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CHS students perform penny experiment
Tests prove which coins are pure copper, which are alloyed with zinc coating
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By Calen McKinney, Public Information Officer
Campbellsville Independent Schools
Campbellsville High School chemistry students recently performed an experiment with pennies. CHS teacher Dee Doss asked students to determine whether their pennies were made of pure copper.
Students were given two pennies, one made before 1982 and the other made after 1982.
First, students created grooves in the pennies. Then, they placed the pennies in a beaker and soaked them in hydrochloric acid.
They observed any reactions happening and then let their pennies sit overnight.
In the end, based on the condition of their pennies, students learned that before 1982, pennies were made of pure copper. Afterward, pennies were made of copper with a zinc coating. - Calen McKinney
This story was posted on 2017-03-14 05:18:21
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