Exam 2-1.2 - of the valence orbitals increases 3. What is...

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EXAM II Sample Exam 2-1 Dr. V. Williamson © Vickie M. Williamson 2007, All Rights Reserved 1. Calculate the percent yield if 0.75 mol of calcium metal is treated with excess HCl and yields 1.4 g of hydrogen gas in the laboratory. The UNBALANCED reaction equation is: Ca + HCl H 2 + CaC1 2 Atomic Molar Masses H =1.0 g/mol Cl = 35.5 g/mol O = 16.0 g/mol A. 93% B. 107% C. 187% D. 82% E. 21.4% 2. Atomic radius for the main-group elements generally increases down a group because: A. effective nuclear charge zigzags down a group B. the principle energy level of the valence orbitals increases C. effective nuclear charge decreases down a group D. effective nuclear charge increases down a group E. both effective nuclear charge increases down a group and the principle energy level
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Unformatted text preview: of the valence orbitals increases 3. What is the coefficient on H 2 O when the following equation is correctly balanced? PCl 3 + H 2 O H 3 PO 3 + HCl A. 5 B. 1 C. 3 D. 2 E. 4 4. Based on the driving forces, which reaction below will not occur? A. Ag(s) + HNO 3 (aq) AgNO 3 (aq) + H 2 (g) B. Cr(OH) 3 (s) + 3HNO 3 (aq) 3H 2 O(l) + Cr(NO 3 ) 3 (aq) C. H 2 SO 4 (aq) + 2KOH(aq) 2H 2 O (l) + K 2 SO 4 (aq) D. 2AgNO 3 (aq) + Pb(s) 2Ag(s) + Pb(NO 3 ) 2 (aq) E. Li 2 CO 3 (aq) + CaCl 2 (aq) 2LiCl (aq) + CaCO 3 (s) Assume Li 2 CO 3 is soluble as indicated. 5. Determine the number of moles of SO 3 that can be produced by the reaction of 10. moles of O 2 with excess S according to the equation shown. 2S(s) + 3O 2 (g) 2SO 3 (g) A. 2.0 B. 3.3 C. 10. D. 6.6 E. 3.0...
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This note was uploaded on 02/18/2012 for the course CHEM 101 taught by Professor Williamson during the Fall '08 term at Texas A&M.

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