IB Physics HL B 3 4 Empirical Gas Laws Questions

Practise IB Physics HL B.3.4 by analysing multi-state ideal-gas processes, graph transformations and empirical limits of gas laws.

Exam points

Combine pV/T across several states to solve temperatures, pressures and volumes in compound processes.
Evaluate gas-law graphs and empirical relationships, including constant-temperature and constant-pressure experiments.

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Study B.3.4—Empirical gas laws conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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The equipment shown in the diagram was used by a student to investigate the variation with volume, of the pressure p of air, at constant temperature. The air was trapped in a tube of constant cross-sectional area above a column of oil.

Figure for Question IB Physics HL B 3 4 Empirical Gas Laws Questions question 1 — IB Physics HL

The pump forces oil to move up the tube decreasing the volume of the trapped air.

Outline how the results of this experiment are consistent with the ideal gas law at constant temperature.

$V\propto H$ , thus the ideal gas law gives $p\propto\frac{1}{H}$ .

So the graph should be a straight line through the origin, as observed.

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IB Physics HL B 3 4 Empirical Gas Laws Questions question 1