Describe how the particle arrangement differs between solids, liquids, and gases.

In solids, particles are closely packed in a fixed arrangement and vibrate in place. In liquids, particles are still close but can move past each other, allowing the liquid to flow. In gases, particles are far apart and move freely, resulting in no fixed shape or volume.

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: Describe how the particle arrangement differs between solids, liquids, and gases. The correct response is In solids, particles are closely packed in a fixed arrangement and vibrate in place. In liquids, particles are still close but can move past each other, allowing the liquid to flow. In gases, particles are far apart and move freely, resulting in no fixed shape or volume., because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to explain condensing using decreased particle energy and closer 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 153 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.