List 3 examples of chemical changes
1. Rusting of iron: When iron is exposed to oxygen and moisture, it undergoes a chemical reaction that forms iron oxide, commonly known as rust. This is a chemical change as the composition of the iron is altered, forming a different substance.
2. Burning of wood: When wood is burned, it undergoes combustion, combining with oxygen to produce carbon dioxide, water vapor, and ash. This is a chemical change as the wood is being chemically transformed into different substances.
3. Digestion of food: When food is consumed and digested, it undergoes various chemical reactions in the body. Enzymes break down complex molecules into smaller molecules that can be absorbed by the body for energy and nutrition. This is a chemical change as the food is being chemically transformed into different substances to be utilized by the body.