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Understanding Gases 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. How would you rearrange the ideal gas equation to calculate the pressure of a gas?

Question 2 2. How do you calculate a and b in the van der Waals equation?

Question 3 3. If someone is measuring pressure, they might use any of the following units EXCEPT _____.

Question 4 4. Which Kelvin temperature is equal to 25 degrees Celsius?

Question 5 5. Which of the following is the best definition for Torr?

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. Dana has placed a few drops of food coloring in a mixture of water and vinegar to dye hard-boiled eggs with her daughter in preparation for Easter. The food coloring changing the color of the water is an example of _____.

Question 8 8. According to the kinetic molecular theory, temperature is directly proportional to _____.

Question 9 9. What does b represent in the van der Waals equation?

Question 10 10. 1000 mL of a gas at 15 atm is compressed to 500 mL. What is its new pressure?

Page 3

Question 11 11. Why does the volume of gas particles become important when the volume of the container is decreased?

Question 12 12. To use Gay-Lussac's Law, which of the following needs to remain constant?

Question 13 13. Which of these is considered an ideal condition for a gas?

Question 14 14. What volume is occupied by 15.0 moles of carbon dioxide gas at standard temperature and pressure?

Question 15 15. 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 4

Question 16 16. In the ideal gas equation, what does R represent?

Question 17 17. If a 22.4 L container is holding 1.00 mole of a gas at 273 kelvins, then what is its pressure?

Question 18 18. 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 19 19. One-third of a gaseous mixture is nitrogen and 2/3 of the gas is helium. The total pressure in the container is 3 atmospheres. What is the partial pressure of the nitrogen?

Question 20 20. Under non-ideal conditions, why was the pressure lower using the van der Waals equation?

Page 5

Question 21 21. A 4 L sample of gas is heated from 20 K to 200 K. What will its final volume be?

Question 22 22. The ideal gas constant, R, can be found using which of the following equations?

Question 23 23. Which of the following is TRUE about ideal gas particles?

Question 24 24. To use Boyle's Law, which of the following needs to remain constant?

Question 25 25. 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?

Page 6

Question 26 26. 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 27 27. 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 28 28. Why would a scientist have difficulty observing the behavior of an ideal gas?

Question 29 29. Which Celsius temperature is equal to 310 K?

Question 30 30. Assuming the volume is held constant, what happens to the pressure of a gas when the absolute temperature doubles?

Understanding Gases 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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