Can a chemical change be reversed easily?

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Solution

Chemical change:
A chemical change occurs when a substance(reactants) combines with another to form a new substance(Products).
Chemical change includes the making and breaking of bonds the new substance(Product) formed is more stable and therefore, the change cannot be reversed.
Example of Chemical change:
Zinc(Zn) and hydrochloric acid(HCl) react to form zinc chloride(ZnCl₂) and hydrogen gas(H₂) but zinc chloride doesn't react with hydrogen gas to form zinc and hydrochloric acid.
Therefore, a chemical change is permanent and irreversible.

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(c) physical change that cannot be reversed
(d) chemical change that cannot be reversed

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