Please list an example of a physical change and an example of a chemical change.
Example of a physical change: Melting of ice: When ice, which is a solid, is heated, it undergoes a physical change and transforms into water, which is a liquid. In this change, the substance itself remains the same, only its physical state is altered.
Example of a chemical change: Combustion of wood: When wood is burned, it undergoes a chemical change and transforms into ash and smoke. The process of combustion involves a chemical reaction between the oxygen in the air and the wood, resulting in the production of heat, light, and new chemical compounds. The original substance (wood) is completely transformed into different substances (ash and smoke), which cannot be easily converted back into wood.