Group 2 inorganic

Question 1

explain the changes in atomic radius going down the group

Answer 1

increases as another shell of electrons is added

Question 2

explain the changes in IE going down the group

Answer 2

decrease going down, takes less energy to remove outer electron as they are further away from the nuclear and therefore a weaker electrostatic charge

Question 3

explain the changes in melting points going down the group

Answer 3

decrease, sea of electrons in bonding gets further away from nucleus so electrostatic force decreases so strength of metallic bond is weaker, less energy required to break

Question 4

is there an anomaly to the melting point trend

Answer 4

magnesium, lowest m.p.t

Question 5

explain the reactivity trend of the group in water

Answer 5

increases going down, the further away an electron is from the nucleus, the weaker its electrostatic attraction and the more likely it is to react with another atom as it takes less energy to break

Question 6

state the solubility of group 2 hydroxides

Answer 6

become more soluble going down,

Question 7

state the formulas of magnesium hydroxide

Answer 7

Mg(OH)2

Question 8

state the solubility of group 2 sulphates

Answer 8

less soluble going down group

Question 9

how is the insolubility of barium used In test for sulphate ions?

Answer 9

solution acidified HCl, barium chloride added, if sulphate present then white precipitate formed of barium sulphate (insoluble)