A8 - StudHand - Name: D ate: Unit 8. Properties of Gases...

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Unit 8 Student Handout 1 Unit 8. Properties of Gases Chemistry I Accelerated 2008-9 Pressure 1. Explain how a gas in a container exerts pressure on the walls of the container. 2. What is meant when we say that a collision is perfectly elastic? 3. a. How does the pressure of a gas in a closed container change if its molecules strike the walls with greater force? b. How does the pressure change if the molecules strike with the same force, but more frequently? 4. How will the pressure of a gas in a closed container change if the volume of the container is reduced by half? Explain why. 5. The pressure on top of Mt. Everest averages about 235 mmHg. Convert this pressure to a. torr b. psi c. in Hg d. atm 6. The North American record for highest recorded barometric pressure is 31.85 inches of Hg (in Hg), set in 1989 in Northway, Alaska. Convert this pressure to a. mmHg b. atm 7. An open-end manometer is an instrument used to determine the pressure of a given system. The manometer illustrated below consists of a U-bend tube that contains mercury. One end of the manometer is open to the atmosphere. Examine the heights of the mercury columns and answer the questions that follow. a. Which vessel contains a gas with a pressure greater then atmospheric pressure? Explain. b. Which vessel contains a gas with a pressure less than atmospheric pressure? Explain. Name: Date:
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Unit 8 Student Handout 2 c. If atmospheric pressure is 1.00 atm, what is the pressure of gas B? d. What would happen to the level of mercury in the tubes of B, if the entire apparatus were brought to the top of a high mountain? Explain. Measuring Gas Pressures with a Closed Manometer EXAMPLE: Suppose the difference in height of two mercury levels in a closed manometer is 42 mm, as shown. What is the pressure in atm Hg of the gas in the container? Solving process: Because the column of mercury is 42 mm high and 760 mm of mercury equals 1.00 atm, the pressure is mm 760 atm 1.00 42.mm = 0.055 atm Measuring Gas Pressures with an Open Manometer EXAMPLE: An open manometer is filled with mercury. The difference between mercury levels in the two arms is 63.0 mm, as shown. What is the total pressure, in atm, of the gas in the container? The air pressure is 0.980atm. Solving process: The mercury is lower in the arm connected to the outside air. Thus, the pressure exerted by the gas sample must be less than the air pressure. As a result, we must subtract the pressure of the mercury from the air pressure to get the gas pressure. Before subtracting, however, we must convert the 63.0 mm difference in height to atmospheres. mm
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This note was uploaded on 03/12/2010 for the course CHM 1045 taught by Professor Yasui during the Spring '09 term at Broward College.

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A8 - StudHand - Name: D ate: Unit 8. Properties of Gases...

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