As the temperature of a fixed volume of a gas increases, the pressure will ____.

Question

BlackTom AI · Accepted Answer

Consider the relationship described in the question: at a fixed volume, changing temperature affects pressure. 
Option 1: 'vary inversely' would mean that as temperature rises, pressure falls, or vice versa. This contradicts the direct proportionality between pressure and temperature at constant volume, so this option is inconsistent with the gas law in play.
Option 2: 'decrease' suggests that increasing temperature reduces pressure. Again, this goes against the established direct link between T and P when volume is constant; higher temperature tends to push particles to collide more with container walls, raising pressure.
Option 3: 'not change' implies that pressure remains the same despite increasing temperature. Since kinetic energy increases with temperature, particle collisions become more frequent or energetic, producing a greater force per area; thus pressure should change, not stay fixed.
Option 4: 'increase' aligns with the principle that, for a gas at constant volume, pressure is directly proportional to temperature (P ∝ T). As temperature goes up, average kinetic energy rises, leading to more forceful molecular impacts on the container walls and hence higher pressure.
Putting these together, the only option that matches the correct physical behavior is the one describing a rise in pressure with temperature, while the others describe inverse, no-change, or opposite trends that conflict with the fixed-volume gas law.

Chemistry (H) - Varnold - Preparatory Academy - 2nd Semester - 2024/2025 Gases Practice Test for the Final

As the temperature of a fixed volume of a gas increases, the pressure will ____.

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