1. © 2014 Pearson Education, Inc. Chapter 9 Chemical Bonding I: The Lewis Model Clicker Questions Allison Soult University of Kentucky

2. © 2014 Pearson Education, Inc. Which of the following compounds has ionic bonding? a)H 2 O b)C 6 H 12 O 6 c)NO 2 d)Al e)CaCO 3

3. © 2014 Pearson Education, Inc. Which of the following compounds has ionic bonding? a)H 2 O b)C 6 H 12 O 6 c)NO 2 d)Al e)CaCO 3

4. © 2014 Pearson Education, Inc. Which of the following compounds will have the highest-magnitude lattice energy value? a)KBr b)NaBr c)LiBr d)RbBr e)All are the same.

5. © 2014 Pearson Education, Inc. Which of the following compounds will have the highest-magnitude lattice energy value? a)KBr b)NaBr c)LiBr d)RbBr e)All are the same.

6. © 2014 Pearson Education, Inc. Which of the following represents the lattice energy for AlCl 3 ? a)Al(s) + 3/2 Cl 2 (g)  AlCl 3 (s) b)Al(s)  Al(g) c)3/2 Cl 2 (g)  3 Cl(g) d)Al 3+ (g) + 3 Cl – (g)  AlCl 3 (s) e)Cl(g) + e –  Cl – (g)

7. © 2014 Pearson Education, Inc. Which of the following represents the lattice energy for AlCl 3 ? a)Al(s) + 3/2 Cl 2 (g)  AlCl 3 (s) b)Al(s)  Al(g) c)3/2 Cl 2 (g)  3 Cl(g) d)Al 3+ (g) + 3 Cl – (g)  AlCl 3 (s) e)Cl(g) + e –  Cl – (g)

8. © 2014 Pearson Education, Inc. Which of the following has the more electronegative atom written first? a)Br, Cl b)S, F c)P, Si d)O, S

9. © 2014 Pearson Education, Inc. Which of the following has the more electronegative atom written first? a)Br, Cl b)S, F c)P, Si d)O, S

10. © 2014 Pearson Education, Inc. Rank the following in order of increasing bond polarity: H─FH─BrF─FNa─Cl a)H─F < H─Br < F─F < Na─Cl b)F─F < H─F < H─Br < Na─Cl c)H─Br < H─F < F─F < Na─Cl d)F─F < H─Br < H─F < Na─Cl e)Na─Cl < H─F < H─Br < F─F

11. © 2014 Pearson Education, Inc. a)H─F < H─Br < F─F < Na─Cl b)F─F < H─F < H─Br < Na─Cl c)H─Br < H─F < F─F < Na─Cl d)F─F < H─Br < H─F < Na─Cl e)Na─Cl < H─F < H─Br < F─F Rank the following in order of increasing bond polarity: H─FH─BrF─FNa─Cl

12. © 2014 Pearson Education, Inc. Calculate the percent ionic character of a diatomic molecule with a bond length of 145 pm that has a dipole moment of 5.2 D. a)52 % b)45 % c)75 % d)70 % e)85 %

13. © 2014 Pearson Education, Inc. Calculate the percent ionic character of a diatomic molecule with a bond length of 145 pm that has a dipole moment of 5.2 D. a)52 % b)45 % c)75 % d)70 % e)85 %

14. © 2014 Pearson Education, Inc. Draw the best Lewis structure for XeI 2. How many lone pairs of electrons are on Xe? a)0 b)1 c)2 d)3 e)4

15. © 2014 Pearson Education, Inc. Draw the best Lewis structure for XeI 2. How many lone pairs of electrons are on Xe? a)0 b)1 c)2 d)3 e)4

16. © 2014 Pearson Education, Inc. What is the best Lewis structure for CS 2 ? a) b) c) d)

17. © 2014 Pearson Education, Inc. What is the best Lewis structure for CS 2 ? a) b) c) d)

18. © 2014 Pearson Education, Inc. Draw the best Lewis structure for NO 3 –. How many equivalent resonance structures can be drawn? a)1 b)2 c)3 d)4 e)5

19. © 2014 Pearson Education, Inc. Draw the best Lewis structure for NO 3 –. How many equivalent resonance structures can be drawn? a)1 b)2 c)3 d)4 e)5

20. © 2014 Pearson Education, Inc. Determine the formal charge of chlorine in the most stable Lewis structure for ClO 2 –. a)–2 b)–1 c)0 d)+1 e)+2

