Question detail
What is the effect of gas particle collisions on the walls of a container (Particle motion in gases)
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 decrease the temperature of the gas.
- B. They exert a force, resulting in gas pressure.
- C. They cause the gas to escape.
- D. They have no effect on the walls.
Answer
The correct answer is They exert a force, resulting in gas pressure..
Explanation
Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: What is the effect of gas particle collisions on the walls of a container (Particle motion in gases). The correct response is They exert a force, resulting in gas pressure., because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to distinguish gas pressure from atmospheric pressure in particle-model explanations. 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 507 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.
Common mistake
Confusing gas pressure with atmospheric pressure
Students often say that gas pressure is the same as atmospheric pressure, or that the two pressures are interchangeable in particle‑model explanations.
Explain that gas pressure is the force per unit area exerted by gas particles on the walls of their own container, while atmospheric pressure is the force per unit area exerted by the air outside the container. In particle‑model terms, gas pressure arises from collisions of the gas’s own particles, whereas atmospheric pressure results from collisions of the surrounding air particles. Clarify that the two pressures can have the same numerical value (e.g. 1 bar) but they are distinct physical quantities and should be treated separately in explanations.
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