Question

list evidence that can be used to identify if a chemical reaction has occurred.

Explanation:

Chemical reactions often show distinct signs. A color change indicates new substances (products) with different properties. Gas evolution (bubbles) means a gaseous product forms. Precipitation (solid formation in solution) shows an insoluble product. Temperature change (exothermic - heat release or endothermic - heat absorption) implies energy transfer as bonds break and form. Light emission (like in combustion) is another sign of a chemical change.

Answer:

Color change, gas evolution, precipitation, temperature change, light emission.