What is the main difference between physical and chemical changes? a. Chemical changes require a change in composition and physical does not b. Chemical changes do not require a change in composition but physical they do. c. Chemical changes are reversible d. None of the above

a. Chemical changes require a change in composition and physical does not

Explanation:

The main difference between physical and chemical changes is that chemical changes require a change in composition and physical does not.

A chemical change is the change in composition of a substance which is irreversible and a permanent change.

On the other hand, physical change is a temporary change in a substance and can be easily reversible. The composition of a substance do not change in physical composition.

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