Name: ________________________ Class: ___________________ Date: __________ Form: A1Quiz 2Multiple ChoiceIdentify the choice that best completes the statement or answers the question.Record the test form letter in the TEST FORM box on your ParSCORE form.Record your name on the top of this exam and on the scantron form.Be sure to fill out your perm ID# on your scantron correctly. Record all of your answers on the scantron form. 1. (2 points) Which of the following is true for the van der Waals equation for real gasesI. gas particles have non-zero volumes and interact with each other.II. the non-zero volumes of gas particles effectively decrease the amount of "empty space" between them.III. the molecular attractions between particles of gas increases the pressure exerted by the gas.a. I & IIIb. II & IIIc. I & IId. I, II & IIIe. I 2. (2 points) According to kinetic-molecular theory, in which of the following gases will the root-mean-square speed of the molecules be the highest at 200 °C?a. HClb. Cl2c. H2Od. SF6e. None. The molecules of all gases have the same root-mean-square speed at any given 3. (3 points) In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is ________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.a. 0.583b. 0.238c. 0.417d. 0.179e. 0.357Name: ________________________ Form: A2 4. (3 points) Zinc reacts with aqueous sulfuric acid to form hydrogen gas:Zn (s) + H2SO4 (aq) Zn SO4 (aq) + H2 (g)In an experiment, 201 mL of wet H2 is collected over water at 27 °C and a barometric pressure of 765 torr. How many grams of Zn have been consumed? The vapor pressure of water at 27 °C is 26.74 torr. a. 0.519b. 519c. 0.537d. 4.38 × 106e. 3.94 × 105 5. (3 points) The molecular weight of a gas is ________ g/mol if 3.5 g of the gas occupies 2.1 L at STP.a. 37b. 42c. 4.6 × 102d. 2.7 × 10–2e. 5.5 × 103 6. (3 points) A sample of oxygen gas (O2) was found to effuse at a rate equal to three times that of an unknown gas. The molecular weight of the unknown gas is ________ g/mol.a. 10.7b. 55c. 288d. 4e. 96 7. (2 points) If the pressure in a gas container that is connected to an open-end U-tube manometer is 700 mm Hg and the pressure of the atmosphere at the open end of the tube is 760 mm Hg, the level of mercury in the tube will bea. 700 mm higher in the arm connected to the gas cylinder.b. 60 mm higher in the arm open to the atmospherec. 700 mm higher in the arm open to the atmosphere.d. 60 mm higher in the arm connected to the gas cylinder.e. 760 mm higher in the arm open to the atmosphere. 8. (2 points) For an ideal gas, if the temperature of the gas is decreaseda. The collision frequency(rate) increasesb. The collision frequency(rate) decreasesc. The collision frequency(rate) stays the sameID: A1Quiz 2Answer SectionMULTIPLE CHOICE 1. ANS: C PTS: 2 2. ANS: C PTS: 2 3. ANS: A PTS: 3 4. ANS: A PTS: 3 5. ANS: A PTS: 3 6. ANS: C PTS: 3 7. ANS: D PTS: 2 8. ANS: B PTS:
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