Final answer:
In physical changes, mass is conserved, ensuring that the total mass, number of atoms, and molecules remain constant throughout the process.
Explanation:
In physical changes, mass is conserved. This means that the total mass, number of atoms, and number of molecules remain the same before and after the change. For example, in a reaction forming magnesium oxide from magnesium metal and oxygen, the total mass of the products equals the mass of the reactants.
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