Topic 4 - The Periodic Table

Question 1

Group 2 with Oxygen (Calcium)

Answer 1

2Ca + O2 = 2CaO

Question 2

Gropup 2 with Chlorine (Calcium)

Answer 2

Cl2 + Ca = CaCl2

Question 3

Group 2 with cold water

Answer 3

Mg + 2H2O = Mg(OH)2 + H2

Question 4

Group 2 with hot water

Answer 4

Mg + H20 = MgO + H2

Question 5

Oxide with water

Answer 5

MgO + H2O = Mg(OH)2

Question 6

Oxide plus Acid

Answer 6

MgO + H2SO4 = MgSO4 + H2O

Question 7

Solubility of group 2 hydroxides and sulfates down the group

Answer 7

The solubility of hydroxides increases.

Solubility of sulfates decreases.

Question 8

Thermal decomposition of lithium nitrates

Answer 8

The small radius of lithium ion causes it to have a high charge density, which polarises the O-N bonds in the nitrate ion sufficiently to break them and form 02- ions.

Question 9

Thermal decomposition of nitrates

Answer 9

Group 1 nitrates decompose on stong heating.
Group 2 nitrates is suffciently polarised by the 2+ cation to a result that it follows the same pathway as Lithium notrates.