Final answer:
The constant motion of atoms in molecules is an example of kinetic energy, while the arrangement of atoms and bonds represents potential energy.
Step-by-step explanation:
The constant motion of atoms in molecules is an example of kinetic energy. This is because the atoms are in motion, exhibiting random movements. On the other hand, the arrangement of atoms and bonds in molecules represents potential energy. This potential energy is released when chemical bonds are broken, and new ones are formed during chemical reactions.