AQA A-Level Chemistry - Group 2

AQA A-Level Chemistry - Group 2
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1. Explain the trend in atomic radius down group 2 Increases down group.

2. Explain the trend in 1st ionisation energy down group -Decreases down group.
2 -More shielding, weaker at-
traction as nucleus and out-
er e- further apart.
- Easier to remove outer e-
(less energy).

3. Explain the trend in melting points down group 2 -Generally decrease down
group (not Mg).
-Larger ions, distance be-
tween + metal nuclei and
delocalised e- is greater.
-Less energy to break
bonds.

4. Explain the trend in solubilities down group 2 -Hydroxides, increase down
group,
-Sulfates, decrease down
group.

5. Describe how you would test for the presence of sul- 1. Add HCl (removed car-
fate ions bonates whcih may give a
false +).
2. Add BaCl2, observe white
ppt;
Ba^2+(aq) + SO4^2-(aq) ->
BaSO4(s)

6. What is the use of in medicine BaSO4? -Barium Meal (X-ray)
-ID's issues with digestion

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