Question

which of the following describes why boiling water is a physical change? when you apply heat to water, it becomes steam, which is not a new substance with a different chemical makeup. when you apply heat to water, it becomes steam, which is a new substance with a different chemical makeup. when you apply heat to water, it becomes hydrogen and oxygen gas, which are new substances with a different chemical makeup. when you apply heat to water, it becomes hydrogen and oxygen gas, which are not new substances with a different chemical makeup.

Explanation:

Physical changes do not change the chemical composition of a substance. When water boils and turns to steam, it is still water (H₂O) chemically, just in a different state (gas instead of liquid). In a chemical change, new substances with different chemical makeup are formed. Water boiling is a phase - change (liquid to gas) and not a chemical reaction where hydrogen and oxygen gases are produced.

Answer:

When you apply heat to water, it becomes steam, which is not a new substance with a different chemical makeup.