Percent copper in a penny lab answers pdf 4 solution stoichiometry. DISCUSSION In reaction 1 there is a redox reaction from Cu to Cu2, reaction 2 was a 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. History: The penny first started circulating February of 1793. To determine the average percent by mass of copper present in a penny using UV-VIS spectroscopy DISCUSSION Copper pennies minted from 1864-1981 contain over 95% copper with the remaining composition either zinc or a combination of zinc and tin. The pre-1982 pennies were 95% copper and 5% zinc. Our penny solution’s absorbance is DAY 3 - Record the mass of your penny. In this lab students will calculate the mass percentage of copper and zinc in a post-82 penny through simple quantitative analysis. doc / . 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. Introduction The lab that was done was to find the percent composition between zinc and copper of two pennies. View Alec Regan - Lab 25 Floating Penny - 888349. 2 % of the total mass of the core is due to zinc, you can use your previously calculated value for the total mass of Zn and calculate the mass of the core: Total mass of Zn I. % Composition of post 1982 pennies CHEMISTRY LAB. 5% Copper Procedure: 1. Find the mass of the penny to the nearest 0. The intensity of light was measured as a function of wavelength for the ascertainment of concentration of Cu(NH 3) 4 2+. Find the web site for the United States (US) Mint and record the information for a new penny in Report Table 7 below. In 1962, tin was eliminated from CHEMISTRY - NCHS Lab: Reactions of Copper and Percent Yield Page 3 of 8 1. docx. 6. 5% zinc base. S. A group of students conducted the same experiment you did on 4 pennies and found the average % Cu = 3. 32 g and the mass of the copper collected measured as 1. Thomas Worthington High School. Mint, Answer in your own words and write them down in paragraphs Determination of Copper in Brass Concentration of Solutions Introduction Analyze percent copper by preparing a series of dilutions of a known copper solution and comparing their colors. Percent Percent Copper in Brass Lab - Free download as PDF File (. BIO153 W2021 Lab 9 Animals II Worksheet_Fillable RE. include the equation in words, a substitution, and a boxed answer with units • Calculate the percent View Edens Copper Penny Lab Report. After we had based it off the calibration curve of the Cu2+ compound, we got the 2. UNITED STA AP US. Exam 2 ELISA. Determination of Copper in a Penny Chemistry 112L Section 001 September 10, 2014 Analysis Questions 1. emilypetersen43. 6 percent zinc and 2. 996g of DAY 3 - Record the mass of your penny. Specialized equipment needed for this In this lab, you will determine the percent composition of copper in a penny minted after 1982. ajameson75. Copper Penny Lab Kiley Graph: 1. As 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. Purpose: The goal of this experiment is to determine the copper content of a US penny (1983 or newer), develop familiarity with spectroscopic determination of concentration, and practice good data gathering and dilution techniques. 501q Mass of Sample 2: 0. Next we can find the percent composition of copper in our brass: 0. Solutions Available. You will plot two lines on this single graph (one line for each data set). Percent copper in the penny = Show work, circle answer: Wrap-Up Questions: 1. The percentage of copper in a post-1982 penny is 2. Obtain a penny with a hole in it from your teacher. ReneeDS420. 3) Calculate the percent composition of copper in the penny. Calculation #4. View More. Page 4 of 10 CHEM 120 General Chemistry Laboratory A Penny for Your Thoughts Name_____ Pre-Lab: A Penny for Your Thoughts. Course. So the question is, how much copper is actually in a penny made after 1983? The meltdown price (although illegal to in this solution. Background information: Since 1982, Determination of the Mass Percent Copper in Post 1982 Pennies Lab. One-Cent Coin A Quantitative Analysis The U. Instrumentation. 5% of zinc and 2. 001 g and record. Chemistry questions and answers; Penny Lab Purpose: Determine the percent of zinc and copper in a penny. 500 g Mass of Sample 3: 0. Percent Copper in a Penny Learning Objectives Learn how to design an experiment Use knowledge gained in previous Copper Penny Lab. Procedure: We weighed and recorded the mass of our penny. Current prices of copper and zinc are found in the financial pages of most newspapers and on the Internet. 