The change in the wood is reversible. The energy in the wood is destroyed. The change in the wood is physical. The energy in the wood is transformed.
I gave my students this multiple choice question: Which of these is true when a piece of wood is completely burned in a fire?

Only one answer is correct among these 4 choices:
- The change in the wood is reversible.
- The energy in the wood is destroyed.
- The change in the wood is physical.
- The energy in the wood is transformed.

Could you tell me which one is correct?

The energy in the wood is transformed.