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Burning a piece of paper in a fire describes a chemical change. When you burn a piece of paper, it undergoes a chemical reaction where the paper combines with oxygen in the air to produce new substances like ash, smoke, and gases. This process involves breaking and forming chemical bonds, resulting in a change in the composition of the paper.
Dipping a piece of paper into water, cutting a piece of paper in half, and writing on a piece of paper with a pencil are physical changes. Dipping the paper into water or cutting it doesn't alter the chemical composition of the paper; it only changes its physical appearance or form. Writing on the paper with a pencil is also a physical change as the graphite from the pencil is transferred onto the paper without altering its chemical makeup.
In summary, burning a piece of paper in a fire is an example of a chemical change because it involves a chemical reaction that results in the formation of new substances.
