Studied by 3 people
why do all group 2 elements have similar chemical properties
they have an s2 outer shell configuration
what happens to atomic radii going down the group
extra shells are added and greater shielding from the inner shells which outweighs the greater nuclear charge
what happens ionisation energies going down the group
they decrease because atomic radius increases so there’s less attraction between the outer shell electrons and nucleus
what happens to the reactivity going down the group
it increases because the activation energies decreases so less energy is required to make the atoms ions
group 2 metal + oxygen
group 2 oxide
group 2 metal + water
group 2 hydroxide solution + hydrogen
group 2 metal + acid
group 2 salt + hydrogen
when are alkaline solutions formed
when reacted with water and formed a metal hydroxide, which is slightly soluble if there’s excess water
what happens to solubility of group 2 hydroxide as you go down the group
it increases so the solutions become more alkaline
group 2 oxide + acid
group 2 salt + water
group 2 carbonates + acid
group 2 salt + carbon dioxide + water
are group 2 carbonates soluble
no they’re insoluble in water
what can be used to neutralise acids
group 2 oxides, hydroxides, and carbonates
what are calcium carbonate and magnesium hydroxide used in
indigestion tablets to neutralise excess acids in the stomach
why are calcium carbonate and magnesium hydroxide good for indigestion tablets
they’re virtually insoluble so won’t make liquid in mouth or stomach becoming dangerously alkaline
what is calcium hydroxide used for
to neutralise acidic soils in agriculture
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