Question

Molecules of a substance are always in a state of _________, so they possess __________ energy.

• A. random motion
• B. kinetic energy

Answer 1

1. The motion of particles and the force of attraction between the particles are explained in detail by kinetic theory.
2. According to the postulates of the kinetic theory of matter, the constituent particles are in constant random motion and possess kinetic energy.
3. Kinetic energy is directly proportional to an increase in temperature.

Hence, molecules of a substance are always in a state of random motion, so they possess kinetic energy.