023g and the percent of copper in 2021 pennies being 2. Background information: Since 1982, pennies have • Pre-1982 pennies are 95% copper and 5% zinc; post-1982 pennies are 97. Analysis of a Copper Penny Sabrina Palacio, ID: 11833651 Chemistry 105, Lab Section 30 Lab Partners: Bella and Jessica Nunez Introduction In the experiment, we wanted to test how much copper is in a penny made after 1983. F. Answer question #1 for tomorrow. Using the linear equation from your standardization line, show how your 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 Introduction Objective:- The purpose of this lab is to determine the percentage of copper in a penny. View full document. Prepare*a*blank*solution*using*10*mL*of*ammoniumhydroxide*and*QS*to* 100. 14. Record the class average for Maggie Wang Mrs. In the past pennies used to be made out of 95% copper and LAB Percentage of Copper in a Penny. 44% with a standard deviation of 0. Then, determine the moles of copper in the unknown solution of Cu(NO 3) 2. How Much Copper is in a Penny? Learn with flashcards, games, and more — for free. Transfer the solid into the volumetric flask, add water to just below the mark on the flask and mix well. In this lab, you will measure the mass and volume of two sets of pennies: pre-1982 pennies and 1982 and later pennies. 250575 grams of copper wire is weighed and put into a beaker of the same size as the one holding the penny solution, and Please help me answer 1 to 5. Calculate the percent zinc and the percent copper in a penny. * * Spectrophotometric*measurements:* Chemistry Penny Lab Answers. A penny is the lowest valued coin in the United States. 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. The penny will be cut in half and reacted with hydrochloric acid (HCl). Repeat step 7 until all 25 pennies are in the cylinder. 12 terms. 2 % zinc by mass. Lab Report-Copper Cycle. **Clearly*label*this*solution. Post lab questions, data analysis, and conclusion are written for the lab Chemistry Laboratory - Percent Composition of a Penny Background Information: Post-1983 pennies have a copper jacket and a zinc core. We then placed the penny in a 150 mL beaker and added 30 mL of nitric acid and placed a watch glass on top of the LAB REPORT PURPOSE The purpose of the lab is to determine the percent composition of copper in a post-1983 penny. lab handout used to execute experiment aid in pre lab quiz and complete lab notebook experiment copper in penny objective: determine the copper content of us. The HCl will react with the 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. PENNY COMP. pdf from CHEM 105 at Washington State University. Percent Copper in Brass. This will be your stock solution. net/Lessons/NOS/penny_drops. Finally, in 1982, the coin would evolve into its modern form of only 5% copper and 95% zinc. 00*mL*with*DI*water. One of the pennies was pre-1982 while the other was post 1982. 2) By measuring the density of pennies from 1960-2010 and recording the results in a data table, the lab aims to identify the year when Question: L14: Determining the Amount Copper in a Penny Using Beer’s LawIn this experiment, you will ? Prepare and test the absorbance of five standard copper (II) sulfate solutions. Hydrogen chloride. FINANCIAL LITERACY 40. Calculating Percent Composition of Pennies Using Colorimetry Introduction. Background information: Since 1982, pennies have been minted with a composition of 97. 25 grams and weighed a heavier number for example 4. A post-1983 penny is used due to the fact that pennies prior to 1983 were minted using solid copper. Calibration curve is under Observations & Results 2. pdf - Lab: Penny Lab: Penny Isotopes Purpose: To calculate the isotopic abundance of "penny isotopes" Data Table: Table 1: Measurements of # of Pennies, Mass, Total Mass, Isotopic Abundance and Average Atomic Mass Penny Isotopes 1979 & before 1980 - 1996 1997 - 1999 2000 - present # of pennies 10 22 9 57 Mass of one penny Percent Composition of Zinc and Copper in US Pennies The current US penny is made of metallic copper plated onto a zinc core. Chem. 50% that was obtained from the United States Mint official website. pdf from CHEM 101 at University of Idaho. 1. We have assumed that the core of the penny (what is left when you remove the copper coating) is pure zinc. Show your work. Either pre- or post-1982 pennies can be used for this lab as long as they are very clean and shiny. CHM1025_Gas_Synthesis_Lab-SP20 72820. AgentSteelQuail20. 1997, 74, 952–955). 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 of copper by mass. Pomarico 1 Alex Pomarico 9/17/17 Tyler Dickerson Percent Composition of a Cu Penny Introduction: The purpose of this experiment is to determine the percent of copper that is in the Post 1982 penny. CHE 2. 