Question

1. which is an example of a chemical change? water boiling a cake baking butter melting sugar dissolving

Explanation:

A chemical change results in the formation of new substances. When water boils, it changes from liquid to gas (water vapor), but it is still \(H_2O\), so it is a physical change. When butter melts, it changes from solid to liquid, but its chemical composition remains the same, so it is a physical change. When sugar dissolves in water, it forms a sugar - water solution, but no new substances are formed (it can be recovered by evaporation), so it is a physical change. When a cake bakes, ingredients like flour, eggs, etc., undergo chemical reactions (e.g., Maillard reactions, protein denaturation, starch gelatinization) to form new substances (the baked cake with a different texture, taste, and chemical composition compared to the raw ingredients).

Answer:

a cake baking