Group 2

Question 1

Atomic radius

Answer 1

Increases. Trend in atomic radius down the group. This trend is dUe to more orbitals and a weaker nuclear charge as the charge is offset by the shielding that has come about from more orbitals

Question 2

Trend in first ionisation energy

Answer 2

Decreases. Trend in first ionisation energies down the group. This is because the electrons get further from the nucleus so has a weaker pull from the nucleus

Question 3

Trend in reactivity

Answer 3

Increases. Trend in reactivity down the group. This is due to the electrons being further from the nucleus allowing the interaction with other molecules

Question 4

Melting point

Answer 4

Decreases. Trend in melting point down the group. This is because the delocalised electrons are further from the nucleus as the atomic radius increases

Question 5

When an element from group 2 reacts with liquid water:

Answer 5

X + 2H20 -> X(OH)2 + H2

Question 6

Reactivity with water trend

Answer 6

Increases. This is because the ionisation energy decreases so there are more molecules with enough energy for a successful reaction due to increased successful collisions

Question 7

Trend in solubility of hydroxides

Answer 7

Increases going down the group.

Question 8

When a chlorate in group
2 reacts with sodium hydroxide:

Answer 8

XCI2 + 2NaOH -> 2NaCl + X(OH)2

Question 9

Trend in solubility of sulphates going down the group

Answer 9

Decreases

Question 10

Uses of Mg(OH)2

Answer 10

Treats indigestion

Question 11

Use of Ca(OH)2

Answer 11

Neutralise Soil

Question 12

Pure Ti Extraction
Equation

Answer 12

TiCI4 + 2Mg -> Ti + 2MgCI2

Question 13

How to test for sulphate ions

Answer 13

BaCI2, look for a white precipitate

Question 14

What colour precipitate is formed with the following reaction?

Answer 14

BaCI2 + Na2SO4 -> 2NaCI
+ BaSOL
White

Question 15

What do you add to the solution before adding BaCI2 to ensure that no
CO2 is formed?

Answer 15

HCl

Question 16

Uses of BaSO4, this is due to its insolubility, despite its toxicity

Answer 16

X-Rays/Barium meals

Question 17

Equation for Wet
Scrubbing with CaO

Answer 17

CaO (s) + 2H20(1) + SO2(g) ->
CaSO3(s) + 2H20(1)

Question 18

Equation for Wet
Scrubbing with CaCO3

Answer 18

CaCO3(s) + 2H20(1) + SO2(g) ->
CasO3(s) + 2H20(1) + CO2(g)

Question 19

What’s the use for CaO and CaCO3

Answer 19

Remove acidic gases from chimney flus in wet scrubbing to prevent acid rain

Question 20

Reaction of magnesium
with steam

Answer 20

Mg(s) + H20(g) -> MgO (s) + H2(g)

Question 21

What’s the use of
Ca(OH)2?

Answer 21

Neutralises acidic soil