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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) 3) Calculate the number of moles of CO present in a 125 g sample of the gas. 4) Calculate the number of molecules in 10.0 g F 2 .
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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
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