Question

what do these two changes have in common? melting wax ice crystals forming on a window select all that apply. both are caused by cooling. both are caused by heating. both are chemical changes. both are changes of state.

Explanation:

Melting wax is a physical change (solid to liquid due to heating). Ice crystals forming on a window is a physical change (gas to solid due to cooling). Both are physical changes (changes of state). Chemical changes involve new substances formed, which is not the case here. Heating causes melting (wax), cooling causes ice crystals (water vapor to ice).

Answer:

Both are changes of state.