Which statement best describes the particle arrangement in gases?

The correct answer is Particles are far apart and move freely in all directions..

Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: Which statement best describes the particle arrangement in gases. The correct response is Particles are far apart and move freely in all directions., 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 119 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.