Question

which statement best describes what happens during a chemical change?

both the identity and the properties of a substance change.

some properties of a substance change, but its identity remains the same.

the chemical properties of a substance change, but its physical properties remain the same.

the physical properties of a substance change, but its chemical properties remain the same.

Explanation:

A chemical change involves a transformation that alters the chemical composition of a substance. This means the identity of the substance changes. For example, when iron rusts (reacts with oxygen), it forms a new compound (iron oxide). In a chemical change, the chemical properties of the substance change. Physical properties (like state of matter, color in some cases) can also change. For instance, when wood burns (a chemical change), its physical form (from solid wood to ash, gas) changes. So during a chemical change, both the identity and properties (chemical and often physical) of a substance change.

Answer:

Both the identity and the properties of a substance change.