Edexcel A level Chemistry Topic 4 Inorganic
Chemistry questions 2024
Trend in the ionisation energy of Group 2 - 1st and 2nd ionisation energies of
Group 2 decreases down the group.
- extra electron shell
- inner electrons shield the outer electrons from the attraction of the nucleus.
- the outer electrons are also further away from the nucleus as the atomic radius
increases
- this reduces the electrostatic attraction between the the nucleus and outer
electron, means its easier to remove the outer electron, so ionisation energy
decreases.
Why is the 3rd ionisation energy greater than the 1st and 2nd ionisation energies?
- - because the rremoval of a third electron tro form a 3+ ion, requires a lot more
energy
- electron has to be removed against the attraction of a much larger effective
nuclear charge
Does the decrease in ionisation energy down the group make Group 2 elements
more or less reactive? - - more reactive
, Edexcel A level Chemistry Topic 4 Inorganic
Chemistry questions 2024
Why does the melting points of Group 2 decrease down the group? - - shielding
increases
- electrostatic attraction between delocalised electrons and nuclei of atoms is
weaker
- so melting point decreases
Properties of Group 2 elements? - - high m.p. and b.p.
- white compounds
- low density, light metals
Are Group 2 oxidising or reducing agents? - - reducing agents
When Group 2 elements react with oxygen, what do they form?
- what needs to happen first? - - white, ionic solids.
- needs to be heated first, once heated, reacts vigorously.
When Group 2 elements react with water, what do they form?
- which element is an exception
- do they react with increasing/decreasing vigour down the group
Chemistry questions 2024
Trend in the ionisation energy of Group 2 - 1st and 2nd ionisation energies of
Group 2 decreases down the group.
- extra electron shell
- inner electrons shield the outer electrons from the attraction of the nucleus.
- the outer electrons are also further away from the nucleus as the atomic radius
increases
- this reduces the electrostatic attraction between the the nucleus and outer
electron, means its easier to remove the outer electron, so ionisation energy
decreases.
Why is the 3rd ionisation energy greater than the 1st and 2nd ionisation energies?
- - because the rremoval of a third electron tro form a 3+ ion, requires a lot more
energy
- electron has to be removed against the attraction of a much larger effective
nuclear charge
Does the decrease in ionisation energy down the group make Group 2 elements
more or less reactive? - - more reactive
, Edexcel A level Chemistry Topic 4 Inorganic
Chemistry questions 2024
Why does the melting points of Group 2 decrease down the group? - - shielding
increases
- electrostatic attraction between delocalised electrons and nuclei of atoms is
weaker
- so melting point decreases
Properties of Group 2 elements? - - high m.p. and b.p.
- white compounds
- low density, light metals
Are Group 2 oxidising or reducing agents? - - reducing agents
When Group 2 elements react with oxygen, what do they form?
- what needs to happen first? - - white, ionic solids.
- needs to be heated first, once heated, reacts vigorously.
When Group 2 elements react with water, what do they form?
- which element is an exception
- do they react with increasing/decreasing vigour down the group
