Group 2 [3]

Question 1

Group 2 metal with water in excess (liquid)

Answer 1

M(s) + H₂O(l) ➞ M(OH)₂(s) + H₂(g)

Question 2

Group 2 metal with water in limit (gas)

Answer 2

M(s) + H₂O(g) ➞ MO(s) + H₂(g)

Question 3

What is Ca(OH)₂ used for?

Answer 3

Neutralising acidic soil in agriculture

Question 4

What is Mg(OH)₂ / CaCO₃ used for?

Answer 4

Neutralising stomach acid in medicine

Question 5

Are group 2 nitrates soluble?

Answer 5

Yes, all of them

Question 6

Are group 2 chlorides soluble?

Answer 6

Yes all of them

Question 7

Are group 2 hydroxides soluble?

Answer 7

Not all of them. Solubility INCREASES down the group.

Question 8

Are group 2 sulphates soluble?

Answer 8

Not all of them. Solubility DECREASES down the group.

Question 9

Are group 2 carbonates soluble?

Answer 9

No, none of them are soluble.

Question 10

What is the trend in reactivity of group 2 elements?

Answer 10

Reactivity increases down the group in proportion to the decrease in first IE and second IE. Further down the group, the more readily the element loses its valence electrons.

Question 11

Group 2 Oxide (MO) + Water?

Answer 11

A vigorous reaction occurs as the group 2 oxide is converted to a group 2 hydroxide…

MO(s) + H₂O(g) ➞ M(OH)₂(aq)

These group 2 hydroxides are more soluble down the group, so alkalinity following addition of water INCREASES down the group as well