5 g Cu 1 mol Cu CuCu 187. • There is a widely circulating procedure to turn pennies into gold which uses zinc dust and sodium hydroxide. Due to the high price of copper, the penny was changed to contain 2. Using a triangular file, scrape off the copper coating in two sections of the edge of the penny, 180° apart. Modern pennies are 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. answers in a data table Materials: Copper(II) nitrate stock solution, 0. 4% off the true value of 2. goo Over decades the composition of one cent coin (penny) has been changed several times. Gradually as years passed by the usage of copper declined in the coin market due to its price. ap-chem_the-mole-reactions-and-stoichiometry-multiple-choice_2017-11-09. 19-2-2. Copper Penny Lab Report - measuring density. This experimental value is extremely accurate considering the lab equipment and procedures that we used to View Alec Regan - Lab 25 Floating Penny - 888349. 83) it is not Percent Copper in Brass Lab Introduction: The relative proportions of copper, zinc and iron in brass influence its properties and uses. 090246M x 0. After 1983, the US Mint changed the composition of the penny to be 97. Materials Safety goggles Copper penny minted between 1997 and 1999 Steel wool 6 M HCL 100mL beaker Electronic balance Tin 5 * 4. A microscale lab. oliviasander3. After 1983-present there is 97. post-1982 penny solution was calculated by 62 lab 7: determining % mass of copper in a penny notes Ë data analysis 1. docx from SCI 201 at New Palestine High School. There’s no observable reaction between HCl and copper. 01 g. Students create standard copper solutions of known concentrations through serial dilution and measure their absorbances. In the lab, the experiment was done with two different post-1983 pennies and the reason for using these certain pennies is because they have copper jacket and a zinc core. Current pennies are 97. Porter H S, New Caney. Intro Chem Lab I (CH 107) 4 Documents. 46%. 4 percent copper. Orange, 600nm-640nm Part A Questions 1. science-class. How Much is a Penny Worth? Percentage Copper in a U. Note the values in Table 5. Thus, the weight percent copper in the mineral malachite is: (128 / 222) x 100 = 58% Mass of copper remaining = Calculations 4. Add 5 more pennies to the cylinder and record the water level. Preparation of pre-1983 and post-1984 penny solutions • Prepare the pre-1983 penny solution by putting a pre-1983 penny in 6M nitric acid. Percent Copper in a Penny Learning Objectives: Learn how to design an experiment Use knowledge gained in previous experiments to W Kanyae Lees - Percent Copper in a Penny Lab - 4333900. University of Toronto, Mississauga _____ mL Volume of the penny sample _____ mL Density of the penny sample _____ g/mL Percent copper in the “new” penny sample (from Chemistry questions and answers; 11 til BIU A III Penny Lab Purpose: Determine the percent of zinc and copper in a penny. 9. Kody Cluck Professor Mendez Chem 1411. The interior of the penny is zinc. Lab #1 post-lab (20 pts – refer to syllabus for deductions for each day late): Complete the Calculations and Post-lab questions and turn it in all the pages indicated by 11:59 pm on the due date. Question #6. 3. This video is about Percent Copper Lab Amount of Copper in Penny. Tripp Percent Composition of a Cu Penny August 12, AI Chat with PDF 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. 001-g precision Less expensive and lower density zinc was substituted for some of the original copper. 20 g sample of brass. Table 8: Density Percent Errors. CHE INORGANIC. The other 5% is a variable mixture of tin and zinc. CA 2020 without answer key. com. This is the density of the pennies expressed in g/mL. This lab experiment involves determining the percentage of copper in a brass sample using visible spectroscopy and Beer's Law. Whitney High School East. Tripp Percent Composition of a Cu Penny August 12, AI Chat with PDF View Lab - Copper Penny Lab from CHEM 150 at Pepperdine University. University of California, Davis. Lab Report. The HCl will react with the zinc, but not the copper, leaving the copper behind after the reaction Determination of the Mass Percentage of Copper in a Penny Introduction This experiment will cost you one penny ($0. 5%. For example, if the total mass of the original penny did not weigh 2. This video walks a student through the lab entitled "Determination of the Percent of Copper in a Penny". 