Embed Size (px)
Citation preview
Practice test 1 CHM2210C Ch 1-2
1. What is the relationship between the following compounds?
a. They are isotopes b. They are constitutional isomers c. They are the same structure d. They are composed of different elements e. There is no relationship
2. Draw three constitutional isomers that have molecular formula
C4H8BrCl.
3. What is the correct Lewis structure for COCl2?
a. I b. II c. III d. IV e. V
4. What is the formal charge on oxygen in the following structure?
a. 2- b. 1-
c. 2+ d. 1+ e. 0
5. What is the correct Lewis structure for nitric acid (HNO3) including
the formal charges?
a. I b. II c. III d. IV e. None of these
6. Which of the following is the least electronegative element?
a. B b. C c. N d. O e. F
7. For the following compound identify the polar covalent bonds and
indicate the direction of dipole moment using d+ and d-.
8. What is the hybridization state of the oxygen atom in the following
compound?
a. sp
b. sp2
c. sp3
d. sp3d
e. s2p
9. Which of the following best describes the orbitals involved in the
formation of C=O bond in acetone, shown below?
a.
b.
c.
d.
e.
10. For the hydrogen halides, which is the correct sequence for a) the
molecule with the weakest bond, b) the molecule with the shortest bond,
and c) the molecule with the most polar bond?
a. HF HI HBr b. HI HBr HCl c. HBr HI HF d. HI HF HF e. HCl HBr HI
11. Which of the following compounds have trigonal pyramidal molecular
geometry?
a. I b. II c. III d. IV e. I & IV
12. Which of the following compounds have a dipole moment? Indicate the
direction of dipole moment.
13. Which of the intermolecular forces listed below is generally
considered the strongest?
a. London dispersion forces b. Fleeting dipole-dipole interactions c. Dipole-dipole interactions d. Hydrogen bonding e. The Vital force
14. Which of the following compounds have a higher boiling point?
Explain why.
15. What is the molecular formula for the following compound?
a. C2H6O
b. C4H6O
c. C4H10O
d. C2H4O
e. None of these
16. Which of the following is the correct condensed structure for the
following compound?
a. CH3CH3CH2OH
b. CH3CH2CH2OH
c. (CH3)2CHCH2OH
d. CH3CH2CH2OCH3
e. CH3C2H3CH3OH
17. Provide correct condensed structure for the following compound.
18. Which of the following is the correct Lewis structure for
CH3(CH2)2NH2?
a. I b. II c. III d. IV
e. Both II & III
19. Which of the following bond-line structures are of the same
compound?
a. I & II b. II & III c. III & IV d. II & IV e. None of these
20. How many H atoms are connected to the indicated carbon atom?
a. one b. two c. three d. four e. none
21. Which of the following is the correct bond-line structure for
(CH3)4C?
a. I b. II c. III d. IV e. None of these
22. Draw all lone pairs of electrons for the following compound.
23. The indicated bond in the following compound is _____ of the paper.
a. in the plane b. out of the plane c. behind the plane d. none of these
24. Which of the following pairs are resonance structures of each
other?
a. I b. II c. III d. IV e. None of these
25. Draw the curved arrow(s) for converting the first resonance
structure into the second resonance structure.
26. Draw resonance structures for the following compound.
27. Which of the following is/are the most significant resonance
structure(s)?
a. I b. II c. III d. II & III e. all of these
1. Provide a definition of a Brønsted-Lowry acid.
2. For the following reaction, which reactant functions as a base?
a. I b. II c. neither
3. What is the conjugate base of nitric acid?
a. NO3-
b. NO2-
c. HNO3
d. HNO2
e. None of these
4. Draw the conjugate base of CH3CºCH.
5. For the following reaction label the acid, base, conjugate acid and
conjugate base.
6. Which of the following compounds is most acidic?
a. I b. II c. III d. IV e. None of these
7. For the following acid-base reaction, predict which side the
equilibrium is favored.
a. favor right side b. favor left side
c. neither
8. A Lewis acid is defined as _____.
a. a proton donor b. an electron pair donor c. a hydroxide donor d. an electron pair acceptor
Answer Key:
1. b.
2.
There are additional correct answers. 3. b.
4. d.
5. d.
6. a.
7. 8. c.
9. b.
10. d.
11. d.
12. Compound I has no dipole moment.
Compound II has dipole moment.
13. d.
14. Compound II has a higher boiling point than compound I.
Compound II has larger surface area that allows for stronger fleeting
dipole-dipole interactions between molecules.
15. c.
16. c.
17. (CH3)2N(CH2)3CH(CH3)2
18. c.
19. d.
20. a.
21. c.
22. 23. b.
24. d.
25.
26. 27. c.
Answers:
1. A Brønsted-Lowry acid is a proton donor.
2. b.
3. a.
4.
5.
6. b.
7. a.
8. d.
