October 19, 1999 Page 1. Chapter 4 Practice Worksheet Dr. Palmer Graves, Instructor MULTIPLE CHOICE

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1 October 19, 1999 Page 1 MULTIPLE CHOICE Section 4.1 Some Ways that Chemical Reactions Occur 1. The reaction of HNO (aq) + KOH(aq) KNO (aq) + H O(l) is best classified as a(n) a) acid-base neutralization reaction b) oxidation-reduction reaction c) precipitation reaction d) single replacement reaction 2. The reaction of Na PO (aq) + 3 AgNO (aq) Ag PO (s) + 3 NaNO (aq) is best classified as a(n) a) acid-base neutralization reaction b) oxidation-reduction reaction c) precipitation reaction d) single replacement reaction 3. The reaction of C H O (s) + 6 O (g) 6 CO (g) + 6 H O(l) is best classified as a(n) a) acid-base neutralization reaction b) double replacement reaction c) oxidation-reduction reaction d) precipitation reaction Section 4.2 Electrolytes in Aqueous Solution 4. HBr, HCl, HClO, KBr, NaCl are commonly classified as a) acids. b) nonelectrolytes. c) strong electrolytes. d) weak electrolytes. 5. Acetic acid (CH COOH), formic acid (HCOOH), hydrofluoric acid (HF), ammonia (NH ), and methylamine (CH NH ) are commonly classified as a) acids. b) nonelectrolytes. c) strong electrolytes. d) weak electrolytes. 6. Water (H O), methyl alcohol (CH OH), ethyl alcohol (CH CH OH), ethylene glycol (HOCH CH OH), and sucrose (C H O ) are commonly classified as a) bases. b) nonelectrolytes. c) strong electrolytes. d) weak electrolytes.

2 October 19, 1999 Page 2 7. What is the molar concentration of sodium ions in a M Na PO solution? a) M b) M c) 1.05 M d) 1.40 M Section 4.4 Precipitation Reactions and Solubility Rules 8. Write a balanced net ionic equation for the reaction of Pb(NO ) (aq) with NaI(aq). a) Pb(NO ) (aq) + 2 NaI(aq) PbI (s) + 2 NaNO (aq) b) Pb (aq) + 2 NO (aq) + 2 Na (aq) + 2 I (aq) Pb (aq) + 2 I (aq) + 2 Na (aq) + 2 NO (aq) c) Pb (aq) + 2 NO (aq) + 2 Na (aq) + 2 I (aq) PbI (s) + 2 Na (aq) + 2 NO (aq) d) Pb (aq) + 2 I (aq) PbI (s) 9. Which one of the following compounds is insoluble in water? a) K SO b) NaNO c) PbSO d) Rb CO Section 4.3 Aqueous Reactions and Solubility Rules 10. Which pair of compounds is insoluble in water? a) AgNO and KNO b) Na S and CuS c) (NH ) SO and AgI d) PbSO and Pb (PO ) 11. Which pair of compounds is soluble in water? a) AgBr and AgI b) CdS and (NH ) S c) KI and Ba(NO ) d) NaNO and CuCO 12. Which pair of reactants will give a precipitation reaction? a) CsI(aq) + NaOH(aq) b) HCl(aq) + Ca(OH) (aq) c) K SO (aq) + Ba(NO ) (aq) d) NaNO (aq) + NH Cl(aq) 13. What reagent would separate Cl from NO? a) AgNO b) Ba(OH) c) CuSO d) NaI

