Topic 9: Group 2

Question 1

Reaction with water (M being Gp2 element)

Answer 1

M + 2H2O(l) —> M(OH)2 +H2

Question 2

Mg reacting with steam rather than water, slower/ faster

Answer 2

Mg + H20(g) —> MgO + H2 (quicker reaction)

Question 3

Reactivity down group 2

Answer 3

Reactivity increases down group, becomes easier to oxidise, easier to remove valence electron (reasons as IE)

Question 4

Be reaction with water

Answer 4

No reaction

Question 5

Solubility in hydroxides

Answer 5

Increases down group

Question 6

Solubility in sulfates

Answer 6

Decreases down group

Question 7

Magnesium Hydroxide

Answer 7

Indigestion medication Mg(OH)2

Question 8

Barium Sulfate

Answer 8

Barium Sulfate -used in xrays -fine as insoluble

Question 9

Calcium hydroxide

Answer 9

Slaked lime - neutralising acidic soils

Question 10

SO4-2 test

Answer 10

Acidify with dilute HCl (So BaCO3 doesn’t form (also white ppt)) BaCl2 + H2SO4 —> BaSO4 + 2HCl
+ve result white ppt of BaSO4 - insoluble

Question 11

Testing for Group 2 ions, solubility