boiling water and melting wax rusting iron and baking a cake dissolving powder and shredding paper freezing water and burning coal
I gave my students this multiple choice question: Which shows one example of a physical change and one example of a chemical change?

Only one answer is correct among these 4 choices:
- boiling water and melting wax
- rusting iron and baking a cake
- dissolving powder and shredding paper
- freezing water and burning coal

Could you tell me which one is correct?

freezing water and burning coal