AQA A Level Chemistry- Inorganic Chemistry Practice Questions and Answers

Periodic table Table that provides chemists with a structural organisation of the known chemical elements that can be used to deduce physical and chemical properties Atomic radius across Period 3 Decreases First ionisation energy across Period 3 Increases Exceptions: Drops at Al and S Melting points across Period 3 Increases from Na to Si Decreases from Si to Ar Small rise at S Explain why the melting point of aluminium is higher than the melting point of sodium Bigger charge (3+ compared to 1+) More free/delocalised electrons Stronger metallic bonding/stronger (electrostatic) attraction between the ions electrons Explain why the melting point of sulfur is higher than the melting point of phosphorus S bigger molecule So more/stronger van der Waals' forces (to be broken or overcome) Atomic radius down Group 2 Increases First ionisation energy down Group 2 Decreases Melting point down Group 2 Decreases Exception Ca which increases Explain the melting point of the elements in terms of the structure and bonding of Group 2 elements Be and Mg have hexagonal close packed structures Ca, Sr and Ba have cubic structures The relative solubilities of the hydroxides, X(OH)2, of the elements Mg-Ba in water Increase down the group The relative solubilities of the sulfates, XSO4, of the elements Mg-Ba in water Decrease down the group