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Intermolecular forces quiz
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CHEM1810 Tutorial 5Inorganic Chemistry – Structure and Bonding
Intermolecular Forces
For discussion in the week of November 22, 2021
1. Define the following and give an example of each:
a. Ion-dipole forces
b. London dispersion force
c. dipole-dipole attraction
d. hydrogen bond
2. The bond length in HF is 92 pm, and the dipole moment is 1.83 D. Determine the
charge distribution in the molecule.
3. The types of intermolecular forces in a substance are identical whether it is a solid, a
liquid, or a gas. Why then does a substance change phase from a gas to a liquid or to a
solid?
4. Identify the intermolecular forces present in the following solids:
a. CH3CH2OH
b. CH3CH2CH3
c. CH3CH2Cl
5. Explain why each of the following molecules is nonpolar.
6. Account for each of the following observations:
a. IF5 is a polar molecule
b. Heating N2F2 at 373K results in a change from a non-polar to a polar molecule
c. The boiling point of H2O is 100 °C but the boiling point of H2S is only -60°C
7. Arrange the following in order of increasing boiling point, giving detailed reasons for
your answer: He, H2O, Ar, N2, HCl, NaCl.
8. Explain why a hydrogen bond between two water molecules is weaker than a
hydrogen bond between two hydrogen fluoride molecules.
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