Group 2

Question 1

Atomic radius trend

Answer 1

Increases down the group because there are more shells

Question 2

Reactivity trend

Answer 2

Increases down the group because shielding increasing so outer electron is easier to lose

Question 3

First ionisation energy trend

Answer 3

Decreases down the group because increased atomic radius and increased shielding

Question 4

Melting point trend

Answer 4

Decreases down the group because the metal ions get larger down the group so weaker attractive forces because has to act over a larger distance

Question 5

Reactions with water (products)

Answer 5

Metal hydroxide + hydrogen

Question 6

Mg+2H2O(l) —> ???

Answer 6

Mg(OH)2+H2

Question 7

Observations when reacting Mg with steam

Answer 7

Burns bright white and forms white powder

Question 8

Mg+H2O(g) —> ???

Answer 8

MgO+H2

Question 9

Solubility of hydroxides trend

Answer 9

Increases down the group (Mg(OH)2 is least soluble)

Question 10

Uses of Mg(OH)2

Answer 10

Medicine - Antacid (neutralises acids)
Agricultural - Neutralises acidic soil

Question 11

Solubility of sulfates trend

Answer 11

Decreases down the group (BaSO4 least soluble)

Question 12

Use of BaSO4

Answer 12

Medical - Barium meals (used as tracer for imaging) - toxic if in bloodstream but is insoluble so can’t be absorbed into blood

Question 13

Sulfate ion test

Answer 13

BaCl2 used - forms white ppt. (BaSO4)

Question 14

Metal extraction

Answer 14

Mg used to extract titanium from TiCl4 (TiCl4+2Mg —> 2MgCl2+Ti)

Question 15

Flue gas removal (equation)

Answer 15

CaO+2H2O+SO2 —> CaSO3+2H2O