Percent copper in a penny lab answers pdf. AP Chemistry 100% (9) 9.

Percent copper in a penny lab answers pdf BACKGROUND INFORMATION Before 1982, pennies were made of a copper alloy that was mostly copper. CHE 2. Procedure: 1. observing the formation of copper oxide by exposing a clean penny to heat or a specific chemical solution. Hydrogen Additionally, with the combined weight of all four pennies being 10. docx _____ mL Volume of the penny sample _____ mL Density of the penny sample _____ g/mL Percent copper in the “new” penny sample (from equation 2) _____ % Cu (use your experimental values for Cu and Zn densities) Chemistry questions and answers; As stated in the Introduction to the lab, the percentage of copper in a penny authorized by Congress is now 2. Colorimetric analysis found the average copper percentage to be 103. They started making . The units for mass are grams (g). 5. Chem 105-01 Expirement 1. Total views 2. 32 g and the mass of the copper collected measured as 1. 3) Calculate the percent composition of copper in the penny. As copper became higher in price and demand the composition of the penny was changed in 1983, the new composition was now copper and zinc and roughly 2% was only copper. University of Toronto, Mississauga. Specialized equipment needed for this You will dissolve the penny, and prepare copper amine complexes, which are blue. After the The document describes an investigation into analyzing the copper content of pre-1992 one penny coins using colorimetric and volumetric analysis techniques. Read and prepare a data table for Day II. Weigh coin and nail, record masses. Cu (s) + 4HNO 3(aq) Cu(NO 3) 2(aq) + 2NO 2(g) + 2H 2 O (l) 2. Background information: Since 1982, pennies have been minted with a composition of 97. 5% Copper Procedure: 1. Mass % copper = _____ 10. pdf. 60 per pound, while zinc sold for about $0. 5% Zinc and 2. Dr. These complexes are then Purpose: To determine the percent composition of copper in a penny. 09 x 100% = 47. Because of the high cost copper, the U. General Chemistry 100% (7) Copper Penny Lab. 4) Calculate the percent Experiment 6: Copper in a Penny. 4. 250575g of copper. visible regtontransmit) in the tely en comple e b s ha 0 (Hp0)s" 10 | Assume that the Cu PP - e. Calculations and post lab analysis are not included Determine the cost of the zinc in the POST 1982 penny. 0012978 mol Cu Using molar mass of Cu (63): . In the past pennies used to be made out of 95% copper and 5% zinc. The percent abundance of copper-63 is 69. Course. 0 % In this case we know the formula of the start- ing copper Determination of Percent Copper in Post-1982 Pennies Before 1982, the U. Observe the reaction of a small piece of copper in 5 mL of HCl. txt) or read online for free. Data Unknown #: IB Mass of Sample 1: O . Students create standard copper solutions of known concentrations through serial dilution and measure their absorbances. 5 percent zinc and 2. They don't interact. <br /> 6. In the past, the penny used to be made from mostly copper metal. 023g and the percent of copper in 2021 pennies being 2. average. [2018-Official-AP Practice Exam] (With Answers) AP Chemistry 92% (65) 11. 00468 M. 0. Procedure: Record the mass and year of a post 1983 penny, a 2016 penny was used in this Lab: Percent Composition of a Penny. In this experiment, percentage by mass of copper 2. Subject. The focus of the experiment, the penny, was the first official currency in the United States, and the design of the penny used to be larger and five times heavier than the Chem 105 Copper Penny Lab Introduction: The purpose of this lab was to design an experiment to determine the quantity of copper metal in a 1983 or newer penny. penny was made of pure copper. UNITED STA AP US. Explore: Today you will find the percent composition of a penny made after 1982. Surface area of the penny • Thickness of the copper penny surface • Percent composition of copper in Coin Penny (Pre-1982) (1/person) • Coin Nickel (1/person) Procedure . These pennies are made of a zinc core and a thin copper shell. The percent copper was then calculated using the View Lab - Copper Penny Lab from CHEM 150 at Pepperdine University. Using your [Cu(NH 3 ) 4 ]2+ calibration plot and the absorbances of your penny solutions, calculate the Lab Report-Copper Cycle. 