1) A molecule with a trigonal bipyramidal molecular geometry has a bond angle of
- A) <120° for equatorial bonds and <90° for axial bonds.
- B) 180°.
- C) <90°.
- D) 120° for equatorial bonds and 90° for axial bonds.
- E) 120°.
2) If an oil tanker leaks oil in the ocean, where does the oil go?
- A) The oil floats on the seawater; water is polar and oil is nonpolar.
- B) The oil mixes with the water.
- C) The oil sinks below the seawater; water is nonpolar and oil is polar.
- D) The oil floats on the seawater; water is nonpolar and oil is polar.
- E) The oil sinks below the seawater; water is polar and oil is nonpolar.
3) Soap works with water because
- A) the polar head and the nonpolar tail attracts water.
- B) the polar head attracts the grease and the nonpolar tail attracts water.
- C) the polar head attracts water and the nonpolar tail attracts the grease.
- D) the polar head and the nonpolar tail attracts the grease.
4) Identify the number of electron groups around a molecule with sp hybridization.
- A) 1
- B) 2
- C) 3
- D) 4
- E) 5
5) Identify the number of electron groups around a molecule with sp2 hybridization.
- A) 1
- B) 2
- C) 3
- D) 4
- E) 5
6) Identify the number of electron groups around a molecule with sp3 hybridization.
- A) 1
- B) 2
- C) 3
- D) 4
- E) 5
7) Select the best Lewis structure for acetone, CH3COCH3.
| A) | |
| B) | |
| C) | |
| D) | |
| E) |
8) Which of the following compounds contains only one unshared pair of valence electrons?
| A) | NH3 |
| B) | H2O |
| C) | CH4 |
| D) | NaCl |
9) In the Lewis structure for elemental nitrogen there is (are)
| A) | a single bond between the nitrogens |
| B) | a double bond between the nitrogens |
| C) | a triple bond between the nitrogens |
| D) | three unpaired electrons |
| E) | none of the above |
10) Which of the following does not contain at least one pi bond?
| A) | H2CO |
| B) | CO2 |
| C) | C2H4 |
| D) | C2H6 |
| E) | All of the above (A-D) contain at least one pi bond. |
11) Consider the following Lewis structure:
Which statement about the molecule is false?
| A) | There are 10 sigma and 2 pi bonds. |
| B) | C-2 is sp2 hybridized with bond angles of 120°. |
| C) | Oxygen is sp3 hybridized. |
| D) | This molecule contains 28 valence electrons. |
| E) | There are some H–C–H bond angles of about 109° in the molecule. |
12) Consider the following Lewis structure:
What is the hybridization of the atoms O, C-1, C-2, and C-4?
| A) | sp3 sp3 sp sp2 |
| B) | sp sp3 sp sp |
| C) | sp sp2 sp sp2 |
| D) | sp2 sp3 sp2 sp3 |
| E) | sp3 sp sp sp2
O C-1 C-2 C-4 |
13) Consider the molecule and the following hybridization choices:
What is the hybridization of the carbon atom that is double-bonded to oxygen?
| A) | sp |
| B) | sp2 |
| C) | sp3 |
| D) | dsp3 |
| E) | d2sp3 |
14) What is the hybridization of the carbon atom that is bonded to chlorine?
| A) | sp |
| B) | sp2 |
| C) | sp3 |
| D) | dsp3 |
| E) | d2sp3 |
15) What is the hybridization of the nitrogen atom?
| A) | sp |
| B) | sp2 |
| C) | sp3 |
| D) | dsp3 |
| E) | d2sp3 |
16) What is the hybridization of the oxygen atom?
| A) | sp |
| B) | sp2 |
| C) | sp3 |
| D) | dsp3 |
| E) | d2sp3 |
17) Complete the Lewis structure for the following molecule:
This molecule has __________ sigma and __________ pi bonds.
| A) | 4, 5 |
| B) | 6, 3 |
| C) | 11, 5 |
| D) | 13, 2 |
| E) | 13, 3 |
18) Which of the following substances contains two pi bonds?
| A) | C2H4 |
| B) | C3H8 |
| C) | C2H2 |
| D) | C2H6 |
| E) | CH4 |
19) Describe a pi bond.
- A) side by side overlap of p orbitals
- B) end to end overlap of p orbitals
- C) s orbital overlapping with the end of a p orbital
- D) overlap of two s orbitals
- E) p orbital overlapping with a d orbital
20) Describe a sigma bond.
- A) side by side overlap of p orbitals
- B) end to end overlap of s orbitals
- C) s orbital overlapping with the side of a p orbital
- D) overlap of two f orbitals
- E) p orbital overlapping with a d orbital