A-LEVEL CHEMISTRY: 3.2.2: Group 2 (ChemRevise)

Question 1

as you go down group 2, atomic radius ___. why?

Answer 1

increases

because number of shells increases

Question 2

explain the trend in melting point down group 2: (5)

Answer 2

decrease

-number of shells increases. atomic radius increases. shielding increases

-nuclear charge increases

-electrostatic forces of attraction between +ve metal ions & -ve delocalised electrons decreases

-weaker metallic bonds, require less energy to break. MP decreases

Question 3

explain the trend in reactivity down group 2: (5)

Answer 3

increases

-group 2 atoms react by losing electrons

-number of shells increases, atomic radius increases, shielding increases

-nuclear charge increases

-weaker electrostatic forces of attraction between nucleus & outer electrons ∴ easier to lose.

Question 4

the group 2 metals will burn in ___. they burn with…

Answer 4

oxygen
bright coloured flames

Question 5

equation for reaction between Mg and O.
what is observed?

Answer 5

2Mg + O2 —–> 2MgO

bright white light

Question 6

explain reaction between group 2 metals & cold water: (4)

Answer 6

-fizzing (increases down the group)

-metal dissolving (faster down the group)

-solution heats up (increases down the group)

-precipitate forming (decreases down the group)

Question 7

titanium is extracted by reaction with a ___ ___ metal. eg:

Answer 7

more reactive
eg: Magnesium

Question 8

why can’t you extract titanium with carbon?

Answer 8

because instead of displacing it, titanium carbide (TiC) is formed

Question 9

what can be used to remove SO2 from waste gases?

Answer 9

calcium oxide

Question 10

as you go down group 2, the solubility of group 2 hydroxides ___

Answer 10

increases

Question 11

all group 2 hydroxides, when not soluble, appear as…

Answer 11

white precipitates

Question 12

as you go down group 2, the solubility of group 2 sulfates ___

Answer 12

decreases