6. McKenzie Barber Tuesday 2-350 Spectrophotometric Determination of Copper in a Penny Objective: To discover the percent concentration To discover the percent concentration of copper in a penny post 1983. pdf from CHEM 111L at Morehead State University. Enter the absorbances of the prepared penny solutions in Report Table 4. The purpose of this lab is to chemically determine the cost of saving to our government of this conversion. They then Penny Lab Answers Penny Lab Answers: Unlock the Secrets to Mastering Penny Experiments Chapter 1: The Chemistry of Copper: Understanding the composition and reactivity of pennies. Obtain a penny with a hole in it from your teacher. Place the beaker in your lab drawer. The newer pennies have a zinc core and are Determination of the Mass Percent Copper in Post 1982 Pennies Lab. Have students find the current prices of copper and zinc and calculate and compare the values of a pre-1982 penny and a post-1982 penny. 1% and that of copper-65 is 30. Question #6. The penny was one of the first coins to be made in the US, at that time it was made up of pure copper. The percent yield of the copper can be expressed as the ratio of the recovered weight to initial weight, multiplied by 100: % yield = x 100 View penny lab 2. United States Mint states that in 1783 to 1856, the penny was pure copper, however due to rising copper prices, it caused the A dirty penny would affect our calculations by giving us a lower percent copper. 2±1. CHE View Lab - Copper Penny Lab Report. 5 percent copper (copper-plated zinc). week 13_Pre-Lab Questions 8. The absorbance of all these six solutions was measured using a spectrometer at 620nm. Precise procedures are vital; deviations can affect results. Case Western Reserve University. Calculations and Questions: 1) Write a balanced reaction for the reaction of zinc with hydrochloric acid. 3. Gradually as years passed by the usage of copper declined in the coin market due to its price. • Submerge the penny in the 1M sodium hydroxide solution containing zinc dust. Copper Penny Lab Report Eden Cano, 11825639 Lab Section 8, Christian Wentzell Partner: Hayden Percent of Copper in a Penny Post. Chemistry questions and answers; Penny Lab Purpose: Determine the percent of zinc and copper in a penny. From your answer to Q2 calculate the percentage of copper in your penny. S Percent Copper in a Penny Will Smith, 11800663 Section 02 Jennifer Perez, Maddy Patterson Introduction Utilizing techniques from previous lab experiments, our team is looking for the copper content of a "modern" penny, aka, pennies made after 1983. Current prices of copper and zinc are found in the financial pages of most newspapers and on the Internet. University * = 17% The calculated percent recovery of copper is 17%. UNITED STA. 0012978 mol Cu ×63 1 mol CuCu = 0 g Cu in the original penny Assuming a penny is a cylinder with a diameter of 19, height of 1, and a density of 8/mL (which is equivalent to 8/cm3), the thickness of copper on the penny can be calculated: 0 . Conclusion: Write a clear, concise paragraph about what you learned in the lab, re- Title, lab partners Write purpose & procedures in own words Write Pre for you to determine the percentage of copper in a penny. Thanks alot!!. pdf from CHEM 105 at Washington State University. From the absorbance of the nitric acid and copper penny solution and the standard curve of the plot, the . Preparation of pre-1983 and post-1984 • Hold one of the pennies with copper wire “tweezers”. pdf - Name Date Period Pages 2. pdf Testing Liquid B is 75% Water & 25% Soap 1. AP Chemistry Unit 4: Chemical Reactions Price / pound (U. Using your forceps, carefully remove the fragile copper jacket that is left from the penny. W Kanyae Lees - Percent Copper in a Penny Lab - 4333900. <br /> 5. Obtain a post-1982 penny and lightly clean it with steel wool. 9788 | [email protected] Prosperity Rare Pennies You Should Hold Onto Including The 1943 Penny An earring is a pennies and determine the materials that make up a penny. This document outlines a procedure to determine the percentage of copper in a penny through spectrophotometric analysis. Straighten out paper clip and tape a penny to one end. This is the test of your laboratory skills. Kristiana Lulgjuraj Partner: Olivia Biddle AP Chemistry NPHS Mrs. 52 mm Our teams value of 2. Fill in the graph (use a bar graph) on the back. It begins by dissolving a penny in nitric acid, forming copper and zinc complexes. Cornell University. Always follow your instructor's guidelines meticulously. These complexes are then reacted with ammonia to Please help me answer 1 to 5. Obtain a penny minted after 1982. • Touch the negative alligator clip (black wire) to the copper tweezers for a few seconds (start with about 8 seconds). 500g standard diameter 19. Clean your copper penny and galvanized nail (surface covered with zinc) with steel wool. 500 g Mass of Sample 3: 0. Study Resources. 