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. As temperature rises, the particles move faster, which means they have more energy and collide more frequently and with greater force.

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. 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. As temperature rises, the particles move faster, which means they have more energy and collide more frequently and with greater force., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Temperature changes in a system and specific heat capacity, the marking point should connect directly to recall and apply the equation change in thermal energy = mass x specific heat capacity x temperature change. 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 281 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.