Quiz 1
Name __________________________
CHEM 210
1. What is the proper Lewis structure of HNO3?
A)
B)
C)
D)
2. How many lone pairs of electrons will be present in the following molecule?
CH3–N=N=N
A) 0
B) 1
C) 2
D) 3
3. In the nitrate ion (NO3-), what is the charge on nitrogen? All electrons are shown.
A) No charge
B) - 1
C) + 1
D) + 2
4. The best Lewis structure for ethyne (C2H2; commonly called “acetylene”) has
A) 2 single bonds, 1 B) 2 double bonds
C) 2 single bonds, 1 D) 2 single bonds, 1
triple bond, and 1
and 2 lone pairs
triple bond, and no
double bond, and 2
lone pair
lone pairs
lone pairs
5. What is the formal charge (FC) of each atom in the following molecule? NH4+
A) FC Hydrogens: 0 B) FC Hydrogens: 0 C) FC Hydrogens: 0 D) FC Hydrogens: 0
FC Nitrogen: 0
FC Nitrogen: -1
FC Nitrogen: +2
FC Nitrogen: +1
6. What is the formal charge (FC) of each atom in the following molecule? BH4B) FC Boron: 0
C) FC Boron: -2
D) FC Boron: -1
A) FC Boron: 0
FC Hydrogen1: +1
FC Hydrogen1: 0
FC Hydrogen1: 0
FC Hydrogen1: 0
FC Hydrogen2: 0
FC Hydrogen2: -1
FC Hydrogen2: 0
FC Hydrogen2: 0
FC Hydrogen3: 0
FC Hydrogen3: 0
FC Hydrogen3: 0
FC Hydrogen3: 0
FC Hydrogen4: 0
FC Hydrogen4: 0
FC Hydrogen4: 0
FC Hydrogen4: 0
7. What is the formal charge (FC) of each atom in the following molecule?
A) FC Carbon: +1
FC Hydrogen1: 0
FC Hydrogen2: 0
FC Hydrogen3: 0
B) FC Carbon: 0
FC Hydrogen1: 0
FC Hydrogen2: 0
FC Hydrogen3: 0
C) FC Carbon: -2
FC Hydrogen1: 0
FC Hydrogen2: 0
FC Hydrogen3: 0
D) FC Carbon: -1
FC Hydrogen1: 0
FC Hydrogen2: 0
FC Hydrogen3: 0
8. How many total resonance structures can be drawn for the following anion (include those without
separation of charge)?
A) 1
B) 2
C) 3
D) 4
9. How many resonance structures can be drawn for the following molecule?
A) 1
B) 2
C) 3
D) 4
10. How many other major contributing resonance structures are possible for the following heterocycle?
A) 2
B) 4
C) 6
D) 8
11. How many energetically equivalent resonance structures exist for the oxalate dianion?
A) 1
B) 2
C) 3
12. What is the electron configuration for oxygen?
A) 1s2 2s2 2p6
B) 1s2 2s2 2p5
C) 1s2 2s2 2p4
D) 4
D) 1s2 2s2 2p3
13. Which of the following compounds does NOT have an octet around the central atom?
A) NH3
B) BH3
C) H3O+
D) NH4+
14. Which of the following statements about an sp hybridized carbon is FALSE?
A) It is divalent
B) It forms bonds
C) It has two p
D) It always forms
that are linear.
orbitals
triple bonds to
carbon.
15. A p orbital has what shape?
A) an oval
B) a sphere
C) a wedge of pie
D) a dumbbell
16. The hybridization of the central carbon in
and the bond angle CCN are
2
A) sp , 180°.
B) sp, 180°.
C) sp2, 120°.
D) sp3, 109°.
17. What are the hybridizations of carbons 1 and 2 respectively in the following structure?
A) sp3 and sp2
B) sp2 and sp3
C) sp3 and sp
D) sp2 and sp2
18. What are the hybridizations of atoms 1 and 2 respectively in the following structure?
A) sp3 and sp2
B) ) sp2 and sp3
C) sp3 and sp
D) sp2 and sp2
19. Identify the orbital hybridization at the two indicated carbons in the molecule below.
A) C1: sp; C2: sp
B) C1: sp2; C2: sp2
C) C1: sp; C2: sp2
D) C1: sp2; C2: sp
20. The geometric shape of acetone, (CH3)2CO, is best described as
A) linear.
B) trigonal planar
C) bent.
21. The correct molecular geometry around oxygen in CH3OCH3 is
A) linear.
B) bent.
C) tetrahedral.
D) trigonal planar
22. Which molecule has the largest dipole moment?
C) H2S
A) HCl
B) CCl4
D) CO2
23. Which molecule has the smallest dipole moment?
A) CO2
B) CHCl3
C) H2O
D) NH3
D) tetrahedral
24. Consider the structure with the electron-pushing arrow:
Which of the following statements is FALSE?
A) The bond
B) The products will
between the tertiary
be a carbon cation
carbon and bromine
and bromine anion
is breaking
C) This process is
called homolytic
cleavage.
D) The C–Br
bonding electrons
become a lone pair
on the bromine
25. What is the product of the curved arrow mechanism shown below?
A)
B) No reaction
C)
D)
26. In this reaction, HNO3 + H2SO4 → HSO4– + H2NO3+ a curved arrow should point
A) from HNO3 to
B) from H2SO4 to
C) from HSO4– to
D) from H2NO3+ to
H2SO4
HNO3
H2NO3+.
HSO4–.
27. For the protonation of acetone, the correct curved arrow mechanism is
B)
C)
D)
A)
KEY: 1. A. 2. D. 3. C. 4. C. 5. D. 6. D. 7. D. 8. D. 9. C. 10. B. 11. D. 12. C. 13. B. 14. D. 15. D. 16. B. 17. A. 18. D. 19. D. 20. B. 21. B. 22. A. 23. A. 24. C. 25. D. 26. A. 27. D.