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

Freezing occurs when a liquid cools down, causing the particles to lose energy. As the energy decreases, the particles move closer together and arrange themselves into a fixed structure, forming a solid.

Method lens: First identify the measured quantity, then match the equation or particle idea to the command word. This question asks: Explain the process of freezing in terms of particle energy and arrangement. The correct response is Freezing occurs when a liquid cools down, causing the particles to lose energy. As the energy decreases, the particles move closer together and arrange themselves into a fixed structure, forming a solid., because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to explain freezing using decreased particle energy and changed particle arrangement. 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 128 is distinct because it uses this exact question context and the method lens rather than a generic particle-model sentence.