Which of the following is an example of a chemical change?

A chemical change, also known as a chemical reaction, involves the rearrangement of atoms and the formation of new substances with different properties. Burning wood is a classic example. The wood reacts with oxygen in the air, resulting in the formation of ash, smoke (gases), and heat. These new substances are completely different from the original wood and cannot be easily converted back to wood. In contrast, melting ice, dissolving sugar in water, and boiling water are all examples of physical changes. Physical changes affect the form or appearance of a substance but do not alter its chemical composition. For example, when ice melts, it changes from solid to liquid water, but it's still H₂O.