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Worksheet: Intermolecular Interactions of Solids, Liquids and Gases

Q1:

Which of the following statements is false?

  • AWhen a liquid freezes, heat energy is released.
  • BThe average kinetic energy of molecules in a gas increases linearly with temperature.
  • CExpansion of a liquid is opposed by intermolecular interactions.
  • DWhen a solid sublimes, heat energy is released.
  • EChanges in the shape of a solid are opposed by intermolecular interactions.

Q2:

Boron nitride contains alternating boron and nitrogen atoms in the same arrangement as the carbon atoms of graphite. How does the hardness of boron nitride compare with that of graphite?

  • ABoron nitride and graphite are similarly hard because the interatomic forces in these materials do not differ greatly in energy.
  • BBoron nitride is less hard because 𝛿 + boron and 𝛿 βˆ’ nitrogen atoms repel atoms of like charge in adjacent layers.
  • CBoron nitride is harder because the boron-nitrogen bond is stronger than the carbon-carbon bond.
  • DBoron nitride is harder because 𝛿 + boron and 𝛿 βˆ’ nitrogen atoms attract atoms of opposite charge in adjacent layers.
  • EBoron nitride is less hard because the boron-nitrogen bond is weaker than the carbon-carbon bond.

Q3:

Which of the following statements is false?

  • ASublimation always increases the compressibility of a material.
  • BBoiling decreases the density of a material.
  • CFreezing increases the elastic modulus of a material.
  • DMelting always decreases the compressibility of a material.
  • EFreezing usually decreases the volume of a material.