Well theres the kagiggers in the solution used are really hungery, and the dirt is actually not dirt at all but tiny microscopic organisms called crab people. Now these crab people are strong willed and put up a fight so make sure to use enough solution to kill them all. After the last crab person is dead, the bodies lose their connection with this realm and explode. This tiny microscopic explosion then chips off the dirt, cleaning the penny.
DO NOT use semen because the semen will feed the crab people causing them to grow to huge sizes, as happened in the 1994 Arizona Frasiure.
Copper reacts with the oxidilized copper on the penny.
A copper penny builds up a layer of corrosion on its outsides. Probably copper oxide. The cleaning just dissolves the outer corrosion and leaves a new outer layer of copper. CuO + HNO3 --> Cu(NO3)2 + H2O ... the copper nitrate is dissolved in the acid solution and leaves 'clean' copper behind.
nothing!
The penny is made out of copper.
Cleaning a penny with vinegar and salt is a chemical change. The vinegar (acetic acid) reacts with the salt (sodium chloride) to form a chemical compound that removes the tarnish on the copper surface of the penny. This reaction changes the composition of the penny's surface, making it appear shiny and clean.
Copper
Copper pennies (95% copper, 5% zinc) weigh 3.11 grams. Modern zinc pennies (97.5% zinc, 2.5% copper) weigh 2.5 grams.
Acids typically clean a penny best because they can dissolve the tarnish (copper oxide) effectively. Bases, on the other hand, may not be as effective in cleaning pennies due to their different chemical reactions with copper oxide.
A penny.
PENNY
A 1993 penny is composed of 97.5% zinc and 2.5% copper. Therefore, the percentage of copper in a 1993 penny is 2.5%.
A 1983 penny is made of 95% copper and 5% zinc. The actual weight of copper in a 1983 penny is approximately 2.5 grams.