Question

what do these two changes have in common? butter melting on a hot day picking up a paper clip with a magnet select all that apply. both are only physical changes. both are changes of state. both are caused by heating. both conserve mass.

Explanation:

Melting butter is a physical change where it changes state from solid to liquid due to heat, and picking up a paper - clip with a magnet is a physical change due to magnetic force. In physical changes, mass is conserved as no new substances are formed. The paper - clip pickup is not a change of state or caused by heating.

Answer:

A. Both are only physical changes.
D. Both conserve mass.