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| 1 | |
What is the total number of valence electrons in the hydrogen oxalate ion, HC2O4-? |
| | A) | 30 |
| | B) | 31 |
| | C) | 32 |
| | D) | 34 |
| | E) | 33 |
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| 2 | |
All of the following molecules contain only single bonds except |
| | A) | H2O2 |
| | B) | Cl2 |
| | C) | CH4 |
| | D) | SO2 |
| | E) | H2O |
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| 3 | |
How many resonance forms are required to represent the carbonate ion CO32-? |
| | A) | 1 |
| | B) | 2 |
| | C) | 3 |
| | D) | 4 |
| | E) | more than 4 |
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| 4 | |
Draw a valid Lewis structure for SO2 and use it to deduce the sulfur-oxygen bond order in this compound. |
| | A) | 1 |
| | B) | 2 |
| | C) | 1.5 |
| | D) | 1.33 |
| | E) | 3 |
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| 5 | |
Which contains a carbon with a negative formal charge, when represented by the most common electron-dot structure? |
| | A) | CO |
| | B) | CO2 |
| | C) | CO32- |
| | D) | CH3OH |
| | E) | HCO2H |
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| 6 | |
Which of the following has the lowest formal charge on the central atom, the first atom in the formula? (Assume that the electron-dot formula obeys the octet rule.) |
| | A) | CO32- |
| | B) | NO3- |
| | C) | SO3 |
| | D) | ClO3- |
| | E) | NH4+ |
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| 7 | |
Which of the following elements would you expect most likely to be a central atom with an expanded valence shell? |
| | A) | Ne |
| | B) | P |
| | C) | N |
| | D) | C |
| | E) | B |
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| 8 | |
Why is the energy released upon the combustion of one mole of methane greater than that for one mole of methanol? |
| | A) | Because the amount of energy released is greater when smaller molecules are burned. |
| | B) | Because methanol is more oxidized than methane and combustion is oxidation. |
| | C) | Because methanol is a liquid and methane a gas at room temperature. |
| | D) | Because the balanced reaction for methanol required 2 moles of methanol. |
| | E) | None of the above. |
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| 9 | |
Estimate the standard enthalpy change ΔH° for the reaction below:
C2H6(g) + Cl2(g) → C2H5Cl(g) + HCl(g)
Data: Bond energies in kJ/mol: C-C, 348; C-H, 414; Cl-Cl, 242; C-Cl, 327; H-Cl, 431 |
| | A) | -113 kJ/mol |
| | B) | -68 kJ/mol |
| | C) | -102 kJ/mol |
| | D) | -344 kJ/mol |
| | E) | 276 kJ/mol |
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| 10 | |
Which of the following is not planar? |
| | A) | BCl3 |
| | B) | ClF3 |
| | C) | PCl3 |
| | D) | XeF4 |
| | E) | C2H4 |
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| 11 | |
The shape of H3CF is best described as |
| | A) | linear |
| | B) | planar |
| | C) | pyramidal |
| | D) | tetrahedral |
| | E) | octahedral |
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| 12 | |
In which of the following molecules and ions do the valence electron groups on the first atom in the formula have a trigonal bipyramidal geometry? |
| | A) | NH4+ |
| | B) | SiCl4 |
| | C) | PCl3 |
| | D) | XeF4 |
| | E) | SF4 |
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| 13 | |
Which of the following is not tetrahedral in shape? |
| | A) | CH4 |
| | B) | SO42- |
| | C) | BCl4- |
| | D) | ICl4- |
| | E) | NH4+ |
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| 14 | |
Use VSEPR theory to predict the ideal bond angles around the two carbon atoms in acetaldehyde, CH3CHO. (The first carbon has single bonds to three H atoms and one C atom; the second carbon has single bonds to C and H, and a double bond to O.) |
| | A) | 109°, 109° |
| | B) | 109°, 120° |
| | C) | 120°, 109° |
| | D) | 120°, 90° |
| | E) | 105°, 105° |
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| 15 | |
Which of the following has the largest dipole moment? |
| | A) | CS2 |
| | B) | AsCl3 |
| | C) | SO3 |
| | D) | BF3 |
| | E) | NH4+ |
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