Page 1. Exam 2 Review Summer A 2002 MULTIPLE CHOICE. 1. Consider the following reaction: CaCO (s) + HCl(aq) CaCl (aq) + CO (g) + H O(l)

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1 Page 1 MULTIPLE CHOICE 1. Consider the following reaction: CaCO (s) + HCl(aq) CaCl (aq) + CO (g) + H O(l) The coefficient of HCl(aq) in the balanced reaction is. a) 1 b) 2 c) 3 d) 4 e) 0 2. Given the information below, calculate the weighted average atomic mass (amu) of the element X. Isotope Abundance (%) Mass(amu) X X X a) b) c) d) e) What is the mass % of carbon in dimethylsulfoxide, C H SO? a) 60.0 b) 20.6 c) 30.7 d) 7.74 e) How many molecules of CH are in 48.2 g of this compound? a) b) 3.00 c) d) e) A compound containing only carbon, hydrogen, and oxygen was analyzed and found to contain 70.6% carbon, 5.9% hydrogen, and 23.5% oxygen, by mass. The molecular weight of the compound is 136 amu. What is the molecular formula? a) C H O b) C H O c) C H O d) C H O e) C H O

2 Page 2 6. A compound was found to contain 38.7% potassium, 13.9% nitrogen, and 47.4% oxygen, by mass. What is the empirical formula of the compound? a) KNO b) K N O c) KNO d) K NO e) P NO 7. How many grams of N are required to completely react with 9.3 g of H according to the following equation? N + 3H 2NH a) b) 2.0 c) 43 d) e) What mass (g) of carbon dioxide will be produced by the complete combustion of g of C H O? a) b) c) d) e) What mass (g) of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 g of water? Be sure to balance the reaction. Mg + H O Mg(OH) + H a) b) c) d) e) C H burns in O to produce CO and H O according to the following equation: C H + 3O 2CO + 2H O How many grams of CO will be formed when 3.0 g of C H reacts with 3.0 g of O? a) 2.8 b) 4.1 c) 6.2 d) 9.4 e) 6.0

3 Page The reaction of 1.0 g of sulfur with 1.0 g of oxygen according to the reaction below produced 0.80 g of sulfur trioxide. The yield of sulfur dioxide was %. 2S + 3O 2SO a) 30 b) 296 c) 21 d) 88 e) Which of the following are strong electrolytes? 1. HCl 2. HC H O 3. NH 4. KCl a) 1 & 4 b) 1, 3, & 4 c) 1, 2, 3, & 4 d) 1, 2, & 4 e) 2 & Combining aqueous solutions of BaI and K SO affords a precipitate of BaSO. Which ion(s) is/are spectator ions in the reaction? a) Ba only b) K only c) Ba and SO d) K and I e) SO and I 14. When H SO is neutralized by KOH in aqueous solution, the net ionic equation is. a) SO (aq) + 2K (aq) K SO (aq) b) SO (aq) + 2K (aq) K SO (s) c) H (aq) + OH (aq) H O(l) d) H SO (aq) + 2OH (aq) 2H O(l) + SO (aq) e) 2H (aq) + 2KOH(aq) 2H O(l) + 2K (aq) 15. When aqueous solutions of are mixed, a precipitate forms. a) NiBr and AgNO b) NaI and KBr c) K SO and CrCl d) KOH and Ba(NO ) e) Li CO and CsI 16. Which one of the following compounds is insoluble in water? a) Na CO b) K SO c) Fe(NO ) d) ZnS e) Ag CO

4 Page With which of the following will ammonium ion form an insoluble salt? a) chloride b) sulfate c) carbonate d) sulfate and carbonate e) none of these 18. Which one of the following is a weak acid? a) HNO b) HCl c) HI d) HF e) HClO 19. Ammonia is a. a) strong base b) weak base c) weak acid d) strong acid e) salt 20. A neutralization reaction between an acid and a metal hydroxide produces. a) water and a salt b) hydrogen gas c) oxygen gas d) sodium hydroxide e) ammonia 21. The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is. a) HNO (aq) + Sr(OH) (aq) Sr(NO ) (aq) + H (g) b) HNO (aq) + Sr(OH) (aq) H O(l) + Sr(NO ) (aq) c) HNO (aq) + SrOH(aq) H O(l) + SrNO (aq) d) 2HNO (aq) + Sr(OH) (aq) 2H O(l) + Sr(NO ) (aq) e) 2HNO (aq) + Sr(OH) (aq) Sr(NO ) (aq) + 2H (g) 22. Which of the following is an oxidation-reduction reaction? a) Cu(s) + 2AgNO (aq) 2Ag(s) + Cu(NO ) (aq) b) HCl(aq) + NaOH(aq) H O(l) + NaCl(aq) c) AgNO (aq) + HCl(aq) AgCl(s) + HNO (aq) d) Ba(C H O ) (aq) + Na SO (aq) BaSO (s) + 2NaC H O (aq) e) H CO (aq) + Ca(NO ) (aq) 2HNO (aq) + CaCO (s) 23. What is the concentration (M) of sodium ions in 4.57 L of a M Na P solution? a) b) 3.87 c) d) 2.54 e) 0.282

