Question

A substance did not change its chemical nature in a reaction. Which most likely describes the reaction?

Answer 1

Answer: Option (D) is the correct answer.

Explanation:

• A reaction in which there occurs no change in chemical composition of a substance is known as a physical change or physical reaction.

For example, freezing of water is a physical change because only change in state is taking place.

A physical change never leads to the formation of a new substance.

• On the other hand, a change which brings change in chemical composition of a substance is known as a chemical change.

For example, $NaCl + H_{2}O \rightarrow NaOH + HCl$

A chemical change will always lead to the formation of a new compound.

Thus, we can conclude that it was frozen most likely describes the reaction.

Answer 2

B. It was hit with a hammer.