Question 1
Question detail
What happens to gas pressure when the volume of the gas decreases at constant temperature (Particle motion in gases) ? P43-058 Particle motion in gases checkpoint
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. The pressure increases ? P43-058 gas pressure collision reasoning
- B. P43-058 trap: this swaps gas pressure collision reasoning for a neighbouring particle-model idea.
- C. P43-058 trap: this omits gas pressure, collision, force from the explanation.
- D. P43-058 trap: this answer belongs outside Particle motion in gases.
Answer
The correct answer is The pressure increases ? P43-058 gas pressure collision reasoning.
Explanation
Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: What happens to gas pressure when the volume of the gas decreases at constant temperature (Particle motion in gases) ?. The correct response is The pressure increases ? P43-058 gas pressure collision reasoning, because gas pressure comes from particle collisions with container walls. In Particle motion in gases, the marking point should connect directly to explain that the force from particle collisions produces gas pressure. 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 474 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.
Common mistake
Misunderstanding Gas Pressure
Students often confuse gas pressure with the total force exerted by gas particles, rather than understanding that gas pressure is the force per unit area exerted on the walls of the container.
To fix this, remember that gas pressure is calculated as the force from particle collisions divided by the area over which the force is applied. Focus on the relationship between force, area, and pressure.
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