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Ideal gas molecules

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Question 42
a.

A student investigates how the volume of a fixed mass of gas changes with temperature at a constant pressure.

The graph shows her results.

A line graph with temperature in degrees Celsius on the horizontal axis and volume of gas in cubic centimeters on the vertical axis. The horizontal axis is labeled 'temperature in °C' and ranges from -300 to 150 with grid lines every 5 units, and major labels at -300, -250, -200, -150, -100, -50, 0, 50, 100, and 150. The vertical axis is labeled 'volume in cm³' and ranges from 0 to 150 with grid lines every 5 units, and major labels at 50, 100, and 150. A thick vertical axis is at 0 °C. The graph shows a solid line of best fit starting at a temperature of 0 °C and volume of 100 cm³, going up and to the right through the plotted data points. There are four plotted data points marked with small crosses close to this line at (20, 107), (50, 118), (80, 129), and (110, 140). The grid to the left of 0 °C is empty, providing space for the line to be extended backwards to meet the temperature axis.

Extend the line of best fit to find the temperature of the gas when the volume is zero cm3\text{cm}^3cm3.

[2]
b.

State what happens to the average kinetic energy of the gas molecules when the temperature of the gas is decreased.

[1]
c.

The student then investigates how the pressure of a gas changes with volume at constant temperature.

State two variables that she should control in this investigation.

[2]
d.

Describe the relationship between the pressure of a gas and its volume. You may sketch a graph to help your answer.

[2]

Ideal gas molecules Questions

  1. IGCSE
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  3. /Ideal gas molecules