Question

what happens to the molecules when heat is applied?
they move slower and further away
they move slower and closer together
they move faster and closer together
they move faster and further away
question 2
what happens to volume as molecules move faster?
it increase because molecules are moving closer to each other
it decreases because molecules are moving closer to each other
it increases because the molecules are moving away from each other
it decreases because molecules are moving away from each other

Explanation:

When heat is applied, molecules gain kinetic energy. Kinetic energy is related to motion, so they move faster. As they move faster, they tend to move further apart (for example, in the case of a solid turning into a liquid or a liquid into a gas, the volume increases as molecules move more freely and apart). For the volume question, when molecules move faster (gain energy) and move apart (as per the first - part concept), the volume occupied by the substance increases.

Answer:

For the first question: they move faster and further away.
For the second question: It increases because the molecules are moving away from each other.