Question

name two chemical changes which can be reversed

Answer 1

Because chemical changes produce new substances, they often cannot be undone. For example, you can't change ashes from burning logs back into wood. Some chemical changes can be reversed, but only by otherchemical changes. For example, to undo tarnish on copper pennies, you can place them in vinegar.



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Answer 2

When you burn a piece of paper, it turns to ash. It cannot become paper again. Your height cannot decrease. These are irreversible changes. They cannot be reversed at all.