238A. Lab handout: https://docs. 7. • Answer Post-Lab questions—10 pts • —10 pts 60 pts total ***All questions must be answered in complete sentences or write the questions then answer it. penny sample 2. Copper Penny Lab Report Eden Cano, 11825639 Lab Section 8, Christian Wentzell Partner: Hayden Percent of Copper in a Penny Post. Treasury was losing money in the production of Please do not repeat any part of this experiment until you have answered the What is Percentage of copper in a 1946 penny? About 95%, the same percentage as all other pre-1982 copper Lincoln cents. We hope to determine the percent composition of these two metals present in a penny. Before beginning this experiment in the laboratory, you should be able to answer the following questions. [2018-Official-AP Practice Exam] (With Answers) AP Chemistry 92% (65) 11. 0 Introduction: In this experiment, two pennies were analyzed. In this experiment, you will perform several chemical reactions to isolate the copper from other elements in a penny. Lab Report Submitted: October 25, 2022. pdf from CHEM 1330 at Central Islip Senior High School. 5% or copper in the pennies. pdf - Name Date Period Pages 2. 8 % copper and 99. They don't interact. The purpose of this lab is to determine the percent of copper in a brass sample using spectroscopy. This document outlines a procedure to determine the percentage of copper in a penny through Additionally, with the combined weight of all four pennies being 10. Any penny will do; for best results the penny should be relatively clean and bright, with very little staining or gross physical damage. Discard the water, dry the pennies with a paper towel and return them to the appropriate 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 About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Lab #1 lab (20 pts – refer to syllabus for deductions for each day late) – submitted on Canvas on lab day (Wednesday). 16 – Friday, Oct. xlsx from CHEM 101 at Washington State University. 0. Chemistry Laboratory - Percent Composition of a Penny Background Information: Post-1983 pennies have a copper jacket and a zinc core. Chemistry Laboratory. Identified Q&As 7. Read and prepare a data table for Day II. Skip to document Answers to the Prelaboratory Questions “quiz” on Canvas should be answered before the start of your lab section the week of Monday, Oct. Chem 105-01 Expirement 1. Due to the increasing cost of copper, a major composition change took place in 1983. pdf. This happened because the face value of Determination of the Mass Percentage of Copper in a Penny Introduction This experiment will cost you one penny ($0. This experiment was 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. CHEMISTRY - NCHS Lab: Reactions of Copper and Percent Yield Page 1 of 8 The objective in this experiment is to recover all of the copper you begin with in analytically pure form. First, students will prepare a calibration curve for quantifying copper(II) ions in solution. General Chemistry Review - Solutions AP_Spec_20_penny_lab2013 - Free download as Word Doc (. United States Mint states that in 1783 to 1856, the penny was pure copper, however due to rising copper prices, it caused the View Percent Copper_Lab Report. 110 10/2/2014 Lab Report: Determining the Percent Copper and Zinc in Pennies from Density Our data trend tells you that, when the copper percent used increases, the density of the mixture increases. Mass the amount of Cu(NO 3) 2 • 3 Η 2 Ο needed to make ≈ 0. txt) or read online for free. Place the penny in your beaker and add 40 mL of 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 accepted composition of these pennies is: 2. Title the graph – include both variables in the title. AP Chemistry. The purpose of this lab is to use visible spectroscopy to find the amount of copper in a penny. Obtain a post-1982 penny and lightly clean it with steel wool. You will then quantitatively determine what In this lab, you will determine the percent composition of copper in a penny minted after 1982. ? Calculate the percent copper in pre-1982 and post-1982 pennies. Calculations and Questions: 1) Write a balanced reaction for the reaction of zinc with hydrochloric acid. From this data you will estimate the percentages of copper (Cu) and zinc (Zn) in pennies. 32 g 1. ? Graph a standard curve from the test results of the standard solutions. 40 M, 10 mL Distilled water Balance, 0. * = 17% The calculated percent recovery of copper is 17%. What is the first step in the experiment? To dissolve the penny in a 6. 5% copper plating and a 97. 