dissolving table salt in water hammering aluminum into thin sheets melting gold to make jewelry burning wood to produce ashes
I gave my students this multiple choice question: Which activity is an example of a chemical change?

Only one answer is correct among these 4 choices:
- dissolving table salt in water
- hammering aluminum into thin sheets
- melting gold to make jewelry
- burning wood to produce ashes

Could you tell me which one is correct?

burning wood to produce ashes