Question

Which changes to matter are described by the law of conservation of mass? (1 point)
Responses

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

Only chemical changes, not physical changes
Only chemical changes, not physical changes

Most changes, but not chemical changes that involve gases.
Most changes, but not chemical changes that involve gases.

Only physical changes, not chemical changes
Only physical changes, not chemical changes

Answer 1

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

Explanation: Mass is conserved in both physical and chemical processes as long as the system is closed. Apparent mass changes when gases escape or enter are due to open systems, not a violation of the law.