3.2.1 Internal Energy

• What is internal energy?

  Energy stored by the particles in a system.
• What two energy stores are involved in internal energy?

  Kinetic energy and potential energy.
• How does heating affect the energy of a substance?

  • Heating transfers energy to the substance.
  • It increases the energy of the particles that make up the substance.
• What two things can heating a substance cause?

  A temperature increase and a change in state.