Group II Alkaline Earth Metals - Chemistry, OCR A - As Level

Notes, exam technique and lots of equations - Group II Alkaline Earth Metals

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Group II Alkaline Earth Metals
When questions ask about the reactivity of a group 2 alkaline earth metal
1. Number of electron shells (atomic size)
2. Distance of outer shell electrons from the nucleus
3. The nuclear charge i.e. how positive that nucleus is
4. Shielding from positive charge of nucleus
Reactivity of the metals increases as the group is descended because the number of electron
shells increases (atomic size) and this increases the shielding of the outer shell electrons from
the positive charge of the nucleus, outweighing the nuclear charge. Therefore the outer shell
electrons need less energy to be removed and are lost more easily, making the metal more
reactive.
General Equations
Reaction with oxygen
2M + O2 2MO
Reaction with water
M + H2O M(OH) 2 + H2
Magnesium Equations
Magnesium reacting with steam
Mg + H2O MgO + H2
Magnesium reacting with water
Mg + H2O M(OH) 2 + H2
Magnesium reacting with hydrochloric acid
Mg + HCl MgCl2 + H2
Half equations for the reaction between magnesium and hydrochloric acid
Oxidation: Mg Mg2+ + 2e-

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Reduction: 2H+ + 2e- H2…read more

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