What happens to the average kinetic energy of particles when the temperature of a substance increases?

The correct answer is The average kinetic energy increases..

Cause lens: Name the cause, then state the effect on particles, pressure, density, or energy. This question asks: What happens to the average kinetic energy of particles when the temperature of a substance increases. The correct response is The average kinetic energy increases., because internal energy combines particle kinetic and potential energy. In Internal energy, the marking point should connect directly to distinguish temperature from internal energy. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 244 is distinct because it uses this exact question context and the cause lens rather than a generic particle-model sentence.