Zusammenfassung der Ressource
Group 2
- Physical
Properties
- Melting points
decrease down
the group
- Atoms increase in size, outer
electrons further away from
nucleus and increased
shielding= attractive force of
nucleus on outer electrons
decreases
- Reactivity increases
down the group
- Ionisation
energy decreases
down the group
- Chemial
Properties
- Reaction with
water= M +
2H20 >>>>
M(OH)2 + H2
Anmerkungen:
- Where M is any metal
Follows trend of reactivity
- Solubilities of
the hydroxides
become more
soluble down
the group
- Use of magnesium
hydroxide= milk of
magnesia- used in
indigestion tablets to
neutralise stomach acid
Anmerkungen:
- Use of calcium
hydroxide- treat
acidic soil in
agriculture
Anmerkungen:
- Solubilities of the
sulphates, opposite-
less soluble down
the group
- sulphate ions test= e.g barium
sulphate acidified and then barium
chloride- if there is sulphate
present it forms barium sulphate-
the addition of the acid removes
carbonate ions
- Ba+ + SO42-
>>>>> BaSo4
- Use of
barium
sulphate
(BaS04)
Anmerkungen:
- barium meal to outline the gut in x rays bc it is insoluble