The density of Pre-1982 penny is about 8.9 g/cm^3--do you think it is a physical change or a chemical change?

Please briefly explain why it is a physical or chemical change?

What is the change?
I can't answer your question as I do not know if a post-1982 penny has a different density. However if all elements in a penny or equal then the density change would be a physical one.
Neither; it is a mechanical change, because the Mint started using zinc instead of copper for the innards of pennies. Obviously, there was no chemical reaction involved, nor physical change either.

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