Question

When an object is heated, the molecules that make up the object
a. begin to move faster
b. lose energy
c. become heavier
d. become lighter

Answer 1

Become lighter Or begin to move faster

Answer 2

When heat is added to a substance the molecules in it starts moving faster.

The space between them increases thus expanding and taking up space.

Thus heat can be transferred from one object to another.

But the mass of the object remains the same.

The state of matter will be determined by the spacing between the atoms.

Therefore liquids expand when it is heated and contract when it is cooled down.