Explain the process of boiling in terms of particle energy and arrangement.

Boiling occurs when particles in a liquid gain enough energy to overcome the forces holding them together. As the temperature increases, the particles move faster, and when they have sufficient energy, they can separate from each other, forming gas bubbles throughout the liquid.

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. This question asks: Explain the process of boiling in terms of particle energy and arrangement. The correct response is Boiling occurs when particles in a liquid gain enough energy to overcome the forces holding them together. As the temperature increases, the particles move faster, and when they have sufficient energy, they can separate from each other, forming gas bubbles throughout the liquid., because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to explain boiling using particles gaining enough energy to separate throughout a liquid. 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 137 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.