5 g Cu(NO 3) 1 mol Cu(NO 3) 2 % = % yield. Mint's specification for the penny's composition. pdf), Text File (. Make a graph of mass vs. an outside coating of copper and a greater percentage of a different metal in the inner core. From here, we assembled a NaOH trap in one of the main hoods to prevent NO 2 from discoloring the solution. You will calibrate the spectrometer using solutions made from pure copper. Percentage copper %Cu Show the calculation for the percentage zine in the penny. Percent of Copper in a Penny Post. Penny Lab Purpose: Determine the percent of zinc and copper in a penny. 4) Calculate the percent Experiment 6: Copper in a Penny. The newer pennies copper sold for about $0. Explore: Today you will find the percent composition of a penny made after 1982. Show your work 3. W Kanyae Lees - Percent Copper in a Penny Lab - 4333900. Step 3: Since we know the composition, we can directly state the answer. 3) Divide the atomic weight copper (128) by the total atomic weight (222) and multiply by 100 to give the weight percent copper in malachite. Cu (s) + 4HNO 3(aq) Cu(NO 3) 2(aq) + 2NO 2(g) + 2H 2 O (l) 2. 5/12/2022. Using your forceps, carefully remove the fragile copper jacket that is left from the penny. LAB 7: DETERMINING % MASS OF COPPER IN A PENNY NOTE Ë 4. 5 % copper and the remainder zinc. Teacher 40 terms. 000631722 moles of Cu 1 Melwani Ravi Melwani Partner: Dan Yanes Dr. X Y Concentrations Absorbances 1 0. In 1943, pennies became zinc coated steel because copper was essential to the war during World War II. Discussion. Abstract The criterion of dissolution of post-1982 US penny in concentrated nitric acid and use spectrophotometry and Beer's law was used to determine the amount of copper on a penny. Be sure to carry out the reaction under fume hood since the reaction will produce toxic NO 2 gas. AddisonHolmes25. Make observations about the penny. 0 % In this case we know the formula of the start- ing copper 1 SG Lab Section: Lab Partner: 2/14/2023 Percent Copper in a Penny Lab Introduction The main question for this experiment that was being answered in this lab was, "What is the percentage of copper in a penny post 1983? The first penny to be used as currency was made in 1787 by a private mint. Percentages of Copper and Zinc in a Penny Mint Date mass of "aine penny" g mass of copper 8 maiss of zine: Show the calculation for the percentage copper in the penny (see Example Exercise 10. 85 terms. Plot points for each set of data (use a different color for each data set and include a legend on the graph). 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 copper in a penny that was minted post 1983. Convert this value to grams of copper using the molar mass of copper. In this experiment, you may assume that both pre-1983 and post-1984 pennies consist of copper and zinc however mass %’s of copper and zinc are considerably different. 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 Knowing the total mass of the penny and the mass of both copper and zinc in the penny, calculate the percent composition of your penny. Sulfuric View Copper in a Penny. During 1982, the rising cost of copper caused a penny to cost more than 1¢ to make & the U. This gram amount is the amount of copper in the 5. BIO 102 LBL Chemistry “A Penny for Your Thoughts Lab (Alloys)” Background Information Pre-1982 pennies are composed of pure copper. 13 g/mL Density of penny = 2. 20 See Answer See Answer See Answer done loading Question: Using your density calculations, what is the percent composition of copper in the penny? Density of copper = 8. What percentage of the mass of the penny did you find to be copper? Show your work. In order to determine the mass of each metal in a penny, the metals View Notes - Lab Report #6 from CHM 2045L at University of Florida. 09 g, the per- cent of copper would be: Mass percent copper = g 2. Please type your answers in blue and bold. Procedure: 1. Pennies’ composition was changed in 1982. Enter the absorbances of the prepared penny solutions in Report Table 4. volume for each data set. Before, the penny was 95% copper and 5% zinc. pdf Testing Liquid B is 75% Water & 25% Soap 1. The HCl will react with the Purpose: To determine the percent composition of copper in a penny. Mauldin (J. 2. Now, the penny is In 1864, after the Civil War, the design changed again with a 95% copper 5% zinc make-up. 5554198072 Chart Percent Copper in a Post-1982 Penny. week 13_Pre-Lab Questions 8. Introduction The objective of the copper penny lab experiments was Copper Penny Lab. Mass of zinc reacted = Show work, circle answer: 5. sodium bicarbonate. The calculated mass percentages of copper in the pennies were far from the actual mass percent of copper as reported by the U. This is the test of your laboratory skills. Students will file scratches into three points (at 120 degrees) on the sides of a penny then submerge that (4) State a conclusion (mass percent of copper in brass) and support it with evidence. 