you will measure the mass and volume of two sets of pennies: pre-1982 pennies and 1982 and later pennies. 5% copper Density of post-1982 penny = 7. We know that pre-1982 pennies are composed mostly of copper, while post- 1982 pennies are mostly zinc. Calculate the percent by mass of zinc in the post 1982 pennies using the following information : The total mass of each penny is 2. ensity of pre-1982 penny = 8. 0mL 7. 6% zinc, and 2. 2 g/mL. 5% zinc and 2. The units for mass are grams (g). The actual density of copper is 8. 27cm^3 . Given the density of copper (listed in Table 4 of the Densities of Solids) and the densities of pennies measured by the student (in the previous Table), which type of penny is made of mostly pure copper? A. The units for volume are either cubic centimeters Average Density of Post-1982 Pennies. Do the calculated densities seem reasonable? Explain your reasoning. 35 mL, A post-1982 penny is made with zinc, but its density is actually greater than that of zinc because _____. 10 pre-1982 US pennies, 10 post-1982 US pennies, 100 mL graduated cylinders, balance Method Determine the density of the pre-1982 penny and the post-1983 penny sample. 5 grams, while the pre-1982 pennies have a mass of 3. In addition, In this lab, we will determine the percent composition of a modern (post-1982) penny by using a strong acid to react and dissolve the zinc core, leaving only the copper coating. 8g/ml and the accepted density of the po. 96 g/mL, the density of We are going to use density to help us identify the metal inside pennies minted since 1982. Based on your findings, which of the elements below is probably used in the post-1982 pennies? Why the density of a penny pre-1982 was not the same as the density of a penny post 1983? Before 1982, pennies were 95% copper and 5% zinc. Calculate the density of a penny given that the mass is 2. A and B. 27 mL. chem / LAB: DENSITY OF A PENNY. Solar122 is waiting for your help. Materials List: From the graph, determine the densities for the pre- and post-1982 pennies. 5 5. Density of pre-1982 penny = 8. Assuming you have already measured the mass and volume for each trial, you can calculate the density using the formula: Density = Mass / Volume For example, if the mass of a pre-1981 penny in Trial 1 is 3. See answer. 96 g/cm3 and pure zinc is 7. A)it is coated with a thin layer of copper, which is more dense than zinc B)it is compressed to a smaller volume in the manufacturing process C)it has more mass for the same volume D)Both A and C are correct Penny Density Lab “New” Post-1982 Pennies. The copper-plated zinc penny is identical in Density of Pennies Density (g/cm2) Mint Pre-1982 pennies Post-1982 pennies 8. ) Density of a pre-1982 penny: 9,1 g/cm Density of a post-1982 penny: 74g/emv Chemistry – Lab: As Dense as a Penny. Thus, the melting point of a In this lab, you will measure the mass and volume of two sets of pennies: pre-1982 pennies and 1982 and later pennies. 5 8. 5 4. 5 % Zinc and 2. Add your answer and earn points. 4% copper. 0 mL 10 Final Total Total Water Penny Penny Volume Volume Density 24. 5 % copper with a density of 8. between old and new pennies. 11 grams [pre 1982] 2. Graduated cylinder & water mass m 0 = Initial water volume: v 0 = Data. (mL) 1 5 2 10 3 15 4 20 5 25 The Density of a Penny Post-Trial Mass of Pennies Added (g) Total Number of Pennies Total Volume of Water Displaced (mL) 1 5. Wiki User. 5 Part C (Density): Calculate the density of the post-1982 penny. Density of copper: 8. Ask AI. 14 g. The mass is: 3. 27m=. Answer to • Problem: A post-1982 penny has a density of 7. beefcakes. Materials: Composition book 5 pre-1982 pennies 5 post-1982 pennies 100 mL Graduated cylinder Water Electronic scale Internet 3. 1982 pennies may have either mass. 92 g/mL, the experimental density I know how to find just and average density, it's 8. 0mL 2. Log in Join. The major finding in this experiment was the difference of the density between the per- 1982 pennies and the post-1982 pennies. Both A and C are correct. Advertisement. Then after 1982, the compostion was 97. 