Exam 1 - Chem 125 Exam#1 Fall 2009 PART A(4 Points each...

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Chem 125 Exam #1 Fall 2009 Ellis PART A. (4 Points each) 1. 3A + 7B 2C + D. How many moles of B are required to react completely with 0.27 moles of A? a. 0.54 b. 0.57 c. 0.60 d. 0.63 e. 0.12 2. 2.0 g of a gasoline with a density of 0.68 g/cm 3 spills on a pond. It spreads out on the surface to form a layer 1500 angstroms thick. What is the area of the gasoline in square meters? (An angstroms is 10 -10 m.) a. 2.0 x10 5 b. 20. c. 110,000 d. 11 e. 1,100 3. What is the correct formula of zinc hydroxide? a. ZnOH b. Zn 2 OH c. Zn(OH) 2 d. ZnOH 2 e. ZnO 2 H 4. What is the correct name of P 2 S 5 ? a. phosphorus sulfide b. phosphorus sulfite c. diphosphorus pentasulfide d. phosphorus (V) sulfide e. none of the above 5. What is the correct formula for ammonium sulfate? a. (NH 4 ) 2 SO 4 b. NH 4 SO 4 c. (NH 4 ) 3 (SO 4 ) 2 d. (NH 4 ) 2 (SO 4 ) 3 e. NH 4 (SO 4 ) 2 6. What is the oxidation state of oxygen in LiO 2 ? a. 0 b. c. -1 d. -2 e. 2 + 0.27 7 0.63mol B 1 3 mol A mol B x mol A = ( 29 2 3 3 10 . . . 1 . . . ( ) 2.0 19.6 m . (0.68 / ) 100 /1 (1500 10 ) mass vol density x vol x mass vol den x vol den x t x A mass mass g A den x t g cm cm m x m - = = = = = = =
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Chem 125 Exam #1 Fall 2009 Ellis 23 23 2 2 2 2 2 2 15.0 1 2 6.02 10 5.31 10 H atoms 1 34.0 1 gH O mol H O mol H x atoms x x x x g mol H O mol = 7. If the following equation were balanced using the smallest possible integral coefficients, what would be the coefficient for water? C 3 H 6 (g) + O 2 (g) CO 2 (g) + H 2 0(l) a. 2 b. 3 2C 3 H 6 (g) + 9O 2 (g) 6CO 2 (g) + 6H 2 0(l) c. 4 d. 5 e. 6 8. The warmer the male cricket, the faster its metabolism and the faster it chirps. The temperature in Fahrenheit can be determined from the chirp rate using the following experimental formula: T = 50 + (N - 40) / 4 where N is the number of
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Exam 1 - Chem 125 Exam#1 Fall 2009 PART A(4 Points each...

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