Identify each of the following as a physical or chemical change: (3.2)a. Aspirin tablets are broken in half.

A physical change involves a transformation that does not alter the chemical composition of a substance. Examples include changes in state, shape, or size, such as melting, freezing, or breaking. In the case of aspirin tablets being broken in half, the chemical structure of the aspirin remains unchanged, making it a physical change.

A chemical change results in the formation of one or more new substances with different chemical properties. This process often involves a chemical reaction, where bonds between atoms are broken and formed. Unlike physical changes, chemical changes are usually irreversible under normal conditions, such as burning or rusting.

To distinguish between physical and chemical changes, one can assess whether the substance's identity is altered. If the change can be reversed and the original substance can be recovered, it is likely a physical change. Conversely, if new substances are produced and the original cannot be easily restored, it indicates a chemical change.