Question detail

What causes gas pressure in a container ? P43-005 Increasing the pressure of a gas (physics only) (HT only) checkpoint

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Particle model and pressure

Question

A. The collisions of gas particles with the walls of the container ? P43-005 density measurement and calculation
B. P43-005 trap: this swaps density measurement and calculation for a neighbouring particle-model idea.
C. P43-005 trap: this omits compression, temperature, HT only from the explanation.
D. P43-005 trap: this answer belongs outside Increasing the pressure of a gas (physics only) (HT only).

Answer

The correct answer is The collisions of gas particles with the walls of the container ? P43-005 density measurement and calculation.

Explanation

Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: What causes gas pressure in a container ?. The correct response is The collisions of gas particles with the walls of the container ? P43-005 density measurement and calculation, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Increasing the pressure of a gas (physics only) (HT only), the marking point should connect directly to (Physics only) (HT only) Distinguish temperature increase during compression from pressure increase caused by reduced volume. 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 623 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.

Common mistake

Confusing Temperature and Pressure Changes

Students often confuse the increase in temperature during gas compression with the increase in pressure caused by reduced volume.

To fix this, remember that temperature increase is related to the average kinetic energy of gas particles, while pressure increase is due to more frequent collisions with the container walls as volume decreases.

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