Question

Which changes to matter are described by the law of conservation of mass?

answers:

Only chemical changes, not physical change

All physical and chemical changes, including changes that involve gasses

Most changes, but not chemical changes that involve gasses

Only physical changes, not chemical changes

Answer 1

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction; it simply changes forms. Therefore, it applies to both physical and chemical changes, including those that involve gases.

The correct answer is:

**All physical and chemical changes, including changes that involve gases.**