3. Group 2

Question 1

Reactivity of group 2 metals

Answer 1

increases down the group

Question 2

Reaction of Mg with water

Answer 2

Mg (s) + 2H2O (l) → Mg(OH)2 (aq) + H2 (g)

Question 3

Reaction of Mg with steam

Answer 3

Mg (s) + H2O (g) → MgO (s) + H2 (g)

Question 4

What is observed during the reaction of Mg with steam?

Answer 4

• white solid, MgO, produced
• Bright light

Question 5

Equation for use of Mg in the extraction of ti from TiCl4

Answer 5

TiCl4 + 2Mg → 2MgCl2 + Ti

Question 6

Role of Mg in the extraction of Ti from TiCl4

Answer 6

• reducing agent
• Mg oxidised from 0 to +2

Question 7

Solubility of group 2 hydroxides (increases/ decreases) down the group

Answer 7

increases

Question 8

Mg(OH)2 & Ca(OH)2 are ____ soluble

Answer 8

sparingly

Question 9

Simplest ionic equation for production of Mg(OH)2

Answer 9

Mg 2+ (aq) + 2OH - (aq) → Mg(OH)2 (s)

Question 10

Observation for production of Mg(OH)2

in it’s simplest ionic equation

Answer 10

white precipitate, Mg(OH)2, produces

Question 11

Use of Mg(OH)2

Answer 11

indigestion relief = neutralises stomach acid

Question 12

Solubility of group 2 sulphates (increases/ decreases) down the group

Answer 12

decreases

Question 13

How soluble is BaSO4?

Answer 13

insoluble

Question 14

Simplest ionic equation for the production of BaSO4

Answer 14

Ba 2+ (aq) + SO4 2- (aq) → BaSO4 (s)

Question 15

Observation for the production of BaSO4

Answer 15

white precipitate forms

Question 16

Use of BaSO4

Answer 16

taking X-rays of the stomach (Barium meal)

Ba = toxic → can be given as BaSO4 is insoluble