5 Page A M K SO solution is produced by. a) dilution of ml of 1.00 M K SO to 1.00 L b) dissolving 43.6 g of K SO in water and diluting to a total volume of ml c) diluting 20.0 ml of 5.00 M K SO solution to ml d) dissolving 20.2 g of K SO in water and diluting to ml, then diluting 25.0 ml of this solution to a total volume of ml e) dilution of 1.00 ml of 250 M K SO to 1.00 L 25. How many grams of H PO are in 175 ml of a 3.5 M solution of H PO? a) 0.61 b) 60 c) 20 d) 4.9 e) What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 ml of solution? a) 18 b) 0.16 c) 0.45 d) 27 e) There are mol of bromide ions in L of a M solution of AlBr. a) b) c) d) e) An aqueous ethanol solution (400 ml) was diluted to 4.00 L, giving a concentration of M. The concentration of the original solution was M. a) b) c) 2.00 d) 1.60 e) What volume (ml) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to 200 ml to make a 0.88 M solution of sodium hydroxide? a) 2.64 b) 176 c) 26.4 d) 29.3 e) In a titration of ml of M H SO, ml of a M KOH solution is required for neutralization. a) 35.0 b) 1.12 c) 25.8 d) 62.4 e) 39.3

6 Page A 25.5 ml aliquot of HCl(aq) of unknown concentration was titrated with M NaOH(aq). It took 51.2 ml of the base to reach the endpoint of the titration. What was the concentration (M) of the acid? a) 1.02 b) c) d) e) is reduced in the following reaction. Cr O + 6S O + 14H 2Cr + 3S O + 7H O a) Cr O b) S O c) H d) Cr e) S O 33. is the oxidizing agent in the reaction below. Cr O + 6S O + 14H 2Cr + 3S O + 7H O a) Cr O b) S O c) H d) Cr e) S O 34. Which one of the following reactions is a redox reaction? a) NaOH + HCl NaCl + H O b) Pb + 2Cl PbCl c) AgNO + HCl HNO + AgCl d) HCl + NaOH H O + NaCl e) none of these is a redox reaction. 35. What is the oxidation state of manganese in the permanganate ion? a) +1 b) +2 c) +5 d) +4 e) +7 SHORT ANSWER 36. Balance the following redox reaction in acidic solution. H PO + HNO N O + HPO 37. Balance the following redox reaction in acidic solution. HClO + MnO Cl + MnO (c) 2000 Prentice-Hall, Inc. All rights reserved.

7 ANSWER KEY FOR TEST UNTITLED Page 1 1. b 2. b 3. c 4. d 5. a 6. a 7. c 8. a 9. a 10. a 11. e 12. a 13. d 14. c 15. a 16. d Chapter: 3 QUESTION: 10 Chapter: 3 QUESTION: 57 Chapter: 3 QUESTION: 72 Chapter: 3 QUESTION: 93 Chapter: 3 QUESTION: 124 Chapter: 3 QUESTION: 127 Chapter: 3 QUESTION: 152 Chapter: 3 QUESTION: 157 Chapter: 3 QUESTION: 162 Chapter: 3 QUESTION: 168 Chapter: 3 QUESTION: 175 Chapter: 4 QUESTION: 8 Chapter: 4 QUESTION: 12 Chapter: 4 QUESTION: 17 Chapter: 4 QUESTION: 24 Chapter: 4 QUESTION: 25

8 ANSWER KEY FOR TEST UNTITLED Page e 18. d 19. b 20. a 21. d 22. a 23. d 24. c 25. b 26. c 27. c 28. a 29. d 30. d 31. e 32. a Chapter: 4 QUESTION: 30 Chapter: 4 QUESTION: 41 Chapter: 4 QUESTION: 48 Chapter: 4 QUESTION: 51 Chapter: 4 QUESTION: 53 Chapter: 4 QUESTION: 69 Chapter: 4 QUESTION: 76 Chapter: 4 QUESTION: 77 Chapter: 4 QUESTION: 80 Chapter: 4 QUESTION: 81 Chapter: 4 QUESTION: 84 Chapter: 4 QUESTION: 90 Chapter: 4 QUESTION: 100 Chapter: 4 QUESTION: 109 Chapter: 4 QUESTION: 122 Chapter: 20 QUESTION: 2

9 ANSWER KEY FOR TEST UNTITLED Page b 34. e 35. e 36. H PO + 2 H + 2 e H PO + H O 2 HNO N O + 2 H + 2 e Chapter: 20 QUESTION: 3 Chapter: 20 QUESTION: 6 Chapter: 20 QUESTION: 14 H PO + 2 HNO N O + H PO + H O HClO + 6 H + 6 e Cl + 4H O 2(MnO + 2H O MnO + 4 H + 3 e ) Chapter: 20 QUESTION: 18 2 HClO + 2 MnO Cl + 2 MnO + 2H Chapter: 20 QUESTION: 19 (c) 2000 Prentice-Hall, Inc. All rights reserved.

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