Nitrogen monoxide (N2O), also known as laughing gas, is a colorless, non-flammable gas that is slightly soluble in water. It is a stable molecule that does not react with most other substances at room temperature. However, when heated to a high temperature, N2O can decompose into nitrogen gas (N2) and oxygen gas (O2).

$$2N_2O \rightarrow 2N_2 + O_2$$

This decomposition reaction is a chemical change because it results in the formation of new substances with different properties than the original substance.