Water expands when it freezes. The boiling point of water is 100ºC. Water can separate into hydrogen and oxygen. The density of water is greater than the density of ice.
I gave my students this multiple choice question: Which fact about water is an example of a chemical property?

Only one answer is correct among these 4 choices:
- Water expands when it freezes.
- The boiling point of water is 100ºC.
- Water can separate into hydrogen and oxygen.
- The density of water is greater than the density of ice.

Could you tell me which one is correct?

Water can separate into hydrogen and oxygen.