Explain how increasing the temperature of a substance affects the average kinetic energy of its particles.

Increasing the temperature of a substance increases the average kinetic energy of its particles. This is because temperature is a measure of the energy of the particles; as temperature rises, the particles move faster and collide more energetically.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: Explain how increasing the temperature of a substance affects the average kinetic energy of its particles. The correct response is Increasing the temperature of a substance increases the average kinetic energy of its particles. This is because temperature is a measure of the energy of the particles; as temperature rises, the particles move faster and collide more energetically., because internal energy combines particle kinetic and potential energy. In Internal energy, the marking point should connect directly to describe how increasing temperature increases the average kinetic 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 231 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.