View notes - lab 6 report from bsc 2011 at university of florida determining the mass percent of copper in a penny minted between 1982-2005 using colorimetry and beer's law introduction the. From 1944 to 1946, it contained 5 percent zinc and 95 percent copper from 1946 to 1962, it was made from zinc, tin and copper from 1962 to 1982, the combination of 5 percent zinc and 95 percent copper was used once again the year 2009 is important in the history of the penny. Experiment 8: penny statistics penny statistics, experiments to accompany exploring chemical analysis $a$12 and this is copied to b2. Determining the percent copper and zinc in pennies from density purpose: the penny costs 14 cents to manufacture each time at the mint. Watch video if the laws change and the mint decides to abolish the penny, people would be free to melt them down for the copper a penny saved, many times over. Here ‘s how to tell what a penny is made of — whether it’s a copper penny or a copper and, that 1:4 ratio of copper pennies to zinc lincoln cents seems to. The percentage of copper pennies in circulation varies geographically and seasonally, among other factors, but averages 20% – 25% nationwide, with some areas as high as 30% 2) you discarded the canadian pennies, but canadian pennies are copper up to and including 1996, and at 98% copper, they are in fact even more pure than us pennies. Shakudō is a japanese decorative alloy of copper containing a low percentage of gold 1,000μg of copper for 14-50-year-old pregnant females.
The canadian copper penny melt value calculator, located below, will help you find the total copper value and total copper content of your pre-1997 canadian copper cents. Each 25 dollar box of pennies has a typical composition of 80 percent post-1982 pennies and 20 percent pre-1982 copper pennies let's assume each pre-1982 copper penny is worth 2 cents and each post-1982 (and 1982 itself) non-copper penny is worth 1 cent (its face value) 20 percent of 25 dollars is 5 dollars. From 1864 to 1982, except for 1943, pennies were 95 percent copper this works out to 295 grams of copper in each cent the 1982 pennies were struck with both high and low copper alloysin 1943, pennies for circulation were struck from steel blanks and had no copper content. Pennies dated mid 1982 and older are known as copper pennies and contain 95% copper and 5% zinc note that pennies dated 1909 to 1958 are known as wheat cents and may contain a very small amount of tin (less than 1%.
Ap chemistry lab 4 1 using beer’s law to determine the mass percent of copper in an alloy purpose to determine the mass percent of copper in a penny definitions. 1 the word “penny” and its variations when the us mint struck its first one-cent coins—then the size of today’s half-dollars and 100-percent copper. Lab no_____ - percent composition of a cu penny objective – to determine the percent copper in a post 1982 penny use data collected to perform several stoichiometric calculations. Calculate the percent copper in penny up vote 0 down vote favorite i am working on an experiment where i used a spectrometer to create a calibration curve.
What is the percentage of copper in “copper” coins and the mass of the original coin to calculate the percentage of copper in your 1p piece evaluation. Topic 28404 how much zinc in pennies (2004) i am a student and i got an assignment form school to find out the percentage of zinc and copper in penny.
Cp chemistry theodore roosevelt high school lab #2-4 composition of a penny lab how much of a penny is copper percentage of your penny do you. Today, the penny in america is 25% copper with 975% zinc the copper coats the outside of the penny while the inner portion is zinc for comparison's sake, the penny in canada is 94% steel, 15% nickel, and 45% copper the percent composition of a penny may actually affect health, particularly the health of small children and pets. % copper in post-1982 pennies 1 the problem statement, all variables and given/known data the total mass of each penny is 2500g, the density of copper is 896g/ml, the density of zinc is 714g/ml and the mass of a penny if.
The alloy remained 95 percent copper and 5 percent zinc until 1982, when the composition was changed to 975 percent zinc and 25 percent copper (copper-plated zinc) cents of both compositions appeared in that year the penny's original design was suggested by ben franklin. Percent mass of copper in a penny introduction the purpose of this lab is to determine the percent mass of cu in a penny and see if the fabricator that makes the planchets for the government is using the correct amounts of cu in the pennies. Chemical reactions of copper and percent yield key pre-lab (review questions) 1 give an example, other than the ones listed in this.
Find out when the us switched to the copper-plated zinc penny, and how to tell if your penny is made of copper or zinc. A penny for your thoughts: scientific measurements to find out the percentage of copper and zinc in a us penny the percent copper of pennies from. • students will calculate the percent copper prices increased such that the price to mint a primarily copper penny properties of pennies teacher. 1 mole calculations how many moles, atoms in 305g copper penny mol cu = 305g cu (1 mol cu/ 635g cu) calculation of percent composition.