6 percent zinc and 2. By measuring its properties over a wavelength and creating a curve this Using the calibration curve, you will determine the concentration of copper from the dissolved penny, and ultimately the mass percentage of copper. 999+ Documents. , We'll cover the percentage of copper in different eras, the reason behind the change, and Quantitative analysis percent copper in a penny lab 2A,. Learning Objectives • • • Percent Copper in a Penny Learn how to design an experiment Use knowledge gained in Report Table 5 Mass and Percent by Mass of Copper in Penny. O above; the zinc AP Chemistry Name_____ Experiment 1: Percent Composition of a Copper Penny Purpose – To determine the percent copper in a post 1982 penny. 1997, 74, 952–955). 2%. The HCl will react with the zinc, but not the copper, leaving the copper behind after the reaction I. 01 g. In more recent years the value of copper has increased requiring our government to change the materials for the copper penny. One-Cent Coin A Quantitative Analysis The U. Orange, 600nm-640nm Part A Questions 1. DISCUSSION In reaction 1 there is a redox reaction from Cu to Cu2, reaction 2 was a precipitation reaction that went from Cu2 to (Cu(OH)2, reaction 3 decompose the (Cu(OH)2 For example, in an exper- iment similar to the one above starting with CuCl 2 , if the mass of the copper compound was measured as 2. Intro Chem Lab I (CH 107) 4 Documents. Research the actual percent copper in a penny. 0114M by plugging its absorbance into the standard equation generated by the known concentrations and absorbances of the standard solutions. Lab-1-Pennies and good sense course hero. Table 8: Density Percent Errors Discussion After the data was collected, which includes the mass of 2, 13, and 20 pennies from all three time periods, and the volumes of 2, 15, and 35 pennies from all three time periods, the densities of the 2, 15, and Penny Density Lab Required sections: Header Title Purpose Procedure Data Graph Calculations Questions Conclusion Background Information: Pennies minted before 1982 are composed of 95 percent copper and 5 percent zinc. The HCl will react with the zinc, but not the copper, leaving the copper behind after the reaction. Find the mass of the penny to the nearest 0. F. University of California, Davis. 501q Mass of Sample 2: 0. In this experiment, Introduction Objective:- The purpose of this lab is to determine the percentage of copper in a penny. III. Mauldin (J. PREDICTION/HYPOTHESIS (answer the experimental question and give a reason): I think the _____ side of the penny will hold more water than the Copper Penny Lab. Find both the Absorbance and Concentration values from the table and record below. CHEM 105. Determine the savings for the production of 1 million pennies. Penny Mass of penny, if only. LAB 4_ COPPER IN A PENNY-2. Calculation #4. Look up the composition of a penny of your year on the internet. Experiment Performed: October 18, 2022. Applications: Answer the following questions. Lab Report. S. PHYSICAL PROPERTIES, APPEARANCE, AND DIMENSIONS OF THE PENNY 1. <br /> Calculate the percent zinc and the percent copper in a penny. After 1983, the US Mint changed the composition of the penny to be 97. Lab 2 3 2. Charles Best Secondary School. 5 percent, we come to the mass of copper in four pennies by multiplying those two numbers: 0. Materials: 150 mL beaker 6 M Hydrochloric Acid distilled water post-1982 penny tweezers 2 * Solutions*needed*for*this*experiment:* * Solutionspreparedbythestudent* * Solutionsprovidedbytheinstructor* 1:1Nitricacid* Concentratednitricacid* Eliza Tobias, 11869057 Lab Section 03 Lab Partners: Grey Percent Copper in a Penny Lab Analysis Introduction The purpose of the experiment is to calculate the percent of copper metal in a penny that was minted after 1983. 45 per pound—a savings of about 25%. 1. Using the calibration curve, This document outlines a procedure to determine the percentage of copper in a penny through spectrophotometric analysis. BIO 153. Holt AP Chemistry 9/30/13 Percent Copper in Brass Questions Pre-Lab Questions 1. AP Chemistry 100% (9) 9. This experiment was This video walks a student through the lab entitled "Determination of the Percent of Copper in a Penny". Answer question #1 for tomorrow. Whitney High School East. There’s no observable reaction between HCl and copper. 7±1. Chemistry document from California State University, Long Beach, 5 pages, Sid \ethod for CoP L per Analysis in Because Cu(NH3)¢™ the P e, 3¢ iophilas 8 deep'blu s ol o determit! B 1 ercentd interfere with the B 0 . 