Question

What happens when a metal bar is heated?
the distance between the molecules increases

the molecules get larger

the molecules vibrate slower

the molecules get smaller

Answer 1

Answer:

get larger

Explanation:

The expansion (or contraction) of any material is due to the kinetic energy of its atoms. When a material is heated, the increase in energy causes the atoms and molecules to move more and to take up more space— that is, to expand. This is true of even a solid such as a metal.