Learning Modules 43-48

All of the following are intermolecular forces exist in different types of molecular compounds. Which of the following exists in all molecules?

• Van der Waals

• Dipole-Dipole

• Hydrogen Bonding

• Ionic

What is the approximate energy contained in a dipole-dipole intermolecular interaction?

• 15 kJ/mol

• 1 kJ/mol

• 200 kJ/mol

• 1500 kJ/mol

Which of the following exhibits hydrogen bonding?

HF, CH3F, CHF3, HCl

• HF only

• HF and HCl

• All 4 Compounds

• HF, CH3F, and CHF3

Surface tension describes

• the inward forces that must be overcome in order to expand the surface area of a
  liquid.

• The resistance to flow of a liquid

• Adhesive forces between molecules

• the forces of attraction between surface molecules of a solvent and the solute
  molecules

Rank the compounds
NH3 , N2 , C2 H6 , NCl3 , H2
in terms of decreasing capillary action in a glass tube.

• NH3 > NCl3 > C2 H6 > N2 > H2

• H2 > N2 > C2 H6 > NCl3 > NH3

• NH3 > N2 > C2 H6 > NCl3 > H2

• NH3 > C2 H6 > N2 > NCl3 > H2

Rank the liquids
I) C6 H6
II) CH3 CH2 OH
III) CH2 OHCHOHCH2 OH
IV) CH2 OHCH2 OH
V) H2 O
in order of increasing viscosity at 25°C.

• I < V < II < IV < III

• II < IV < I < V < III

• IV < V < II < I < III

• I < IV < II < V < III

Which one of the following substances is INCORRECTLY matched with the kind of solid that it forms?

• diamond: molecular

• calcium fluoride: ionic

• iron: metallic

• carbon dioxide: molecular

Which of these is NOT a property of network solids

• Relatively low melting points

• Insoluble in water

• brittle

• rigid

Arrange the following compounds in order from highest to lowest melting point C(s), CO2(s), LiBr(s), MgF2(s)

• C(s) > MgF2(s) > LiBr(s) > CO2(s)

• CO2(s) > MgF2(s) > LiBr(s) > C(s)

• CO2(s) > LiBr(s) > MgF2(s) > C(s)

• C(s) > LiBr(s) > MgF2(s) > CO2(s)

In theory, 1.00 mol of water vapor in a 10.0 L container at 400 K should have pressure of 3.28 atm, according to the ideal gas law. However, the observed pressure is actually 3.24 atm. Which of the following is the best justification for why the observed pressure is slightly less than the predicted value?

• Water molecules experience intermolecular attractive forces with each other.

• Water molecules tend to travel at faster speeds that other gas molecules.

• Water molecules tend to bounce off each other with a large repulsive force.

• Water molecules experience adhesion with the walls of the container.