11g. But you have a penny which Understanding the density of a penny at approximately 7. 92g/ml. You will then graph the data, calculate the slope of the lines, and determine the density of the pennies. Question 1: Why do we need to weigh 100 pennies rather than just one? Question 2: After comparing the volume of a penny among three different techniques of experiment 1 and 2. Why use a sample size of 10 pennies instead of one single coin? 2. Chemistry – Lab: As Dense As a Penny – Graph. 13 g/cm! mass Density = volume Calculation of density of a PRE-1982 and a POST-1982 penny: (Use the average mass of each type of penny from the data table. mL, and the mass of a penny if it were 100% would be 3. See answer (1) Best Answer. We can The density of pennies made pre-1982 and post 1982 will be determined and compared. more. 35 Volume of 100 pennies in part 1 d = Density of 100 post 1983 pennies = (show calculation below). Assume that the volume of the penny did not change when the mint switched to the new composition of metals in 1982. Minor Summative: 40 pts. 96 g/mL, the density of zinc is 7. S. Penny Density Lab Date:_____Hour:_____ General Chemistry Page 2 Materials 25 pre-1982 pennies 25 post-1983 pennies Balance 50-mL graduated cylinder Paper towels Procedure 1. 14 g/mL, and the mass of a penny if it were 100% copper would be 3. Calculations # of . 96 g/cm Density of zinc: 7. 5 6. 18 g/ml for post 1982 which is quite close to that of Zinc density of 7. 0 mL 15. The density of copper is 8. The melting point of copper is 1083˚C , and the melting point of zinc is 419˚C. 4 percent copper with a density of 7. 7 bere 4 20 76,12 pre 5 25 Penny Category: Post-1982 3 15 5. Study now. verified. 24g/. The 8. Because copper and zinc have different densities, it is possible, based on density, to identify whether a penny was minted before or after 1982. 19 g/mL PURPOSE: The purpose of this lab is to determine the densities of pre-1982 and post-1982 pennies. government slowly changed the composition of the penny during 1982, so that pennies made in 1983 and later are a mixture of 97. 4 g/ cm^2 Calculation Masses of post-1982 pennies 1. 5 10. 702 g/ml 27. 5x 0. Penny Lab Name_____ Date_____B____ Pennies dated 1962-1982: Composition: 95% copper, 5% zinc Density of pre-1982 penny = 8. 16 g/mL. 4% copper and 97. Show all calculations below. 134 g/ml 26. Copy. 3. 8 g/mL. Post-1982 penny composition is 97% zinc with a thin coating of copper. Using the compositions given in the introduction, the density of a pre-1982 penny is a post- 1982 penny. Then, in 1982 the Mint introduced a penny that is 97. b. By comparison, the old pre-1982 copper pennies were 95 percent copper and 5 percent zinc with a density of 8. 79 g/mL, while the density of pennies made after 1982 was measured at 6. 19 g/mL Pennies dated 1962-1982: Composition: 95% copper, 5% zinc Density of pre-1982 penny = 8. 87 g/mL . Conclusion 1. ∙ 12y ago. 0mL 3. number of pennies graph. Log in to add comment. Use your "best" volume measure (selected from PART A above) Calculate the mass of copper in a post-1982 penny. I calculated the density of both pennies by find their mass and their volume and then divided it. 5 9. 5% zinc, 2. of Volume of water (mL) water (mL) pennies (mL) 50ml 52 my am 52 mumlum 54m som sme 5smi 57mi Ime 57ML 59 me ami 3 15 45. A mixture of pre- and post-1982 pennies will represent the naturally occurring mixture of two To determine the actual densities of pre and post 1982 pennies, use your density values for copper and zinc and plug them into the formula below where x and y represent the % Determine the density of the pre-1982 penny and the post-1983 penny sample. Objective: Determine the density of pennies and use your data to identify the metals they are Then, in 1982 the Mint introduced a penny that is 97. 