#3 - Fall 07 - CHE 131 Exam 3, Fall 2007 Multiple Choice On...

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CHE 131 Exam 3, Fall 2007 Multiple Choice On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. The following is the reaction that occurs in automobile airbags: 2NaN 3 (s) 2Na(s) + 3N 2 (g) How many grams of sodium azide (NaN 3 ) are required to produce 19.00 L of N 2 at 293K and 775 mm Hg? A. 34.9 B. 52.0 C. 2.66 × 10 4 D. 3.89 × 10 5 E. 5.80 × 10 5 ____ 2. If, at constant temperature, the volume of a flask equipped with a moveable piston is reduced to 1/4 its original volume, what must happen to the pressure? A. It is increased by a factor of four. B. It is increased by a factor of eight. C. It is reduced to 1/4 the original pressure. D. It is reduced to 1/8 the original pressure. E. It remains the same as the original pressure. ____ 3. What is the maximum possible quantity of product obtained from a chemical reaction called? A. percent yield B. molecular weight of the product C. stoichiometric coefficients D. limiting reactant E. theoretical yield ____ 4. If 365 g of magnesium reacts with excess oxygen to produce 326 g of magnesium oxide, what is the percent yield for the reaction? 2 Mg + O 2 2 MgO A. 12.4% B. 32.6% C. 53.9% D. 89.3% E. 92.6% ____ 5. The density of water has its maximum value at 4 ° C because
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A. the thermal motion of the molecules overcomes the hydrogen bonds and allows the molecules to approach each other more closely. B. the thermal motion of the molecules is much greater than the energy of the hydrogen bonds and allows the molecules a great deal of freedom of motion. C. covalent bonds begin breaking at this temperature. D. the molecules are trapped in place by very strong hydrogen bonds.
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This test prep was uploaded on 04/17/2008 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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#3 - Fall 07 - CHE 131 Exam 3, Fall 2007 Multiple Choice On...

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