Question

1. which is an example of a chemical change?

water boiling
a cake baking
butter melting
sugar dissolving

Explanation:

A chemical change involves the formation of new substances. When water boils, it changes from liquid to gas (physical change). When butter melts, it changes from solid to liquid (physical change). When sugar dissolves, it forms a solution (physical change). When a cake bakes, new substances are formed due to chemical reactions (e.g., proteins denaturing, starches gelatinizing, etc.), so it is a chemical change.

Answer:

a cake baking