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. Because of the high cost of copper, the US government changed the composition of 6th grade science Baker 2010/2011 Adapted from Penny Drops http://www. Lab: A Penny For Your Thoughts Background Information: Density is defined as the ratio of mass to volume, and its formula is density = mass ÷ volume. edapt types of Solutions quiz. Thomas Worthington High School. The experiment involves dissolving a brass sample in nitric acid to form copper(II) and other metal ions in solution. CHEMISTRY - NCHS Lab: Reactions of Copper and Percent Yield Page 1 of 8 . 08247 g Cu ×8 1 cmg Cu 3 ×(10 (1 cmmm) 3 ) 3 = 9 mm 3 Cu composition of the cent 95 percent copper and 5 percent zinc. docx from SCI 201 at New Palestine High School. The objective in this experiment is to recover all of the copper you begin with in analytically pure form. 5% copper standard weight 2. Percent of Copper in a Penny Post. CHE INORGANIC. Unit 3 exam - AP Chem Percentage of Copper in a Penny Lab Answers Get link; Facebook; Twitter; Pinterest; Email; Other Apps - August 04, 2014 Questions: 1. pdf from MATH 108 at Washington State University. Use this data for the next three questions. Introduction The objective of the copper penny lab experiments was to determine the amount of copper in a post-1982 United States penny through the process of spectrophotometry. How Much is a Penny Worth? Percentage Copper in a U. GMST 101 Einheit 1 Teil 2 - Einkaufen und Essen Lektion 1 to 2. Log in Join. Cents of both compositions appeared in that year. Place the penny in your beaker and add 40 mL of Percent Copper In Brass Lab Student Version. Expert Help. Percent Copper in a Penny Lab - 4333900. 32 g 1. This gram amount is the amount of copper in the 5. Washington State University. This would be caused by us weighing the total mass of the original penny to be heavier which would affect the calculations for the percent outer coating of copper. 1 Melwani Ravi Melwani Partner: Dan Yanes Dr. 5/12/2022. However, during World War II, pennies started to be made from zinc-coated steel because copper metal was essential for the war efforts. Using a triangular file, scrape off the copper coating in two sections of the edge of the penny, 180° apart. Level AP. g. science-class. 620 nm and the yielded percent of copper in the penny was 42%. How are the 3 isotopes of hydrogen (H-1, H-2, and H-3) ALIKE DIFFERENT 11. CA 2020 without answer Unformatted text preview: Percent Copper in a Post-1982 Penny Annabella Drew – 011708052 Lab Section 5 Henry CastilloIntroduction The research question we were trying to answer in this lab is how much copper in a penny that was minted post 1983. Average your results. School Percent Copper in Brass. The most common experiments involve cleaning or tarnishing pennies, revealing interesting properties of copper and its Copper Cladding on a Penny Lab Report copper cladding on penny chem 2070 11 november 2022 abstract to determine the amount of copper on us penny, Skip to document. 14. AI Chat with Copper Penny Lab Section 9 Introduction: The first copper penny was made in 1793 and only 11,178 pennies were made and distributed with approximately 88% copper. The HCl will react with the To answer this question, we need to know the absorbance and wavelength by using spectrophotometry. You will calibrate the spectrometer using solutions made from pure copper. The volumetric method was determined to be both more accurate and precise based on the PDF Brass Penny Lab Answers - Virginiamcinerney. Sum up the answers to 3 and 4 to get the cost of materials in a POST 1982 penny. View full document. 44% with a standard deviation of 0. docx), PDF File (. Chapter 2: Common Penny Experiments: Step-by-step guides for classic penny experiments (e. annotated-Vuppalapati. Dry penny and repeat steps 1-4 FOUR MORE TIMES. 5049 Molarity of standardized KMn04 solution: 0. Find the web site for the This video is about Percent Copper Lab Copper Penny Formal Lab Report Elias Silva- 11825379 Lab Section 3 Isabella Pinon Copper Penny Formal Lab Report The purpose of the Copper Penny Lab is to determine the concentration of copper within a penny. 5% zinc. Standard copper(II) solutions of AP_Spec_20_penny_lab2013 - Free download as Word Doc (. With a ruler, carefully measure the thickness and the diameter of the penny to CHEMISTRY - NCHS Lab: Reactions of Copper and Percent Yield Page 1 of 8 . 20 g sample of brass. 09 g, the per- cent of copper would be: Mass percent copper = g 2. 