3 October 19, 1999 Page What reagent would not separate SO from OH? a) AgNO b) Al(NO ) c) Cu(NO ) d) Fe(NO ) Section 4.4 Precipitation Reactions and Solubility Rules 15. Which pair of reactants will produce a precipitate when mixed together? a) HCl(aq) and NaOH(aq) b) HCl(aq) and Na CO (aq) c) HCl(aq) and Na S(aq) d) HCl(aq) and Pb(NO ) (aq) Sections 4.6/4.7 Oxidation - Reduction (Redox) Reactions - Identifying Redox Reactions 16. What is the oxidation number of sulfur in H SO? a) 2 b) 2 c) 4 d) What is the oxidation number change for manganese in the reduction half reaction of MnO (aq) + 8 H (aq) Mn (aq) + 4 H O(l)? a) 7 b) 5 c) 5 d) 7 Section 4.7 Identifying Redox Reactions 18. What is the oxidation half reaction in chemical reaction Cr O (aq) + 6 Cl (aq) + 14 H (aq) 2 Cr (aq) + 3 Cl (aq) + 7 H O(l)? a) Cr O (aq) + 14 H (aq) + 6e 2 Cr (aq) + 7 H O(l) b) Cr O (aq) + 14 H (aq) 2 Cr (aq) + 7 H O(l) + 6e c) 2 Cl (aq) Cl (aq) + 2e d) Cl (aq) + 2e 2 Cl (aq) 19. What is the reduction half reaction for the chemical reaction in a basic solution ClO (aq) + Cr(OH) (aq) CrO (aq) + Cl (aq)? a) ClO (aq) + 2 H (aq) + 2e Cl (aq) + H O(l) b) ClO (aq) + H O(l) + 2e Cl (aq) + 2 OH (aq) c) Cr(OH) (aq) + 4 OH (aq) CrO (aq) + 4 H O(l) + 3e d) Cr(OH) (aq) CrO (aq) + 4 H (aq) + 3e

4 October 19, 1999 Page 4 Section 4.10 Balancing Redox Reactions: The Half-Reaction Method 20. What are the coefficients in front of NO (aq) and Cu(s) when the following redox equation is balanced in an acidic solution: NO (aq) + Cu(s) NO(g) + Cu (aq)? a) 2, 3 b) 2, 6 c) 3, 4 d) 3, Determine the number of water molecules necessary to balance the following chemical equation Cr O (aq) + Cl (aq) + H (aq) Cr (aq) + Cl (g) + H O(l). a) 3 b) 5 c) 7 d) 14 Section 4.11 Redox Titrations 22. According to the balanced chemical equation 5 H C O (aq) + 2 MnO (aq) + 6 H (aq) 10 CO (g) + 2 Mn (aq) + 8 H O(l) one mole of oxalic acid, H C O, is equivalent to moles of permanganate, MnO. a) 1 b) 2 c) 2/5 d) 5/2 (c) 1998 Prentice-Hall, Inc. All rights reserved.

5 ANSWER KEY FOR TEST Chapter 4 Practice October 19, 1999 Page 1 1. a) 2. c) 3. c) 4. c) 5. d) 6. b) 7. c) 8. d) 9. c) 10. d) 11. c) 12. c) 13. a) 14. a) 15. d) 16. d) Chapter: 4 QUESTION: 1 Chapter: 4 QUESTION: 4 Chapter: 4 QUESTION: 6 Chapter: 4 QUESTION: 7 Chapter: 4 QUESTION: 8 Chapter: 4 QUESTION: 9 Chapter: 4 QUESTION: 10 Chapter: 4 QUESTION: 12 Chapter: 4 QUESTION: 19 Chapter: 4 QUESTION: 20 Chapter: 4 QUESTION: 22 Chapter: 4 QUESTION: 23 Chapter: 4 QUESTION: 25 Chapter: 4 QUESTION: 26 Chapter: 4 QUESTION: 31 Chapter: 4 QUESTION: 44

6 ANSWER KEY FOR TEST Chapter 4 Practice October 19, 1999 Page b) 18. c) 19. b) 20. a) 21. c) 22. c) Chapter: 4 QUESTION: 47 Chapter: 4 QUESTION: 53 Chapter: 4 QUESTION: 55 Chapter: 4 QUESTION: 66 Chapter: 4 QUESTION: 70 Chapter: 4 QUESTION: 74 (c) 1998 Prentice-Hall, Inc. All rights reserved.

Chapter 4. The Major Classes of Chemical Reactions 4-1

Chapter 4. The Major Classes of Chemical Reactions 4-1 Chapter 4 The Major Classes of Chemical Reactions 4-1 The Major Classes of Chemical Reactions 4.1 The Role of Water as a Solvent 4.2 Writing Equations for Aqueous Ionic Reactions 4.3 Precipitation Reactions