Intermolecular forces

Which of the following statements is true?

• Vapour pressure increases with temperature.

• Hydrogen bonds are interatomic bonds.

• Intermolecular forces hold the atoms in a molecule together.

• Dispersion forces are generally stronger than dipole forces.

Which one of the following factors is NOT a consequence of hydrogen bonding between water molecules?

• Water has its greatest density at 4^oC rather than at 0^oC

• Water expands on freezing

• Water has a relatively high boiling point

• An oxygen atom is bonded to two hydrogen atoms in the water molecule.

At normal room temperature ammonia gas will liquefy when under pressure whereas nitrogen gas will not. The type of intermolecular forces found in ammonia and nitrogen respectively are:

• Polar covalent and pure covalent forces.

• Dipole-dipole and temporary dipole forces.

• Hydrogen bonds and London forces.

• Hydrogen bonds and dipole-dipole forces

Which one of the following best describes the attractive forces between iodine molecules in the solid phase?

• Ionic bonding forces

• Covalent bonding forces

• Ion-dipole forces

• London dispersion forces

When noble gases liquefy the forces between the particles can best be classified as:

• London forces

• Dipole-dipole forces

• Hydrogen bonds

• Molecular forces

The intermolecular forces in a crystal of ice are:

• London forces

• Hydrogen bonds

• Covalent bonds

• Polar covalent bonds

Dry ice (solid carbon dioxide) sublimes on heating because the forces are:

• Pure covalent bonds

• Polar covalent bonds

• Forces between temporary dipoles

• Dipole-dipole forces

Which of the following is the best description of an ionic crystal?

• Positive ions sharing electrons with adjacent positive ions

• Alternating positive and negative ions held by electrostatic forces

• Polar molecules kept together by hydrogen bonds

• Atoms held into a giant structure by covalent bonds

Which statement about the boiling point of water is true?

• It increases as the water boils away

• It increases as atmospheric pressure decreases

• It increases as the volume of water increases

• It decreases as atmospheric pressure decreases

Which of the following can act as an electrolyte?

• sugar in water

• salt in water

• sugar in water and salt in water

• salt in water and hydrochloric acid in water