Group 2

Question 1

atomic radius down group 2

Answer 1

increases

Question 2

1st IE down group 2

Answer 2

decreases

larger atomic radius
more shielding

Question 3

melting point down group 2

Answer 3

decreases

weaker metallic bonding
larger ions, same delocalised electrons

Question 4

reactivity down group 2

Answer 4

increases

easier to lose outer electrons

Question 5

Group 2 reactions with oxygen

Answer 5

2Mg + O2 -> 2MgO

Question 6

solubility of group 2 hydroxides in water

Answer 6

increase down group (Ba(OH)2 is the most soluble)

Question 7

use of Mg(OH)2

Answer 7

medicine as an antacid

it is alkaline and can neutralise

this is preferred over Ca(OH)2 in medicine as it will not produce CO2 gas

Question 8

use of Ca(OH)2

Answer 8

neutralise acidic soils

Question 9

neutralisation ionic equation

Answer 9

H+(aq) + OH-(aq) -> H2O(l)

Question 10

solubility of group 2 sulfates in water

Answer 10

decrease down group (MgSO4 is the most soluble)

Question 11

use of BaSO4

Answer 11

barium meals

it is opaque to x-rays

it is insoluble, so cannot be absorbed into blood

Question 12

group 2 reactions with water; redox

Answer 12

oxidise to form 2+ ions

M -> M2+ + 2e-

Question 13

group 2 reactions with water

Answer 13

form metal hydroxide and hydrogen

M + 2H2O -> M(OH)2 + H2

Ba reacts the quickest

Question 14

group 2 reactions with water down group

Answer 14

fizzing
dissolving of metal
solution heats up

all of these are faster or more extreme down the group

Question 15

group 2 reactions with steam

Answer 15

M(s) + H2O (g) -> MO(s) + H2

Question 16

Use of Mg

Answer 16

Reducing agent to extract Ti from TiCl4

Question 17

why can’t Ti be extracted with carbon?

Answer 17

TiC is formed, not Ti

Question 18

why can’t Ti be extracted with electrolysis?

Answer 18

it has to be very pure

Question 19

Step 1 in extraction

Answer 19

TiO2(s) converted to TiCl4(l)

Tio2 + 2Cl2 + 2C -> TiCl4 + 2CO

Question 20

Step 2 in extraction

Answer 20

TiCl4 purified by distillation in Argon atmosphere

Question 21

Step 3 in extraction

Answer 21

Ti extracted by Mg in argon atmosphere at 500C

TiCl4 + 2Mg(l) -> Ti(s) + 2MgCl2

Question 22

Flue gas removal

Answer 22

SO2 can be removed from flue gas by reacting with CO or CaCO3

Make slurry; mix CO or CaCO3 with water and spray on flue gas. produces waste produce Calcium Sulfite

Question 23

Flue gas removal: CaO (calcium oxide)

Answer 23

CaO(s) + 2H2O(l) + SO2(g) -> CaSO3(s) + 2H2O(l)

Question 24

Flue gas removal: CaCO3 (calcium carbonate)

Answer 24

CaCO3(s) + 2H2O(l) + SO2(g) -> CaSO3(s) + 2H2O(l) + CO2(g)