How does heating affect the energy stored within a system?

The correct answer is It increases the energy stored by increasing particle energy.

Cause lens: Name the cause, then state the effect on particles, pressure, density, or energy. This question asks: How does heating affect the energy stored within a system. The correct response is It increases the energy stored by increasing particle energy, because internal energy combines particle kinetic and potential energy. In Internal energy, the marking point should connect directly to describe how changing particle arrangement can change the potential energy of particles. 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 232 is distinct because it uses this exact question context and the cause lens rather than a generic particle-model sentence.