Which of these is NOT a type of evidence for a chemical change?

A change in temperature can indeed indicate a chemical change, but it is not a definitive form of evidence on its own. Typically, a temperature change occurs in both chemical and physical changes. For example, when ice melts into water, the temperature changes, but this is a physical change, not a chemical one. In contrast, the other types of evidence listed—such as a change in color, production of gas, and formation of a precipitate—are more directly associated with chemical changes.

When a change in color occurs, it often signifies that a chemical reaction has taken place, as new substances are formed. Similarly, the production of gas during a reaction is a clear indicator of new substances being formed, often observable as bubbling or fizzing. Lastly, the formation of a precipitate, which is a solid that forms from a reaction between two liquids, is a strong sign of a chemical change. These evidences are key indicators that point toward a chemical transformation taking place, whereas a temperature change alone doesn't provide conclusive evidence of such a reaction.