Question

What is true about water that is freezing? A) The change cannot be undone. B) It is going through a physical change. C) It is going through a chemical change. D) The chemical makeup of the water will not remain the same.

Answer 1

Answer: B) It is going through a physical change.

Step-by-step explanation:

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.

Example: Freezing of water

`H_2O(l)\rightleftharpoons H_2O(s)`

The solid water can be changed to liquid by heating or lowering the pressure.

The chemical make up of water remains same.

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.

Example: Corrosion of iron

`Fe\rightarrow Fe^(2+)+2e^-`

It can not be reversed.