winter 08 chem1b-020 2 midterm 02.25.08

winter 08 chem1b-020 2 midterm 02.25.08 -...

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.INTACTBLOCK {page-break-inside: avoid ;} .INTACTBLOCKR {page-break-inside: avoid ;} .INTACTBLOCK {page-break- inside: avoid ;} .INTACTBLOCKR {page-break-inside: avoid ;} .INTACTBLOCK {page-break-inside: avoid ;} .INTACTBLOCKR {page-break-inside: avoid ;} Midterm II A Created: 9:21:56 AM PST Student: _________________________________________________________ 1. A flask containing neon gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where the prevailing pressure is 745 torr. The mercury level in the open arm is 50. mm below that in the arm connected to the flask of neon. What is the neon pressure, in torr? A. -50. torr B. 50. torr C. 695 torr D. 795 torr E. none of these choices is correct 2. Assuming ideal behavior, what is the density of argon gas at STP, in g/L? A. 0.0176 g/L B. 0.0250 g/L C. 0.0561 g/L D. 1.78 g/L E. 181. g/L 3. A gas mixture consists of equal masses of methane (molecular weight 16.0) and argon (atomic weight 40.0). If the partial pressure of argon is 200. torr, what is the pressure of methane, in torr? A. 80.0 torr B. 200. torr C. 256 torr D. 500. torr E. 556 torr 4. The air pressure in a volleyball is 75 psi. What is this pressure in torr? A. 520 torr B. 562 torr C. 3900 torr D. 7600 torr E. 75000 torr 5. "The total pressure in a mixture of unreacting gases is equal to the sum of the partial pressures of the individual gases" is a statement of __________________ Law. A. Charles's B. Graham's C. Boyle's D. Avogadro's E. Dalton's 6. Which of the lines on the figure below is the best representation of the relationship between the volume of a gas and its pressure, other factors remaining constant?
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A. a B. b C. c D. d E. e 7. What are the conditions of STP? A. 0 K and l atm B. 273.15 K and 760 torr C. 0°C and 760 atm D. 273.15°C and 760 torr E. none of these choices is correct 8. The ozone layer is important because A. ozone absorbs low energy radiation which warms the troposphere. B. ozone purifies the atmosphere by reacting with excess fluorocarbons. C. ozone absorbs ultraviolet radiation. D. ozone reflects high energy radiation such as X-rays and gamma rays. E. humans need to breathe air containing some ozone. 9. Arrange the following gases in order of increasing rate of effusion. C 2 H 6 Ar HCl PH 3 A. Ar < HCl <PH 3 < C 2 H 6 B. C 2 H 6 < PH 3 < HCl < Ar C. Ar < PH 3 < C 2 H 6 < HCl D. C 2 H 6 < HCl < PH 3 < Ar E. Ar <PH 3 < HCl < C 2 H 6 10. Examine the following phase diagram and identify the feature represented by point A.
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A. melting point B. critical point C. triple point D. sublimation point E. boiling point 11. Ammonia's unusually high melting point is the result of A. dipole-dipole forces. B.
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winter 08 chem1b-020 2 midterm 02.25.08 -...

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