Group Two -

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Group 2 react with H20 to produce hyrdooxides.

When group two elements react they form ions with a charge of 2+, which is because they contain 2 electrons in their outer shell.

E.g : M -> M2+ + 2e-

       Ca -> Ca2+ + 2e-

The group 2 metals react with water to give a metal hydroxide and hydrogen

E.g : M (s) + 2H20 (l) --> M(OH)2 (aq) + H2 (g)

      : Ca(s) +2H2O (l) --> Ca(OH)2 (aq) + H2 (g)

Group 2 become increasingly reactive down the group because the outermost electrons are further away from the nucleous and so are more easily lost.

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Group 2 Oxides and Hydroxides are Bases

Form Alkaline Solutions in H20

1. Oxides of group 2 metals react readily with water to form metal hydroxides, which dissolve. Hydroxide ions OH- make the solutions strongly alkaline.

E.g: CaO (s) + H2O --> Ca2 (aq) + 2OH- (aq)

2. MgO is an exception - it reacts really slowly, and the hyrdoxide isnt very soluble.

3. Oxides form more strongly alkaline solutions as you go down the group, which is because the oxides become more soluble.

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Neutralise Acids

Because they are bases, both the oxides and hydroxides neutralise dilute salts  forming solutions of the corresponding salts.

MgO(s) + 2HCl --> H2O (l) + MgCl2 (aq)

Mg(OH)2 (s) + 2HCl --> 2H2O + MgCl2 (aq)

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