Which change is chemical?

Question

1. Water boiling.
2. Water evaporates
3. Water going through electrolysis: Liquid becoming oxygen and hydrogen molecules.
4. Water freezing
I would say answer 3.

Answer 1

You are correct. The change that is a chemical change is 3. Water going through electrolysis: Liquid becoming oxygen and hydrogen molecules.

In this process, water (H2O) is broken down into its constituent elements: hydrogen (H2) and oxygen (O2), which involves a change in the chemical composition of the substance.

The other options (boiling, evaporating, and freezing) are all physical changes, where water changes its state (from liquid to gas or solid) but retains its chemical composition as H2O throughout those processes.