Colorado Esthetician Written Practice Exam

A chemical change results in the formation of a new substance with different properties from the original substance. During a chemical change, the atoms and molecules rearrange themselves, leading to the creation of a completely new substance with distinct chemical properties. This process is characterized by the formation of new chemical bonds and a change in the composition of the substances involved.

Options B, C, and D are incorrect:

B. A mixture of substances maintaining their original properties - This describes a physical mixture where the substances are physically combined but retain their original properties and can be separated easily.

C. A physical change in the state of a substance - A physical change involves a change in the state or appearance of a substance without altering its chemical composition.

D. A rearrangement of molecules without forming new substances - This does not represent a chemical change as it implies only a physical rearrangement of molecules without the formation of new substances.