HSK Exam Fall 2011 Answer Key

HSK Exam Fall 2011 Answer Key - High School Knowledge Exam...

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High School Knowledge Exam CHEM 1100/1110 Fall 2011 ANSWER KEY (ANSWERS IN RED) 1. If 0.821 atm krypton gas is confined to a 19.2 L container at 29.7 o C, how many moles of krypton gas are present in the container? (R = 0.08206 L atm/mol ∙K) (A) 0.634 moles (B) 1.58 moles (C) 6.47 moles (D) 392 moles (E) 0.100 moles 2. Calculate the molar mass of ammonium nickel sulfate, (NH 4 ) 2 Ni(SO 4 ) 2 . (A) 172.80 g/mol (B) 121.78 g/mol (C) 216.87 g/mol (D) 286.91 g/mol (E) 243.49 g/mol 3. Consider an isotope of samarium, samarium-144, Sm 144 62 . Select the combination which lists the correct atomic number, mass number, and neutron number, respectively. (A) 144, 62, 82 (B) 62, 144, 206 (C) 144, 82, 62 (D) 82, 144, 62 (E) 62, 144, 82 4. Sucrose has the molecular formula C 12 H 22 O 11 . What is the percent of carbon in sucrose by mass? (A) 22.2% (B) 42.1 % (C) 3.47 % (D) 6.48 % (E) 48.9 %
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High School Knowledge Exam CHEM 1100/1110 Fall 2011 ANSWER KEY (ANSWERS IN RED) 5. How many grams of calcium phosphate are needed to form 172 g of calcium silicate? 2Ca 3 (PO 4 ) 2 + 6SiO 2 + 10C → 6CaSIO 3 + P 4 + 10CO (A) 21.5 g (B) 57.3 g (C) 153 g (D) 516 g (E) 1.38 x 10 3 g 6. What is the stoichiometric coefficient in front of H 2 O when the reaction below is balanced with the lowest whole number coefficients? BF 3 + H 2 O → B 2 O 3 + HF (A) 1 (B) 2 (C) 3 (D) 4 (E) 6 7. The chemical equation Fe 2 O 3 (s) + 3CO (g) → 2Fe (s) + 3CO 2 (g) informs us that (A) Fe and CO 2 are formed, but the relative amounts of Fe 2 O 3 , CO, Fe and CO 2 involved in the reaction are a function of reaction conditions. (B) regardless of conditions, 2 moles of Fe and 3 moles of CO 2 are formed by the combination of 1 mole of Fe 2 O 3 and 3 moles of CO. (C)
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HSK Exam Fall 2011 Answer Key - High School Knowledge Exam...

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