Question

which of these do not happen during a chemical change?
the chemical properties of the beginning substance(s) are the same as those of the end product(s)
the number of atoms in the reaction stays the same
new substance(s) are formed with different chemical properties
atomic bonds are formed or break apart

Explanation:

In a chemical change, new substances with different chemical properties are formed (so the chemical properties of reactants and products are not the same), atomic bonds are broken and new ones are formed, and the number of atoms remains the same according to the law of conservation of mass.

Answer:

The chemical properties of the beginning substance(s) are the same as those of the end product(s)