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Answers on questions: Biology
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Ответ:
The negatively charged oxygen atoms in our air are attracted to the positively charged copper atoms in the penny. When oxygen binds with copper, they form a new molecule known as copper oxide. This is why most pennies you see look dirty or tarnished, it's actually copper oxide. Silver will not oxidize as quickly, as it is not made of a material that negatively charged oxygen atoms are attracted to.
Ответ:
The answer is observation
Explanation:
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