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AQA A Level Chemistry- Inorganic chemistry 2024 Exam
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AQA A Level Chemistry- Inorganic chemistry 2024 Exam
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AQA A Level Chemistry- Inorganicchemistry 2024 Exam
Periodic table - Answer>> 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 - Answer>> Decreases
First ionisation energy across Period 3 - Answer>> Increases
Exceptions: Drops at Al and S
Melting points across Period 3 - Answer>> 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 - Answer>> 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 - Answer>> S bigger molecule
So more/stronger van der Waals' forces (to be broken or
overcome)
Atomic radius down Group 2 - Answer>> Increases
First ionisation energy down Group 2 - Answer>> Decreases
, Melting point down Group 2 - Answer>> Decreases
Exception Ca which increases
Explain the melting point of the elements in terms of the structure
and bonding of Group 2 elements - Answer>> 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 - Answer>> Increase down the group
The relative solubilities of the sulfates, XSO4, of the elements Mg-
Ba in water - Answer>> Decrease down the group
The role of magnesium in the extraction of titanium from TiCl4 -
Answer>> Mg is used as a reducing agent
Mg is oxidised to 2+ in MgO when it is heated with TiCl4 to about
1200C in an inert atmosphere
Redox equation of Group 2 elements with water - Answer>>
X(s) + 2H2O(l) -> X2+(aq) +2OH-(aq) + H2(g)
Sparingly soluble Group 2 hydroxide - Answer>> Mg(OH)2
Insoluble Group 2 sulphate - Answer>> BaSO4
The use of acidified BaCl2 solution - Answer>> Test for sulfate
ions
If Barium Chloride is added to a solution that contains sulphate
ions a white precipitate forms (BaSO4)
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