Models of Chemical Bonding

Models of Chemical Bonding - Models of Chemical Bonding 1....

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Models of Chemical Bonding 1. Which of the following pairs of atoms are least likely to form an ionic compound? a. Ni, O b. Na, F c. Cu, Cl d. Li, Mg e. Li, F 2. The bond in dinitrogen (N 2 ) is a: a. double bond. b. single bond. c. triple bond. d. lone pair. e. none of the above 3. Which of the following formulas are incorrect on the basis of simple Lewis dot structures? a. LiCl b. MgO c. Na 2 O d. CO 2 e. none of these 4. Which of the following bonds is most polar? a. H-F b. H-Cl c. H-H d. F-F e. H-I 5. What type of hybrid orbital is present in methane (CH 4 )? a. sp 2 b. sp 3 c. sp 3 d d. sp e. sp 3 d 2 6. Which of the following molecules requires two resonance hybrid Lewis structures to account for the bonding? a. SO 2 b. CO 2 c. O 2 d. CH 4 e. C 2 H 4 7. The formal oxidation number of nitrogen in ammonia is: a. +3 b. -1 c. -4 d. +1 e. -3 8. The Lewis structure for CO 2 is:
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9. Which of the following pairs of atoms are most likely to form a covalent compound? a. Ni, O b. Na, F c. Cu, Cl d. C, O e. Li, F 10. The number of valence shell electrons in chlorine is: a. 17 b. 2 c. 5 d. 7 e. 4 11. The bond in oxygen (O 2 ) is a: a. double bond. b. single bond. c. triple bond. d. lone pair. e. none of the above 12. Which of the following oxides is ionic? a. XeO 3
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b. Y 2 O 3 c. SO 2 d. N 2 O e. P 2 O 5 13. What is the formal charge on carbon in the preferred structure of CO 2 ? a. 0 b. -1 c. +2 d. -3 e. +4 14. What is the oxidation number of I in NaIO 3 ? a. -1 b. +6 c. +5 d. +4 e. -2 15. Given the following table of bond enthalpies: average bond bond enthalpy (kJ/mol) C-H 413 C-C 348 C-N 293 N-H 391 H-H 436 N-N 163 O-H 463 C=C 614 C-N (triple bond) 891 16. Calculate the H for the following reaction in the gas phase: 17. HCN(g) + 2H 2 (g) --> CH 3 NH 2 (g) a. -736 kJ b. -551 kJ c. -138 kJ d. +230 kJ e. +275 kJ 18. Which of the following IIIA family members should form the fluoride molecule with the highest lattice energy? a. AlF 3 b. GaF 3 c. InF 3 d. TlF 3
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e. TlF 19. In which of the following molecules are the bonds most polar? a. H 2 b. HF c. CH 4 d. NH 3 e. H 2 O 20. Which of the pattern does not obey the octet rule? 21. Which of the following Lewis structures is least plausible?
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22. The total number of electron pairs in the valence shell of Se in an SeF 4 molecule is: a. 4 pairs, all bonding. b. 5 pairs, 4 bonding and 1 non-bonding. c.
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Models of Chemical Bonding - Models of Chemical Bonding 1....

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