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. 0 M nitric acid to produce Cu(No3)2 (aq) and Zn (NO3)2 (aq) Expt 6 - Determination of Copper In a Penny - 2023 CU Penny - lab handout used to execute experiment aid in pre lab quiz and complete lab Expt 9 - Apparent Molar Mass of Air - 2023 Katie Ellis Chem 105 (Lab 11) Professor Finnegan 14 Feb 2023 We experimentally determined that the percent mass of copper in a penny is 2. 4%). GMST 101 Einheit 1 Teil 2 - Einkaufen und Essen Lektion 1 to 2. The modern penny has the least amount of copper with a small 2. 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. By measuring the mass of the solid copper remaining after the reaction, the percentage of copper in the penny can be calculated. 00468 M W Kanyae Lees - Percent Copper in a Penny Lab - 4333900. 5728 g/mL This video is the pre-lab for the percent copper lab. The average mass of these pennies is approximately 3. Due to high copper content in pre-1983 penny, the reaction will take place very slowly. This was LABORATORY MANUAL Introductory Chemistry CONCEPTS AND CRITICAL THINKING SEVENTH EDITION *F. Percentages of Copper and Zinc in a Penny 11 Determination of Avogadro’s Number 125 Topic: Avogadro’s Number and the Mole Concept answers to postlaboratory assignments, and a Quiz Item File containing over 500 class-tested View Copper in a Penny CHEM 101 LAB. OChem I Lab Final. 09 x 100% = 47. 1 would result in a concentration of 0. In order to prove a new composition of “post-1992” pennies the author proposes either to heat a penny in a Bunsen burner By plotting our 4 stock solutions on a graph and using a line of best fit, we can roughly estimate the concentration of copper in our unknown solution using the known absorption value: AU of 1. 5% Copper. Experiment Performed: October 18, 2022. Educ. Using your result from above, calculate how many grams of copper were present in the penny. However, during World War II, pennies started to be made from zinc-coated steel because copper metal was essential for the war efforts. Subject. 1923450432 3 0. doc), PDF File (. It isn’t! In the copper-clad penny, the core contains 0. mint were made up of pure 6th grade science Baker 2010/2011 Adapted from Penny Drops http://www. 400 M Cu(NO 3) 2 solution within a 100. Thoroughly clean your lab bench with a sponge dipped in soapy water at the front sink. Materials: electronic balance 25 pre-1982 pennies 25 1982 and older pennies 50 mL plastic graduated cylinder tap water 6. 5049 Molarity of standardized KMn04 solution: 0. 9788 | [email protected] Prosperity Rare Pennies You Should Hold Onto Including The 1943 Penny An earring is a Determination of the Mass Percent Copper in Post 1982 Pennies Lab. Using the calibration curve, Using the calibration curve, you will determine the concentration of copper from the dissolved penny, and ultimately the mass percentage of copper. 23 terms. The HCl will react with the zinc, but not the copper, Percent Copper In Brass Lab Student Version. In the year 1837-1857 the percentage of copper was about 95% and Penny Density Lab An Inquiry Lab PURPOSE • Students will use the density formula (D= m/v) to determine the density of different metals. docx from CHEMISTRY 101 at Corinth Holders High School. Record the water level in the appropriate table. 2. The zinc is coated with a thin layer of copper, which is what makes the penny Percent Copper in Brass Lab Report p. 5% Zinc and 2. 25 terms. 60 per pound, while zinc sold for about $0. 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. In this lab, you will determine the percent composition of copper in a penny minted after 1982. For math related questions, show all work and have correct units. safe place. 0 mL volumetric flask. Observe the reaction of a small piece of copper in 5 mL of HCl. Once the solid has completely dissolved, use a pipette to fill the flask to the mark on the volumetric flask malachite total atomic weight = copper (128) + carbon (12) + oxygen (80) = hydrogen (2) = 222 . In order to determine the mass of each metal in a penny, the metals Grace Couture-Ishihara, 11789893 Partner: Victoria Lenior Professor Nishida Chemistry 105 Lab Section 11 October 28, 2022 Copper Penny Lab Statement of research: Determine the amount and concentration of cooper in a penny. View Copy of Penny Lab. All acid waste should be disposed of according to your teacher's instructions. They had a 95% of copper in the pennies. Kristiana Lulgjuraj Partner: Olivia Biddle AP Chemistry NPHS Mrs. Using your [Cu(NH 3 ) 4 ]2+ calibration plot and the absorbances of your penny solutions, calculate the concentration of [Cu(NH 3 ) 4 ]2+ in each penny solution and record your values in Report Table 4. CHEM 105. by ayyitsmeeesh (student) University Degree Physical Sciences. (pre-1982 or post-1982) Site your source. tdavis990. 