OCR UNIT 1: ELECTRONS, BONDING AND STRUCTURE all included

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1. What are three characteristics that ionic compounds have (when in a giant ionic structure)?

  • conduct electricity when molten or dissolved, have high boiling points, dissolve in water
  • high boiling point, always conducts electricity and cannot dissolve in water
  • dissolve in water, low boiling point, can not conduct electricity
  • always conducts electricity, low boiling point, cannot dissolve in water
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2. What is the definition of the first ionisation energy?

  • the energy needed to remove 1 electron from each atom in 1 mole of gaseous atoms to form one mole of gaseous 1+ ions.
  • the energy needed to remove 1 electron from each ion in 1 mole of gaseous 1+ ions to form one mole of gaseous 2+ ions.
  • a high attraction between the electron and the nucleus
  • the ability to remove all the electrons from the outer shell in an exothermic process

3. What is a covalent bond?

  • 1 shared electron
  • the electrostatic attraction between ions with the same charge
  • a shared pair of electrons
  • the electrostatic attraction between two oppositely charged ions

4. What affects ionisation energy?

  • nuclear charge, distance from nucleus and sheilding
  • distance from the nucleus, shielding and intermolecular forces
  • only nuclear charge
  • the shape and size of an atom

5. What is the equation for the second ionisation of oxygen?

  • O+ (l) -> O2+ (g) + e- (s)
  • O+ (g) -> O2+ (g) + e-
  • O2- (g) -> O2+ (g) + H2O
  • O2+ (g) -> O3+ (g) + e-

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