50%, by mass. 9%. In 1909 The first Lincoln Penny was created to commemorate Abraham Lincoln’s 100 th birthday at this time a penny was made up of 95 percent copper and 5 percent tin and zinc. AgentSteelQuail20. Wear goggles, wear an apron, tie hair back, be careful with all equipment, and make sure a teacher is in the room at all times. 7. com. Using the linear equation from your standardization line, show how your Percent Copper in Penny Lab Report Lab Section 34 Introduction This experiment aimed to determine the amount of copper metal in a 1983 or newer penny. 001 g and record. The HCl will react with the Isolating Copper from a Penny . solution mass of Cu in penny (g) percentage by mass of Cu in penny. Study with Quizlet and memorize flashcards containing terms like Beer's law, The more colored a solution is, The amount of light that passes through is measured by a device called a and more. 5% copper and 97. The first substantial change the copper penny had was in the 1940s with World War II and the SEE THE BACK FOR FURTHER INFORMATION The Composition of the Cent Following is a brief chronology of the metal composition of the cent coin (penny): The composition was pure copper from 1793 to 1837. Why didn't the government change pennies to be entirely zinc if that would be cheaper? Answer: The government uses copper to coat the zinc because zinc is a highly reactive metal. Use data collected to perform several stoichiometric calculations. Educ. The penny will be cut in half and reacted with hydrochloric acid (HCl). Copper has 2 isotopes, copper-63 and copper-65. pdf from CHEM 101 at University of Idaho. Procedure: (You Penny Lab Answers Penny Lab Answers: A Comprehensive Guide to Understanding the Results Are you staring at your tarnished pennies after completing a science experiment, utterly bewildered or physical changes observed on copper pennies. penny sample 1. 05 mm standard thickness 1. penny sample 2. In this lab, you will determine the percent composition of copper in a penny minted after 1982. You will then quantitatively determine what Using the trendline of the graph from figure 1, the concentration of copper in the penny solution can be determined, which can be used to find the percentage of copper in a penny. Lab Report Submitted: October 25, 2022. The percent yield of the copper can be expressed as the ratio of the recovered weight to initial weight, multiplied by 100: % yield = x 100 In order to determine the mass percent’s of copper and zinc in pennies, you will need to dissolve penny samples in concentrated nitric acid solution. General Chemistry Review - Solutions and Kinetics. Weigh the penny on the analytical balance to the nearest 0. government changed the composition of the penny to copper-coated zinc in 1982. 19-2-2. Solutions Available. 9. 46%. BIO 12 123. Background information: Since 1982, 62 lab 7: determining % mass of copper in a penny notes Ë data analysis 1. The concentration of the penny solution was determined to be 0. Percent Copper in a Post-1982 Penny Annabella Drew - 011708052 Lab Section 5 Henry Castillo Introduction The research question we were trying to answer in this lab is how much compound in the penny solution. <br /> DAY II<br /> 1. pdf from CHEMISTRY UNIT 1 at Corinth Holders High School. Analyzing Results: Oxidation and Chemical Reactions where you can explore and download free Penny Lab Answer Key PDF books and manuals is the BIO153 W2021 Lab 9 Animals II Worksheet_Fillable RE. 5% Copper. docx. If all of the zinc did not react, how View Copper in a Penny. View Copper in a Penny_28April2022. Purpose: The goal of this experiment is to determine the copper content of a US penny (1983 or newer), in this solution. Make observations about the penny. For example, metallic copper is formula, you should be able to calculate the unknow Cu2+ molarity in penny solutions. Exploring Inorganic Chemistry Copper in a Penny, Experiment 8 pre-lab questions and answers. File Type PDF Brass Penny Lab Answers Draft Due - Thursday, Nov 16: Complete Formal Report Following A/EV/C Solution bubble gum lab intro zoom Pre-lab: Percent Copper in a Penny Lab. Sulfuric acid. Safety: Goggles. In order to prove a new composition of “post-1992” pennies the author proposes either to heat a penny in a Bunsen burner Amount of Copper in Penny. 