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Gas Laws Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

Page 1

Question 1 1. Oxygen is collected in a test tube over 30 degree Celsius water. The vapor pressure of the water at that temperature is about 32 mmHg. If the atmospheric pressure is 640 mmHg, then what percentage of the gas in the test tube is oxygen?

Question 2 2. A sealed vessel contains 50% oxygen, 10% carbon dioxide, and 40% nitrogen gas. The total pressure of the gas mixture is 5 atmospheres. What is the partial pressure of the carbon dioxide?

Question 3 3. If you want to find the volume of a gas using the ideal gas law, which values do you need to know?

Question 4 4. In the ideal gas equation, what does R represent?

Question 5 5. Assuming pressure and temperature are held constant, then what happens to the volume of a non-rigid container when the number of molecules in the container is doubled?

Page 2

Question 6 6. Which units of pressure are needed if you are going to use 0.0821 as your ideal gas constant?

Question 7 7. If carbon dioxide molecules effuse at an average rate of 5 mol/s, at what rate would diatomic hydrogen molecules effuse in the exact same conditions?

Question 8 8. The _____ states that gas particles are constantly moving in rapid, random movement.

Question 9 9. Assuming the volume is held constant, what happens to the pressure of a gas when the absolute temperature doubles?

Question 10 10. A 4 L sample of gas is heated from 20 K to 200 K. Its initial pressure was 60 torr. What is its final pressure?

Page 3

Question 11 11. A sample of hydrogen has a volume of 25 L under a pressure of 5 atm. What will the pressure of this gas be if the volume were decreased to 5 L?

Question 12 12. At constant temperature, what happens to the pressure when the volume is doubled?

Question 13 13. Under non-ideal conditions, why was the pressure lower using the van der Waals equation?

Question 14 14. What does b represent in the van der Waals equation?

Question 15 15. Avogadro's law shows the relationship between _____.

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Question 16 16. A container has a volume of 53.9 L. Assuming it is at STP, how many moles of gas particles does it contain?

Question 17 17. To use Charles' Law, which of the following needs to remain constant?

Question 18 18. 1000 mL of a gas is cooled from 500 K to 250 K. What is its final volume?

Question 19 19. Which of the following is TRUE about ideal gas particles?

Question 20 20. What does it mean when a collision is elastic?

Page 5

Question 21 21. Why are the van der Waals constants a and b different for each gas?

Question 22 22. In the van der Waals equation, what does a represent?

Question 23 23. A gas is collected by water displacement at 25 degrees Celsius. The vapor pressure of water at that temperature is 24 mmHg. If the atmospheric pressure is 800 mmHg, then what is the pressure of the dry gas you collected?

Question 24 24. How would you rearrange the ideal gas equation to calculate the pressure of a gas?

Question 25 25. The ideal gas constant, R, can be found using which of the following equations?

Page 6

Question 26 26. Which of the following statements best represents Graham's Law?

Question 27 27. A sample of an ideal gas is heated from 200 degrees Celsius to 400 degrees Celsius. If the initial pressure is 45 torr, then what is the final pressure?

Question 28 28. To use Boyle's Law, which of the following needs to remain constant?

Question 29 29. Why do a and b get multiplied by n in the van der Waals equation?

Question 30 30. An expandable container is holding 0.75 moles of argon with a volume of 5.0 L. Assuming the temperature and pressure are held constant, how many moles of argon would be needed to increase the volume to 7.0 L?

Gas Laws Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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