OCR UNIT 1: ELECTRONS, BONDING AND STRUCTURE all included

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1. What are Van Der Waals Forces?

  • any intermolecular force
  • ionic attraction
  • electrostatic attraction between temporary dipoles and induced dipoles caused by movement of electrons in atoms and molecules.
  • shared pair of electrons
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2. What charge does the Sulfate SO4 ion carry?

  • 2+
  • 2-
  • 4+
  • 4-

3. What is the definition of the first ionisation energy?

  • a high attraction between the electron and the nucleus
  • 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.
  • the ability to remove all the electrons from the outer shell in an exothermic process

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

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

5. What is a covalent bond?

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

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