What is a kind of chemical change?

Answer 1

Burning wood is a chemical change because the chemical makeup changes through the addition of heat.

wood + heat = ash and other gases

Pretty much when one substance changes into another substance and the change is irreversible, it is a chemical change.

Answer 2

Rust forming on iron is a common example of a chemical change. In this process, iron reacts with oxygen in the air to form iron oxide, which has different properties than the original iron.