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.

Answer 1

I think the best answer that will describe chemical change is the first option. During a chemical change, both the identity and the properties of a substance change because new substances are being formed by a chemical reaction. An example is rusting of steel

Answer 2

Answer: Option (A) is the correct answer.

Explanation:

When there is a change in chemical bonding of atoms between one or more compounds then it results in the formation of new compounds. This is known as chemical change.

For example, $AgNO_{3}(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_{3}(aq)$ is a chemical change as there occurs change in identity and properties of the reactants.

Chemical changes can cause change in color, evolution of bubbles, and formation of precipitate.

Thus, we can conclude that the statement both the identity and the properties of a substance change best describes what happens during a chemical change.