The total energy of all the particles in a substance is called

Internal energy

Explanation:

Particles have two main energies that scientists acknowledge.

The energy that is associated with their movement which we call kinetic energy. It is worth noting that particles have different kinetic energy, however the average kinetic energy that they have is directly proportional to temperature. The energy that is due to the interactive forces (attraction or repulsion) between particles is called potential energy

When these two types of energies are considered collectively, we call that internal energy