Quick answer: The ideal gas law, PV = nRT, links pressure, volume, amount and absolute temperature of a gas. This AP Chemistry test on ideal gas law has 8 questions worth 20 marks, to do in 45 minutes: gas law basics, ideal gas law and speed distribution. The mark scheme is on a separate page; free printable PDF.
This AP Chemistry test on ideal gas law test works like a real class test. The mark scheme is on a separate page, so revise with the lesson first.
This test lasts 45 minutes and is worth 20 points. Use R = 8.314 L·kPa/(mol·K), show every substitution with units and convert temperatures to kelvin. For explanations, link your answer to the motion of particles.
Level: AP Chemistry · Curriculum: AP Chem Unit 3
Ideal gas law test: the test questions
Question 1 Gas law basics (2 marks)
A fixed amount of gas has a volume of 8.0 L at 150 kPa. Calculate the volume at 400 kPa and the same temperature.Question 2 Ideal gas law (3 marks)
Calculate the amount of gas in a 2.50 L container at 200 kPa and 27 °C.Question 3 Speed distribution (4 marks)
- Identify which curve is at the higher temperature. (1 mark)
- Explain two differences between the curves. (2 marks)
- State what happens to the area under Q if the number of molecules doubles. (1 mark)
Question 4 Total pressure of a mixture (2 marks)
A 5.00 L container at 300 K holds 0.200 mol He and 0.300 mol Ne. Calculate the total pressure.Question 5 Partial pressure of helium (2 marks)
For the same mixture (0.200 mol He, 0.300 mol Ne, total pressure 249 kPa), calculate the partial pressure of helium.Question 6 Why gases deviate (3 marks)
Explain why a real gas deviates from ideal behaviour at high pressure and at low temperature.Question 7 Molar mass (2 marks)
A gas of mass 0.800 g occupies 0.500 L at 100 kPa and 300 K. Calculate its molar mass.Question 8 Gas over water (2 marks)
Explain why the vapour pressure of water must be subtracted from the total pressure when gas is collected over water.
