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What must be done to be certain that a chemical change has taken place?

ACheck for the production of bubbles before and after the change.
BDemonstrate that a release of energy occurred after the change.
CCheck the composition of the sample before and after the change.
DDemonstrate that energy was absorbed by the reactants after the change.

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sarajevo

Answer:

c. Check the composition of the sample before and after the change.

Explanation:

In a chemical change there is change in the chemical composition. So the chemical composition of the reactants is different than the chemical composition of the products. During a chemical change the bonds in the reactants are broken and new bonds are formed in the products.

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