Question

Ash is still present after a bonfire. is this a chemical change or physical

Answer 1

The presence of ash after a bonfire indicates a chemical change. During the bonfire, the wood (or other materials) undergoes combustion, which is a chemical reaction that transforms the original substances into new products, including ash, smoke, gases, and heat. The chemical composition of the original material is altered in this process, which is characteristic of a chemical change. In contrast, a physical change would involve a change in state or appearance without altering the chemical composition of a substance.