Question

wax melts when it is heated. which most likely describes what is true of the result of this reaction?
the bonding of the atoms is not the same before and after the change.
the wax has the same density before and after the change.
the same amount of wax exists before and after the change.
the wax cannot be changed back into a solid.

Explanation:

Melting wax is a physical change. In physical changes, the amount of substance remains the same. The bonding of atoms (if it were a chemical change, but this is physical), density (changes as state changes, solid to liquid), and ability to change back (it can solidify again) are not correct.

Answer:

The same amount of wax exists before and after the change.