Particle Model of Matter -> Internal Energy, Energy Transfers

Question 1

What part of the internal energy changes if the state of a system changes?

Answer 1

The total potential energy of the particles.

Question 2

What is the “equation” that links
- internal energy
- total kinetic energy of the particles
- total potential energy of the particles?

Answer 2

internal energy = total kinetic energy of the particles + total potential energy of the particles

Question 3

What is internal energy?

Answer 3

The total energy stored by the particles that make up a substance.