Question detail
How do gas particles behave in terms of motion?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Particle model and pressure
Question
- A. They move in a straight line without changing direction.
- B. They are stationary.
- C. They move in constant random motion.
- D. They only move when heated.
Answer
The correct answer is They move in constant random motion..
Explanation
Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: How do gas particles behave in terms of motion. The correct response is They move in constant random motion., because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to describe how increasing temperature increases the average kinetic energy of gas particles. 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 Particle model and pressure, 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 479 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.
Common mistake
Temperature and Kinetic Energy Confusion
Students often confuse temperature with the average kinetic energy of gas particles, thinking they are the same concept.
Remember that temperature is a measure of the average kinetic energy of the particles in a substance. Increasing temperature means the particles move faster, which increases their average kinetic energy.
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