Answered

Which processes represent one chemical change

and one physical change?

(1) freezing and melting

(2) freezing and vaporization

(3) decomposition and melting

(4) decomposition and combustion

Verified Answer :

SPNfan

I believe the answer is (3) since decomposition is a chemical change and melting is a physical change

Answer: (3) decomposition and melting

Explanation: Chemical change is one in which chemical composition of substance changes.

Physical change is one in which chemical composition of substance do not change.

Freezing is a process in which a liquid changes into solid phase when allowed to cool. Thus it is a physical change.

Melting : It is process in which a solid changes into liquid phase by providing heat. Thus it is a physical change.

Vaporization : It is process in which liquid changes into gaseous phase by providing heat. Thus it is a physical change.

Decomposition is a chemical reaction in which one substance decomposes to form two or more than two products. Thus the chemical composition change, and hence is a chemical change.

Combustion is a reaction in which a substance combines with oxygen gas to produce carbon dioxide, water and a lot of heat. Thus the chemical composition change, and hence is a chemical change.

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