Question detail
If a gas has a pressure of 200,000 Pa and occupies a volume of 5.0 m³, what will be the pressure if the volume is decreased to 2.5 m³ at constant temperature (Pressure in gases (physics only)) ? P43-065 Pressure in gases (physics only) 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. 400000 Pa ? P43-065 density measurement and calculation
- B. P43-065 trap: this swaps density measurement and calculation for a neighbouring particle-model idea.
- C. P43-065 trap: this omits pressure, volume, constant temperature from the explanation.
- D. P43-065 trap: this answer belongs outside Pressure in gases (physics only).
Answer
The correct answer is 400000 Pa ? P43-065 density measurement and calculation.
Explanation
Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: If a gas has a pressure of 200,000 Pa and occupies a volume of 5.0 m³, what will be the pressure if the volume is decreased to 2.5 m³ at constant temperature (Pressure in gases (physics only)) ?. The correct response is 400000 Pa ? P43-065 density measurement and calculation, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Pressure in gases (physics only), the marking point should connect directly to (Physics only) Calculate pressure when volume changes at constant temperature. 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 549 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.
Common mistake
Pressure Calculation Confusion
Students often confuse the relationship between pressure and volume, mistakenly thinking that increasing volume always increases pressure.
Remember that at constant temperature, increasing the volume of a gas decreases its pressure, as the particles collide less frequently with the container walls.
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