* New substances are formed: The heat from striking the match causes a chemical reaction between the chemicals on the match head (phosphorus, potassium chlorate, sulfur, etc.) and the striking surface. This creates new substances, like phosphorus oxides, sulfur dioxide, and other combustion products. These are different from the original chemicals on the match head.

* Irreversible change: Once the match is struck, you can't easily reverse the process to get back the original materials.

* Energy is released: The burning match releases heat and light, indicating a chemical reaction that releases energy.

In contrast, a physical change doesn't create new substances. Examples of physical changes include melting ice, cutting paper, or dissolving sugar in water.