21. © 2014 Pearson Education, Inc. Determine the formal charge of chlorine in the most stable Lewis structure for ClO 2 –. a)–2 b)–1 c)0 d)+1 e)+2

22. © 2014 Pearson Education, Inc. Which of the following sets gives the correct formal charges for the elements in the Lewis structure below? a)S: –2C: –4 N: –3 b)S: +6C: +4 N: +5 c)S: –2C: –4 N: –3 d)S: +1C: 0 N: –1 e)S: 0C: 0 N: –1

23. © 2014 Pearson Education, Inc. Which of the following sets gives the correct formal charges for the elements in the Lewis structure below? a)S: –2C: –4 N: –3 b)S: +6C: +4 N: +5 c)S: –2C: –4 N: –3 d)S: +1C: 0 N: –1 e)S: 0C: 0 N: –1

24. © 2014 Pearson Education, Inc. Based on formal charges, which structure of hydrogen cyanide is the most stable? a) b) c) d)

25. © 2014 Pearson Education, Inc. Based on formal charges, which structure of hydrogen cyanide is the most stable? a) b) c) d)

26. © 2014 Pearson Education, Inc. Which of the following has a Lewis structure that is an EXCEPTION to the octet rule? a)CO 2 b)ClO 2 – c)I 3 – d)NH 3 e)C 2 H 4

27. © 2014 Pearson Education, Inc. Which of the following has a Lewis structure that is an EXCEPTION to the octet rule? a)CO 2 b)ClO 2 – c)I 3 – d)NH 3 e)C 2 H 4

28. © 2014 Pearson Education, Inc. Which of the following statements is NOT true about the best Lewis structure for PF 5 ? a)Phosphorus is the central atom. b)It contains only single bonds. c)It violates the octet rule. d)There are an odd number of electrons. e)All of the statements are true.

29. © 2014 Pearson Education, Inc. a)Phosphorus is the central atom. b)It contains only single bonds. c)It violates the octet rule. d)There are an odd number of electrons. e)All of the statements are true. Which of the following statements is NOT true about the best Lewis structure for PF 5 ?

30. © 2014 Pearson Education, Inc. a)+1359 kJ b)–1359 kJ c)+2428 kJ d)–2428 kJ e)–510 kJ Using average bond energies, calculate ΔH rxn for the combustion of acetylene. Bond Bond Energy (kJ/ mol) C─H414 C─C347 C≡C837 O═O498 C═O in CO 2 799 O─H464

31. © 2014 Pearson Education, Inc. a)+1359 kJ b)–1359 kJ c)+2428 kJ d)–2428 kJ e)–510 kJ Using average bond energies, calculate ΔH rxn for the combustion of acetylene. Bond Bond Energy (kJ/ mol) C─H414 C─C347 C≡C837 O═O498 C═O in CO 2 799 O─H464

32. © 2014 Pearson Education, Inc. Which of the following statements is true of an endothermic reaction? a)Strong bonds break and weak bonds form. b)Weak bonds break and strong bonds form. c)The bonds that break and those that form are of approximately equal strength. d)An endothermic reaction does not depend on the bond strength of its components.

33. © 2014 Pearson Education, Inc. Which of the following statements is true of an endothermic reaction? a)Strong bonds break and weak bonds form. b)Weak bonds break and strong bonds form. c)The bonds that break and those that form are of approximately equal strength. d)An endothermic reaction does not depend on the bond strength of its components.

34. © 2014 Pearson Education, Inc. Use average bond energies to determine ΔH rxn for the burning of H 2. H 2 (g) + ½ O 2 (g) → H 2 O(g) a)6 kJ b)470 kJ c)–243 kJ d)–350 kJ e)–421 kJ Bond Bond Energy (kJ/mol) H─H436 O═O498 O─O142 O─H464

35. © 2014 Pearson Education, Inc. Use average bond energies to determine ΔH rxn for the burning of H 2. H 2 (g) + ½ O 2 (g) → H 2 O(g) a)6 kJ b)470 kJ c)–243 kJ d)–350 kJ e)–421 kJ Bond Bond Energy (kJ/mol) H─H436 O═O498 O─O142 O─H464

36. © 2014 Pearson Education, Inc. Estimate the enthalpy change for the combustion of methanol, using bond energies. a)–3454 kJ b)2652 kJ c)–1426 kJ d)126 kJ e)–802 kJ

37. © 2014 Pearson Education, Inc. Estimate the enthalpy change for the combustion of methanol, using bond energies. a)–3454 kJ b)2652 kJ c)–1426 kJ d)126 kJ e)–802 kJ