HW2_Chem 2010 F23 1. What is the formal charge on oxygen in the following structure? H :0-I H-C-O-H H A. 2- B. 1- C. 2+ D. 1+ E. 0 2. What is the formal charge on nitrogen in the following structure? H H-C H / H C=N H 1 H A. 2- B. 1- C. 2+ D. 1+ E. 0 3. Which of the following structures have a 1- formal charge on the sulfur atom? H H-C-S: H H- I-O-I -S-C- -H 1 A. I B. C. III = H S O E :Ö: I-O-I H H-C-S-H H-O-S-O-H O : IV V
D. IV E. V 4. What are the formal charges on boron and oxygen in the following structure? .. H. H :F: C-H :F. B-Q: :F .: GH H H A. B = 1-, O = 1- B. B = 1-, O = 1+ C. B = 1+, O = 1+ D. B = 1+, O = 1- E. B = 1-, O = 0 5. What is the correct Lewis structure for nitric acid, HNO3, including the formal charges? . · H. O=z 0-0 + ++ H O H. Z O H 0 `N O O: I = = IV A. I B. = C. = D. IV E. None of these 6. Which of the following compounds has the lowest pKa ? NH K OH OH A B X NH2 C D
7. Which of the following compounds is not a Lewis base? -OCH3 ·OH -NH2 A B -CI C D 8. Which of the following species is amphoteric? OH + NH3 CI CI LCI CI- CI CI A B C D 9. Which of the following anions is the strongest base? E H3CO O F H3CCH2 ? H3CNH A B C D NONE E 10. Draw the curved arrow notation, identify the acid and base, and complete the reaction in the following. (a) CI3CCOOH + HOCH3 (b) CH3CH2CH2-Li + H-CEC-H F (c) F-B 1 F + NaOH (d) CH3 OFGEO 0 S-O-H + N(CH3)3