S08 Chem1A Midterm II Review

S08 Chem1A Midterm II Review - Spring 2008 Chem 1A Midterm...

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These were compiled by GSIs Paul Daubenmire and Lauren Comfort and are not necessarily reflective of exam questions. All chapter references are to the TRO text. Page 1 of 4 Chapter 5. Gases Figure 1 shows a thin-walled, cylindrical metal container fitted with a tight-fitting but freely movable lightweight plastic piston and containing 0.25 mol of helium at 0 ° C and a pressure of 1atm: 1. A student conducted the following series of experiments in a chemistry lab: Experiment 1: (isobaric process) The student measures the volume of the gas in the cylinder and then increases the temperature of the gas at constant pressure to 273 ° C. Experiment 2: (isochoric/isometric process) After the gas is allowed to cool back to 0 ° C at 1atm pressure, the student locks the piston in place, and then increases the temperature of the gas to 273 ° C. Experiment 3: (isothermal process) After Experiment 2 is completed, the student unlocks the piston and a computer- controlled heat source maintains the temperature at a constant 273°C. a. What volume does the student measure for the gas in the cylinder at the beginning of Experiment 1? b. How do the pressure and volume of the gas change as a result of the procedures in Experiment 2? c. How do the pressure and volume of the gas change as a result of Experiment 3? 2. The atoms or molecules of which ideal gas have the greatest average kinetic energy? a) Ar at 200 o C b) He at 400 o C c) He at 100 o C d) H 2 at 100 o C e) H 2 at 200 o C 3. A 4.4 g sample of a hydrocarbon gas fills a balloon to 0.56L at 4.4 atm and 300K. What is the molecular formula of the hydrocarbon?
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This homework help was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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S08 Chem1A Midterm II Review - Spring 2008 Chem 1A Midterm...

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