2007ConceptExam - 2007 Concept Final 1 Which of the following are strong electrolytes(There is more than one correct answer a b c d e f g h 2 HF

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Page 1 of 11 2007 Concept Final 1. Which of the following are strong electrolytes. (There is more than one correct answer.) a) HF i) H 2 O b) HCl j) ZnCl 2 c) NaCl k) Fe(NO 3 ) 2 d) CH 3 OH l) Ca(OH) 2 e) NaOH m) KI f) K 2 SO 4 n) H 3 PO 4 g) NH 3 o) CH 3 COOH (acetic acid) h) H 2 CO 3 p) C 6 H 12 O 6 (glucose) 2. Consider the following reaction at equilibrium. 2 NH 3 (g) N 2 (g) + 3 H 2 (g) Δ H ° = + 92.4 kJ Adding N 2 (g) to the reaction vessel will a) decrease the concentration of NH 3 (g) at equilibrium. b) decrease the concentration of H 2 (g) at equilibrium. c) increase the value of the equilibrium constant. d) cause the reaction to shift to the right. e) have no effect on the concentration of NH 3 (g). 3. What is the heat of formation of ozone? 3 O 2 (g) 2 O 3 (g) Δ H rxn = 284.6 kJ a) 142.3 kJ b) 284.6 kJ c) 569.2 kJ d) 426.9 kJ e) There is not enough information to determine the answer. 4. How many kJ of heat will evolve when 41 g of HBr is formed in this reaction? H 2 (g) + Br 2 (g) 2 HBr(g) Δ H = 72 kJ a) 0.49 kJ b) 36 kJ c) 71 kJ d) 18 kJ
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Page 2 of 11 5. The following substances are fertilizers that contribute nitrogen to the soil: urea [(NH 2 ) 2 CO]; ammonium nitrate; ammonium sulfate. Arrange these fertilizers in order of decreasing nitrogen content on a mass percentage basis. a) ammonium nitrate > urea > ammonium sulfate b) ammonium nitrate > ammonium sulfate > urea c) urea ammonium sulfate ammonium nitrate d) urea > ammonium nitrate > ammonium sulfate e) ammonium sulfate ammonium nitrate > urea 6. Rank these aqueous solutions in order of increasing freezing point. 0.08 m glucose 0.06 m LiBr 0.03 m Zn(NO 3 ) 2 a) LiBr < Zn(NO 3 ) 2 < glucose b) Zn(NO 3 ) 2 < LiBr < glucose c) glucose < LiBr < Zn(NO 3 ) 2 d) Zn(NO 3 ) 2 < glucose < LiBr e) They all have the same freezing points. 7. What is the molecular geometry of ICl 2 ? a) trigonal planar b) linear c) bent d) trigonal bipyramid e) tetrahedral 8. Which one of the following descriptions of SF 4 and XeF 4 is correct? electron pair geometry molecular geometry polar? 1. trigonal bipyramidal seesaw polar 2. tetrahedral tetrahedral nonpolar 3. octahedral square planar nonpolar 4. octahedral square pyramidal polar a) SF 4 = 4 and XeF 4 = 2 b) SF 4 = 1 and XeF 4 = 4 c) SF 4 = 2 and XeF 4 = 2 d) SF 4 = 1 and XeF 4 = 3 e) SF 4 = 3 and XeF 4 = 1
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Page 3 of 11 9. A solute is dissolved in water. Which one of the following statements is false? a)
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This note was uploaded on 04/16/2009 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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2007ConceptExam - 2007 Concept Final 1 Which of the following are strong electrolytes(There is more than one correct answer a b c d e f g h 2 HF

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