Colorado Esthetician Written Practice Exam

What results from a chemical change?

1. A new substance with different properties from the original

2. A mixture of substances maintaining their original properties

3. A physical change in the state of a substance

4. A rearrangement of molecules without forming new substances

The correct answer is: A new substance with different properties from the original

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.