The example of a chemical change among the given options is baking a cake. Here's why:
1. Boiling water: Boiling water is a physical change where water changes its state from liquid to gas but its chemical composition remains the same.
2. Breaking glass: Breaking glass is a physical change as well because although the shape and size of the glass change, its chemical composition remains unchanged.
3. Baking a cake: Baking a cake involves a chemical change. During baking, the ingredients of the cake undergo chemical reactions, such as the eggs and flour combining to form a new substance with different properties - the cake itself.
4. Holding two magnets together: Holding two magnets together is a physical change as well. The magnets might attract or repel each other, but no new substances are formed through a chemical reaction.
