Multiple choice

Which of the following statements is true about physical and chemical changes?

  1. During a chemical change, the reactants form the products with equal mass.

  2. The physical changes can not be reversed.

  3. The chemical changes can be reversed.

  4. In physical changes, a new substance is formed and energy is either given off or absorbed.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chemical change is any change that results in the formation of a new chemical substance. It involves making and breaking the bonds between atoms. It cannot be reversed. Physical change is affecting the form of a chemical substance, but not its chemical composition. It can be reversed. 

Keep practicing — related questions