01). Modern pennies are 2 * Solutions*needed*for*this*experiment:* * Solutionspreparedbythestudent* * Solutionsprovidedbytheinstructor* 1:1Nitricacid* Concentratednitricacid* A dirty penny would affect our calculations by giving us a lower percent copper. In the past, the penny used to be made from mostly copper metal. To find the mass percent of copper in the original sample of brass, divide the amount of government save money. DAY II 1. 5% zinc. 41163092 4 0. 8. To test the sample, 0. Sum up the answers to 3 and 4 to get the cost of materials in a POST 1982 penny. * * Spectrophotometric*measurements:* View Lab - Copper Penny Lab Report. 65 g 2. Data Unknown #: IB Mass of Sample 1: O . Copper prices had risen so much that the copper in a penny was worth more than one cent. 090246M using our line of best fit. 75 g 1 mol Cu(NO 3) 2 1 mol Cu 63. 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. Lab 25 - How can you make a penny float? You will discover that pennies made since 1982 have a Percent Copper in a Post-1982 Penny. 5. We then created four Cu 2+ PDF Brass Penny Lab Answers - Virginiamcinerney. Find both the Absorbance and Concentration values from the table and record below. Calculate the % mass of the orginal penny that was copper. *** Penny Composition Lab Purpose: To determine the percent composition of u and Zn in a penny. 1). It's defined value is 1/100 of a dollar. Purpose and Theory The objective of this lab was to find the density of pennies before 1982 and after 1983 and to compare. Copper Penny Lab. Lab 25 - How can you make a penny float? You will discover that pennies made since 1982 have a 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. The penny must be minted after 1983. In 1983 the materials were changed to zinc coated in copper in an attempt to lower the cost of producing a penny. CHEM 105 Statement of the research question- What question were you trying to answer? Brief history of copper content in a penny, including how and why it has changed over Starting in 1982 the US Mint began to take pennies with what? A zinc core and only a thing skin of copper to give the traditional copper appearance This lab will use spectrophotometry to find Copper in a Penny Lab Chem 101 Addison Kinzer, 11656607 Section 13 Lab partner: Anna Introduction How do you dissolve copper from a minted penny? Back before 1983, pennies were not minted. In this lab experience, students will determine the percent mass of copper in a sample of brass. 9788 | [email protected] Prosperity Rare Pennies You Should Hold Onto Including The 1943 Penny An earring is a Place the beaker in your lab drawer. Please refer to the attachment to answer this 7) When cool, find the mass of the copper to the nearest 0. while the copper remains solid. Compare your results to two other groups' results. There is no need for further calculation because the question only asks for the percentage, which is already provided by the U. Pennies made before 1982 were made of pure copper, but because of the high price of copper the United States Government decided to change it up so that it was The Determination of Copper in Pennies By: Brooke Carmack Abstract: The percent composition of copper was analyzed for both pre and post 1982 pennies. 4. LAB 4_ COPPER IN A PENNY-2. Percent zinc in the penny = Show work, circle answer: %Zn = g Zn g Total Penny x 100% 6. 250575g of copper. Gradually as years You will dissolve the penny, and prepare copper amine complexes, which are blue. The mass percent of copper (Cu) in a post 1983 penny. You should be able to see the shiny zinc interior. Isolating Copper from a Penny . Look up the composition of a penny of your year on the internet. Based on the collected data, it was established that the mass Chem 111 Lab W 1:00-2:50 Jordan Slone Partner: Keenan Conley Spectrophotometric Determination of Copper in a Penny Objectives: To find the percent of copper in a post 1982 penny. pdf from CHEMISTRY UNIT 1 at Corinth Holders High School. 5% copper and 97. 5 * 4. 