A student investigates how the volume of a gas changes with temperature at constant pressure. She plots a graph of volume (y-axis) against temperature in °C (x-axis). What shape of graph should she obtain?

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Question

A student investigates how the volume of a gas changes with temperature at constant pressure. She plots a graph of volume (y-axis) against temperature in °C (x-axis). What shape of graph should she obtain?

Accepted Answer

A straight line that, when extrapolated, crosses the x-axis at −273 °C — At constant pressure, volume is directly proportional to absolute temperature (Charles's Law). When plotted against Celsius temperature, the graph is a straight line that extrapolates to zero volume at −273 °C (absolute zero). Option A describes a non-linear relationship. Option B is incorrect — the line does not cross at 0 °C. Option D would imply volume does not change with temperature, contradicting Charles's Law.

Answer

A horizontal straight line showing no change in volume

Answer

A straight line that passes through 0 °C on the x-axis

Answer

A straight line that, when extrapolated, crosses the x-axis at −273 °C

Answer

A curved line through the origin

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