121quiz2Tans

121quiz2Tans - a) 0.964 b) 0.428 c) 41.8 d) 27.9 e) 62.7 2...

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Quiz 2 Dr. Heyns Chemistry 121 Tuesday Autumn Quarter 2006 October 10, 2006 Time: 20 min Points: 30 Name of student:__________________________________ Name of TA:______________________________________ 1. (5 pts) When the following equation is balanced, the coefficient of C 3 H 8 O 3 is ______. C 3 H 8 O 3 (g) + O 2 (g) → CO 2 (g) + H 2 O (g) a) 1 b) 2 c) 3 d) 7 e) 5 1
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2. (7 pts) A compound that is composed of carbon, hydrogen, and oxygen contains 70.6% C, 5.9% H, and 23.5% O by mass. What is the empirical formula? a) C 8 H 8 O 2 b) C 8 H 4 O c) C 4 H 4 O d) C 9 H 12 O e) C 5 H 6 O 2 3. (7 pts) Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements. 2NaN 3 (s) → 2Na (s) + 3N 2 (g) How many grams of sodium azide are required to produce 18.0 g of nitrogen?
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Unformatted text preview: a) 0.964 b) 0.428 c) 41.8 d) 27.9 e) 62.7 2 4. (5 pts) When 884 g of Fe 2 O 3 was reduced with an excess of carbon, 507 g of Fe was obtained according to the following reaction. What was the yield of the reaction? Fe 2 O 3 + 3 C 2 Fe + 3 CO 82% 5.(3 pts) Which one of the following polyatomic ions has the same charge as the hydroxide ion? a) ammonium b) carbonate c) nitrate d) sulfate e) phosphate 6.(3 pts) Which metal does not require to have its charge specified in the names of ionic compounds it forms? a) Mn b) Fe c) Cu d) Ca e) Pb 3...
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121quiz2Tans - a) 0.964 b) 0.428 c) 41.8 d) 27.9 e) 62.7 2...

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