Verified Answer :

The substance changes completely. It undergoes a chemical reaction. 

Example is when you bake a cake. You cannot bring it bake to dough.

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When a pure substance undergoes chemical change, the pure substance changes in chemical composition.

What is a chemical change?

Chemical change is any change that involves the formation of new substances or products and it is not easily reversible.

A pure substance is any substance that has a definite chemical composition.

However, when a pure substance undergoes chemical change, the chemical composition of the substance is changed to form new products.

Learn more about chemical change at: https://brainly.com/question/23693316

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