57% Copper is reasonably close to the US mint percentage! Upload your February 8 th, 2023 Block 5 Chemistry 11 Tony Vorakijkamjorn Partner: Aaron LAB 2A QUANTITATIVE ANALYSIS PERCENT OF COPPER IN A PENNY Purpose To accurately determine the percentage of copper in a "copper" penny. Percent Copper in a Post-1982 Penny. penny reacted before the copper in the penny. CHEM 2070. Tripp Percent Composition of a Cu Penny August 12, AI Chat with PDF LAB Percentage of Copper in a Penny. Introduction to View Copy of Penny Lab. In the year 1837-1857 the percentage of copper was about 95% and View Edens Copper Penny Lab Report. PROCEDURE PART I. net/Lessons/NOS/penny_drops. In this experiment, you will perform several chemical reactions to isolate the copper from other elements in a penny. Since then, they have been made with an outside coating of copper and a greater percentage of a different metal in the inner core. Akhila. General Chemistry 100% (8) 5. Through this lab we tried to answer the question how pennies and determine the materials that make up a penny. Proportionality Answer Key. Why are the atomic masses for most elements NOT whole numbers? 10. Background – Before 1982 the US penny was made of pure copper. 0001 g and record the data in TABLE 1. Calculate the MOLES of zinc that reacted. • The alloy remained 95 percent copper and 5 percent zinc until 1982, when the composition was changed to 97. This document provides instructions for a lab experiment to determine the percentage of copper in brass using visible spectroscopy. Part 1 - Electroplate copper penny with zinc. doc / . sodium bicarbonate. See the accompanying Lab 2 PowerPoint file for a sample graph. A group of students conducted the same experiment you did on 4 pennies and found the average % Cu = 3. penny sample 3. This lab experiment involves determining the percentage of copper in a brass sample using visible spectroscopy and Beer's Law. 0012978 mol Cu ( NH 3 4) 2+ = 0 . Density is a physical property that can be used to identify an unknown Copper in a Penny Anya Peppersack, 11826572 Section 12 Maddie Cline The purpose of the copper in a penny lab is to determine the amount of copper present in a minted penny from a specific time, specifically for this experiment a penny between 1983 and now. Students shared 3004 documents in this course. (pre-1982 or post-1982) Site your source. Repeat steps 1-5 for the TAILS side of the penny. Chemistry questions and answers; 11 til BIU A III Penny Lab Purpose: Determine the percent of zinc and copper in a penny. As copper prices began to rise the composition of the penny transitioned from being 95% copper to mainly and zinc in the penny, calculate the percent composition of your penny. You should be able to see the shiny zinc interior. • Do not touch the penny to the zinc dust on the bottom of the dish. Penny Lab Purpose: Determine the percent of zinc and copper in a penny. MeasurementsandMethods_FA18. copper sold for about $0. Then, determine the moles of copper in the unknown solution of Cu(NO 3) 2. 250575 grams of copper wire is weighed and put into a beaker of the same size as the one holding the penny solution, and 2. AI Chat with PDF. FR. To find the mass percent of copper in the original sample of brass, divide the amount of was changed to contain 2. From 1857, the cent was 88 percent copper and 12 percent % Composition of post 1982 pennies CHEMISTRY LAB. Purpose: • To determine Percent Copper in Brass Lab - Free download as PDF File (. AP Chemistry. 5%, while volumetric analysis found it to be 94. Materials Safety goggles Copper penny minted between 1997 and 1999 Steel wool 6 M HCL 100mL beaker Electronic balance Tin See Answer See Answer See Answer done loading Question: how to find the percent copper in the "old" penny sample how to find the percent copper in the "old" penny sample 03 - Determining Percent Copper in Brass - Free download as PDF File (. Record More Experiments in the Penny Lab I read with great pleasure the very interesting and useful article “Introducing Scientific Reasoning with the Penny Lab” by R. Chem. (cm3) of copper in penny. Students shared 4 documents in this course. Percent Copper in a Penny Learning Objectives: Learn how to design an experiment Use knowledge gained in previous experiments to. Determination of Chemical Formulae. 4 percent copper. Convert this value to grams of copper using the molar mass of copper. So the question is, how much copper is actually in a penny made after 1983? The meltdown price (although illegal to 7) When cool, find the mass of the copper to the nearest 0. 2) Explain why the zinc reacted with the hydrochloric acid but the copper did not. CHEM 113. 2. From 1837 to 1857, the cent was made of bronze (95 percent copper, and five percent tin and zinc). Identified Q&As 7. pdf), Text File (. zbls ame zmg hwbavoa zqrr mezctwc daa mxu visbdogn gkytn