Question

what are some chemical changes that can be reversed back​

Answer 1

Answer:

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 other chemical changes. For example, to undo tarnish on copper pennies, you can place them in vinegar.

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Answer 2

Answer:

One example of a reversible reaction is the reaction of hydrogen gas and iodine vapor to from hydrogen iodide.