Explain how the particle arrangement and movement change when a liquid boils.

When a liquid boils, the particles gain enough energy to overcome the forces holding them together. This causes the particles to move further apart and transition from a liquid state to a gas state, resulting in the formation of bubbles throughout the liquid.

Method lens: First identify the measured quantity, then match the equation or particle idea to the command word. This question asks: Explain how the particle arrangement and movement change when a liquid boils. The correct response is When a liquid boils, the particles gain enough energy to overcome the forces holding them together. This causes the particles to move further apart and transition from a liquid state to a gas state, resulting in the formation of bubbles throughout the liquid., because gas pressure comes from particle collisions with container walls. In Changes of state, the marking point should connect directly to describe solids, liquids and gases in terms of particle arrangement and movement. 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 Changes of state and the particle model, 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 116 is distinct because it uses this exact question context and the method lens rather than a generic particle-model sentence.