Question

What happens to mass and energy during physical and chemical changes?

Answer 1

Answer:

During a physical change, the arrangement of particles may change but the mass, number of atoms and number of molecules will stay the same. ... During a chemical change, the mass and number of atoms is conserved, but the number of molecules is not always the same. Chemical reactions involve large changes in energy.

Explanation:

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Answer 2

Answer:

During a physical change, the arrangement of particles may change but the mass, number of atoms and number of molecules will stay the same. ...During a chemical change, the mass and number of atoms is conserved, but the number of molecules is not always the same. Chemical reactions involve largechanges in energy.

IN THIS ANSWER THE LAW OF CONSERVATION IS USED .

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