Explain how the particle model accounts for the increase in gas pressure when the temperature of a gas is raised at constant volume.

According to the particle model, increasing the temperature of a gas increases the average kinetic energy of its particles. As the particles move faster, they collide with the walls of the container more frequently and with greater force, resulting in an increase in gas pressure.

Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: Explain how the particle model accounts for the increase in gas pressure when the temperature of a gas is raised at constant volume. The correct response is According to the particle model, increasing the temperature of a gas increases the average kinetic energy of its particles. As the particles move faster, they collide with the walls of the container more frequently and with greater force, resulting in an increase in gas pressure., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Particle motion in gases, the marking point should connect directly to use the particle model to explain why gas pressure increases when temperature increases at constant volume. 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 Particle model and pressure, 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 491 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.