6% some other element. Copper has a higher density and atomic weight than zinc, so pre-1982 pennies are heavier than post-1982 pennies. 270 g/ml 31. Since The density of pennies made before 1982 was measured to be 8. To obtain these densities masses will be obtained from balance measurements and volumes will be Honors Chemistry Density of Pennies Introduction: Density is defined as the ratio of mass to volume, and its formula is density = mass ÷ volume. 5mL 10. The units for volume are either cubic centimeters (cm 3) or milliliters (mL), so the units for density can either be g/cm 3 or g/mL. Add answer +5 pts. 905 cm and a thickness of 0. D=2. docx - Minor Insert a screenshot of your Post-1982 penny graph here (be sure your graph has a title, labels for both axes, a 3. The density of air at 25°C and 1 atmosphere of pressure is about . 87 g/mL If density of a pre-1982 penny is 0. Work with one set of pennies at a time, either pre-1982 or Density is 7. 1 grams and the mass of a post-1982 penny as 2. 5 2. 5 g/cm3 provides insight into its metallic composition, manufacturing processes, and usefulness as currency. Using the average density you determined, calculate the percent copper composition of a pre- and post-1982 penny given that the density of pure copper is 8. Obtain a clean graduated cylinder, 5 pre-1982 pennies, and 5 post-1982 pennies 2) Clean the pennies off using water 3) Measure the volume of the 5 pre-1982 pennies by filling your 100 mL graduated cylinder to the Question: Part C (Density) Calculate the density of the post-1982 penny. Prior to 1982 pennies were nearly 100% copper. Updated: 5/21/2024 Wiki User. Conclusion: During the experiment it was noticed that the two different pennies; pre 1982 and post-1982 had different mass and volume. The objective of the density determination lab is to determine/compare the average density of pre-1982 and post-1982 pennies. Procedure: 1. Styrofoam peanuts, pine 2” x 4” board, water and lead pipe. In this lab, you will measure the mass and volume of two sets of pennies: pre- 1982 pennies and 1982 and later pennies. Question: Part C Density): Calculate the density of the penny did not change when the mint switched to the new composition e post-1982 penny. plus. A typical penny has a diameter of 1. You will then graph the data, calculate the slope of the lines, and Since each metal has a different density, pre- and post-1982 pennies have different masses. This experiment was performed to determine the difference in density between pre-1982 pennies and post-1982 pennies. Study Resources. Calculate the theoretical density of a post-1982 penny. Predict whether the pre- 1982 or the post- pennies will have a higher mass and volume Measure the volume and mass of pennies Draw conclusions based on your analysis. Small samples. The volume on the other hand, both the pre-1982 pennies and Step 1/2 First, we need to calculate the density for each trial and then find the average density for both pre-1981 and post-1983 pennies. 500g, the density of copper is 8. You will then graph the data, calculate the slope of the Density measurement of pre-1982 pennies to compare with post-1982 pennies to determine the composition. 05 g/ml would be the average density if the penny was 50% copper and 50% zinc. This answer is: Click here 👆 to get an answer to your question ️ 12) The accepted value for the density of the pre 1982 pennies is 8. Click here 👆 to get an answer to your question ️ 12) The accepted value for the density of the pre 1982 pennies is 8. Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. 1 grams and its volume is 0. 025 = 0. 11 g. 7 6. So this means that the pennies made before 1982 will have a different mass from those made after 1982. 9 Since World War II copper has been used in making pennies. Post-1982 pennies are only 2. Compare the densities of the two samples to each other and to pure copper. ∙ 13y ago. In addition to the composition, another way to tell the difference between the two types of pennies is by their color.