Question

1. if you start with a substance as a solid, what will happen to the molecules as you add thermal energy (heat)?

once you have completed your prediction questions, open the phet simulation:

Explanation:

When heat is added to a solid, the thermal energy causes the molecules to vibrate more vigorously about their fixed positions. As more heat is added, the molecules gain enough energy to overcome the intermolecular forces holding them in place in the solid - lattice structure. Eventually, the solid will melt and the molecules will be able to move more freely.

Answer:

The molecules will vibrate more vigorously. As more heat is added, the intermolecular forces are overcome and the solid may melt, allowing the molecules to move more freely.