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6. Polar covalent bonds are caused by

  • electrolysis
  • electrostaticity
  • electronegativity
  • electrodensity

7. In metallic bonding, the outer shell of electrons is delocalised

  • True
  • False

8. Which of these intermolecular forces is strongest?

  • dipole-dipole forces
  • hydrogen bonding
  • van der Waals forces

9. hydrogen bonds form between:

  • hydrogen atoms and atoms with a slight positive charge
  • All of the above
  • two hydrogen atoms
  • slightly positive hydrogen atoms and lone pairs of electrons on very electronegative atoms
  • hydrogen atoms and atoms with a slight negative charge

10. Water expands when frozen due to hydrogen bonding

  • True
  • False

11. Which of the following is a macromolecular structure?

  • Silicon
  • Diamond
  • All of the above
  • Graphite