Describe how the motion of particles in a substance changes when it is heated. What effect does this have on the internal energy of the substance?

When a substance is heated, the particles gain kinetic energy and move faster. This increase in particle motion raises the internal energy of the substance as it includes both the kinetic and potential energy of the particles.

Boundary lens: Keep this separate from nearby specification points that use similar words but test a different idea. This question asks: Describe how the motion of particles in a substance changes when it is heated. What effect does this have on the internal energy of the substance. The correct response is When a substance is heated, the particles gain kinetic energy and move faster. This increase in particle motion raises the internal energy of the substance as it includes both the kinetic and potential energy of the particles., because internal energy combines particle kinetic and potential energy. In Internal energy, the marking point should connect directly to use particle motion and particle arrangement to describe changes in 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 262 is distinct because it uses this exact question context and the boundary lens rather than a generic particle-model sentence.