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6. What is the equation for the second ionisation of oxygen?
- O+ (g) -> O2+ (g) + e-
- O+ (l) -> O2+ (g) + e- (s)
- O2+ (g) -> O3+ (g) + e-
- O2- (g) -> O2+ (g) + H2O
7. What is dative covalent bonding?
- When both electrons come from one atom
- When atoms share more than one pair of electron e.g. in N2
- When there are more than 8 electrons in outer shell
- When there are less than 8 electrons in outer shell
8. 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
9. What is a covalent bond?
- 1 shared electron
- a shared pair of electrons
- the electrostatic attraction between two oppositely charged ions
- the electrostatic attraction between ions with the same charge
10. What charge does the Sulfate SO4 ion carry?