F11_Exam%201%20review%20questions-2

F11_Exam%201%20review%20questions-2 - CHEM 101 Fall 11 Exam...

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CHEM 101 Fall 11 Exam 1 review questions 1) If matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a (an) __________. A) heterogeneous mixture B) element C) homogeneous mixture D) compound E) mixture of elements Answer: D 2) The initial or tentative explanation of an observation is called a(n) A) law. B) theory. C) hypothesis. D) experiment. E) test. Answer: C 3) Calculate the number of moles of CO present in a 125 g sample of the gas. A) 2.84 B) 4.46 C) 2.12 D) 8.93 E) 0.224 Answer: B 4) Calculate the number of molecules in 10.0 g F 2 . A) 3.83 × 10 18 B) 2.29 × 10 26 C) 1.58 × 10 23 D) 3.17 × 10 23 E) 6.02 × 10 24 Answer: C
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5) When the following equation is balanced with lowest ratio whole number coefficients, the coefficient of CaO is CaO + P 4 O 10 → Ca 3 (PO 4 ) 2 A) 3 B) 4 C) 5 D) 6 E) 7 Answer: D 6) When 0.340 mol butane, C 4 H 10 , is burned with excess oxygen, how many moles of
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This note was uploaded on 01/15/2012 for the course CHEMISTRY 101 taught by Professor King during the Spring '11 term at Drexel.

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F11_Exam%201%20review%20questions-2 - CHEM 101 Fall 11 Exam...

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