Understanding the Law of Conservation of Mass

What does it mean when something is conserved?

• It remains unchanged.

• It is destroyed.

• It is created.

• It changes over time.

In a defined system, when does the mass change?

• When the system is at rest.

• When particles enter or leave the system.

• When particles are destroyed.

• When particles are created.

What happens to mass in a closed system where no particles enter or leave?

• The mass is destroyed.

• The mass increases.

• The mass remains constant.

• The mass decreases.

On a universal scale, why can't mass change?

• Because nothing can enter or leave the universe.

• Because the universe is expanding.

• Because particles are constantly destroyed.

• Because particles are constantly created.

What does the law of conservation of mass state about matter?

• Matter can be created or destroyed.

• Matter cannot be created or destroyed.

• Matter can only be destroyed.

• Matter can only be created.