AQA A Level Chemistry- Inorganic chemistry
Study online at https://quizlet.com/_4vr459
1. Periodic table Table that provides chemists with a structural
organisation of the known chemical elements
that can be used to deduce physical and chem-
ical properties
2. Atomic radius across Period 3 Decreases
3. First ionisation energy across Period 3 Increases
Exceptions: Drops at Al and S
4. Melting points across Period 3 Increases from Na to Si
Decreases from Si to Ar
Small rise at S
5. Explain why the melting point of alu- Bigger charge (3+ compared to 1+)
minium is higher than the melting point More free/delocalised electrons
of sodium Stronger metallic bonding/stronger (electro-
static) attraction between the ions electrons
6. Explain why the melting point of sulfur S bigger molecule
is higher than the melting point of phos- So more/stronger van der Waals' forces (to be
phorus broken or overcome)
7. Atomic radius down Group 2 Increases
8. First ionisation energy down Group 2 Decreases
9. Melting point down Group 2 Decreases
Exception Ca which increases
10. Explain the melting point of the ele- Be and Mg have hexagonal close packed struc-
ments in terms of the structure and tures
bonding of Group 2 elements Ca, Sr and Ba have cubic structures
, AQA A Level Chemistry- Inorganic chemistry
Study online at https://quizlet.com/_4vr459
11. The relative solubilities of the hydrox- Increase down the group
ides, X(OH)2, of the elements Mg-Ba in
water
12. The relative solubilities of the sulfates, Decrease down the group
XSO4, of the elements Mg-Ba in water
13. The role of magnesium in the extraction Mg is used as a reducing agent
of titanium from TiCl4 Mg is oxidised to 2+ in MgO when it is heated
with TiCl4 to about 1200C in an inert atmos-
phere
14. Redox equation of Group 2 elements X(s) + 2H2O(l) -> X2+(aq) +2OH-(aq) + H2(g)
with water
15. Sparingly soluble Group 2 hydroxide Mg(OH)2
16. Insoluble Group 2 sulphate BaSO4
17. The use of acidified BaCl2 solution Test for sulfate ions
If Barium Chloride is added to a solution that
contains sulphate ions a white precipitate forms
(BaSO4)
18. The use of Mg(OH)2 in medicine (in solution as milk of magnesia) to neutralise
excess acid in the stomach and to treat consti-
pation
19. The use of BaSO4 in medicine In a 'Barium meal' given to patients who need
x-rays of their intestines. The Barium absorbs
the x-rays and so the gut shows up on the x-ray
image. Even though Barium compounds are
toxic it is safe to use here because of its low
solubility
Study online at https://quizlet.com/_4vr459
1. Periodic table Table that provides chemists with a structural
organisation of the known chemical elements
that can be used to deduce physical and chem-
ical properties
2. Atomic radius across Period 3 Decreases
3. First ionisation energy across Period 3 Increases
Exceptions: Drops at Al and S
4. Melting points across Period 3 Increases from Na to Si
Decreases from Si to Ar
Small rise at S
5. Explain why the melting point of alu- Bigger charge (3+ compared to 1+)
minium is higher than the melting point More free/delocalised electrons
of sodium Stronger metallic bonding/stronger (electro-
static) attraction between the ions electrons
6. Explain why the melting point of sulfur S bigger molecule
is higher than the melting point of phos- So more/stronger van der Waals' forces (to be
phorus broken or overcome)
7. Atomic radius down Group 2 Increases
8. First ionisation energy down Group 2 Decreases
9. Melting point down Group 2 Decreases
Exception Ca which increases
10. Explain the melting point of the ele- Be and Mg have hexagonal close packed struc-
ments in terms of the structure and tures
bonding of Group 2 elements Ca, Sr and Ba have cubic structures
, AQA A Level Chemistry- Inorganic chemistry
Study online at https://quizlet.com/_4vr459
11. The relative solubilities of the hydrox- Increase down the group
ides, X(OH)2, of the elements Mg-Ba in
water
12. The relative solubilities of the sulfates, Decrease down the group
XSO4, of the elements Mg-Ba in water
13. The role of magnesium in the extraction Mg is used as a reducing agent
of titanium from TiCl4 Mg is oxidised to 2+ in MgO when it is heated
with TiCl4 to about 1200C in an inert atmos-
phere
14. Redox equation of Group 2 elements X(s) + 2H2O(l) -> X2+(aq) +2OH-(aq) + H2(g)
with water
15. Sparingly soluble Group 2 hydroxide Mg(OH)2
16. Insoluble Group 2 sulphate BaSO4
17. The use of acidified BaCl2 solution Test for sulfate ions
If Barium Chloride is added to a solution that
contains sulphate ions a white precipitate forms
(BaSO4)
18. The use of Mg(OH)2 in medicine (in solution as milk of magnesia) to neutralise
excess acid in the stomach and to treat consti-
pation
19. The use of BaSO4 in medicine In a 'Barium meal' given to patients who need
x-rays of their intestines. The Barium absorbs
the x-rays and so the gut shows up on the x-ray
image. Even though Barium compounds are
toxic it is safe to use here because of its low
solubility
