AQA GCSE Physics Internal energy and energy transfers

A few odd and challenging questions here.

  1. Copy and complete: Energy is stored inside a system by the particles (_________ and _______) that make up the system. This is called internal energy
  2. How is internal energy calculated using the kinetic energy and potential energy of the molecules that make up the system? 
  3. (harder) When a system is heated it changes the energy stored by increasing the energy of the particles. What two things can this do? 

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