Group 2

Question 1

Mg (s) + H2O (l) →

Answer 1

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

Bubbles

Question 2

Mg (s) + H2O (g) →

Answer 2

Mg (s) + H2O (g) → MgO (s) + H2 (g)

White fumes, white solid

Question 3

Ca (s) + H2O (l) →

Answer 3

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

Fizzes, white solid (slightly soluble), alkaline solution

Question 4

Sr (s) + H2O (l) →

Answer 4

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

Fizzes, less white solid (more soluble than Ca(OH)2)

Question 5

Ba (s) + H2O (l) →

Answer 5

Ba (s) + 2 H2O (l) → Ba(OH)2 + H2 (g)

Fizzes, colourless solution

Question 6

Extraction of Ti from TiCl4 using Mg

Answer 6

TiO2 + 2Cl2 + 2C → TiCl4 + 2CO

TiCl4 + 2Mg → Ti (s) + 2MgCl2

Question 7

Removal of SO2 from flue gas (desulfurisation)

Answer 7

CaO + SO2 → CaSO3

CaCO3 + SO2 → CaSO3 + CO2