Asubstance did not change its chemical nature in a reaction. which most likely describes the reaction? a) it was heated. b) it was hit with a hammer. c) it was placed in a salt solution. d) it was frozen.

The correct answer is D

It was frozen.

Explanation:

A substance may undergo any chemical change in its nature in all the given cases except when it is frozen.

A) during heating there is chances that it undergoes decomposition . Like if calcium carbonate is heated it converts to calcium oxide and carbon dioxide.

B) When a compound is hit with a hammer there is chance of its chemical decomposition.

C) If a compound is placed in a salt solution it may react with the salt or water.

D) However freezing is purely a physical process, where contact with any other compound or any chance of chemical decomposition is not possible.