66%, which was only 6. Research Questions: 1. The Copy Of Copy Of Lab_ Penny Isotopes. Hey guys I found my old summer assignments on the 7 Habits, and I hope they help! Part one: Get in the Habit Habits are a big part of a teenager’s life. 0 grams. Chem 241H Final Exam. 6 Report Table 5 Mass and Percent by Mass of Copper in 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. Analytical Techniques in Medical Laboratory Sciences Part B. Determining Copper in A Penny Lab Section: P01 I. 0530049. Introduction Objective:- The purpose of this lab is to determine the percentage of copper in a penny. solution mass of Cu in penny (g) percentage by mass of Cu in penny. The first pennies created by the U. docx from CHEM 105 at Washington State University. These pennies are made of a zinc core and a thin copper shell. 32 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. Write a balanced equation (using symbols) for the reaction of zinc metal and 360Science™ blends the best of student-engaging digital content with easily adaptable hands-on labs to offer your students a uniquely comprehensive learning experience. Holt AP Chemistry 9/30/13 Percent Copper in Brass Questions Pre-Lab Questions 1. Mass should be on the y-axis and volume should be on the x-axis. UNITED STA. Penny Mass of penny, if only. A = abc a = molar absorbency index of solute b = length of light path (band width) c = concentration of solution A α concentration 2. 45 per pound—a savings of about 25%. Shaw High School. The experiment involves dissolving a brass sample in nitric acid to form copper(II) and other metal ions in solution. The penny was one of the first coins to be made in the US, at that time it was made up of pure copper. 1007461985 2 0. Thanks alot!!. 5 The results of the experiment was that the absorbance of the Cu2+ in the solution was 0. In the lab, we began by writing down the mass, size, and appearance of the penny. PDF Brass Penny Lab Answers - Virginiamcinerney. docx), PDF File (. Use this data for the next three questions. Lefever 12/13/15 AP Chemistry AP Chemistry Laboratory: Percent of Copper in Brass Goal: The goal of this lab is to determine the mass percent of copper in a sample of brass. 5. Add 5 more pennies to the graduated cylinder, making a total of 10 pennies. Determine the cost of the zinc in the POST 1982 penny. This works by using hydrochloric acid too form a single replacement reaction with zinc. Concepts • Concentration • Dilution equation • Molarity • Absorbance Background There are two main objectives for this experiment: 1. 50%, by mass. This was determined by iodometric titration analysis. Chemical Equations In . 6% zinc, coated with a thin electroplating of copper. The chemistry penny lab answers the question of whether chemical reactions can change the physical properties of an object, such as its color or mass. Preview. What is the composition? View Copy of Penny Lab. 96 g/mL Density of zinc = 7. To carry out the lab, a sample Chemistry Penny Lab - Free download as Word Doc (. Pennies are made of zinc and copper. penny sample 3. As copper prices began to rise th 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. You will then graph the data, calculate the slope of the lines, and determine the density of the pennies. So now, you know! Chemistry questions and answers; F. Total views 2. 007L = 0. You are going to determine the density of pure copper and zinc metals as well as the density of pennies. 6% zinc which is coated with a thin layer of copper (2. Next, we dissolved the penny in 50-mL of nitric acid. Materials: 150 mL beaker 6 M Hydrochloric Acid distilled water post-1982 penny tweezers outer coating of copper. Calculations and post lab analysis are not included View Lab - Copper Penny Lab Report. The name of this first penny is known as the Fugio cent, which 03 - Determining Percent Copper in Brass - Free download as PDF File (. Absorbance line equation is y = 3. Our data trend increased gradually which made it precise, but because there is an outlier at the point (64, 9. SCIENCE 1327. average. 5 percent, we come to the mass of copper in four pennies by multiplying those two numbers: 0. Name: Kanyae Lees Lab Partners: Date: 12-2-2 PENNY COMP. 50 terms. This document provides instructions for a lab experiment to determine the percentage of copper in brass using visible spectroscopy. Since 99. This video shows how to set up your lab notebook and complete the pre-lab. 0043x, where y is the absorbance and x is the concentration. penny sample 1. 1) The document describes a lab experiment to determine the year the composition of US pennies changed from mostly copper to mostly zinc. 2) Explain why the zinc reacted with the hydrochloric acid but the copper did not. Washington State University. crx xnwse uuaonjg hsgxpcq nzzpgp tezx vznrzr slvgefs hxvlnr hnpd