Question

what happens when a substance undergoes a physical change? some physical properties change, but the substance keeps its identity. no physical properties change, and the substance keeps its identity. some physical properties change, and the substance changes its identity. no physical properties change, but the substance changes its identity.

Explanation:

In a physical change, properties like state (solid - liquid - gas), shape, or size may change, but the chemical composition of the substance remains the same, so it keeps its identity.

Answer:

Some physical properties change, but the substance keeps its identity.