2010F_chem_125_exam_1--44gt60xxherehia

2010F_chem_125_exam_1--44gt60xxherehia - Chem 125 Exam #1...

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Chem 125 Exam #1 Fall 2010 Ellis PART A. (4 Points each) 1. 5A + 3B 6C + 8D. How many moles of A are required make 1.63x10 -3 moles of D? a. 1.63x10 -3 b. 1.00x10 -3 c. 9.31x10 -4 d. 2.61x10 -3 e. 1.02x10 -3 2. A sheet of Gold (like a piece of paper; only it's gold) 11 inches by 11 inches has a mass of 0.0215 g. What is the average thickness of the sheet of gold? Possibly useful information: The density of gold is 19.3 g/cm 3 and 1 in = 2.54 cm. a. 1.43 x10 -6 cm b. 1.60x10 -5 cm c. 3.99 x10 -5 cm d. < 10 -6 cm e. > 10 -4 cm 3. What is the correct formula of Iron (II) carbonate? a. FeC 2 b. Fe 2 C c. FeCO 3 d. Fe(CO 3 ) 2 e. none of the above 4. What is the approximate molar mass of magnesium nitrate? a. 101 g/mol b. 141 g/mol c. 70. g/mol d. 86 g/mol e. 148 g/mol 5. What is the oxidation state assigned to nitrogen in NHF 2 ? a. 0 b. +2 c. -1 d. -3 e. +1
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Chem 125 Exam #1 Fall 2010 Ellis 6. If the following equation were balanced using the smallest possible integral coefficients, what would be the coefficient for oxygen? CH 3 CH 2 OH + O 2 CO 2 + H 2 O a. 7 b. 3 c. 4 d. 5 e. 6 7. When considering significant figures, which of the following answers is correct? a.
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2010F_chem_125_exam_1--44gt60xxherehia - Chem 125 Exam #1...

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