Question

What happens to the total mass of a substance undergoing a physical change?

It stays the same.
It doubles.
It triples.
It is reduced.

Answer 1

During a physical change, the form of matter may change, but not its identity. During a physical change, the arrangement of particles may change but the mass, number of atoms and number of molecules will stay the same. Physical changes involve small changes in energy and are easily reversible.

Answer 2

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