Group 2: Oxides, Hydroxides & Carbonates

Question 1

Reactions of group 2 oxides with water
All group 2 oxides are basic, except for BeO which is

Answer 1

amphoteric (it can act both as an acid and base)

Question 2

Group 2 oxides react water to form……….

which get more …….

Answer 2

alkaline solutions which get more alkaline going down the group

Question 3

What’s is the chemical formula of group 2 oxide + water

Answer 3

NO(s) + H2O(l) ~ N(OH)(aq)

N is group 2 metal

Question 4

MgO observation when reacted with water

Answer 4

MgO is only slightly soluble in water , therefore a weakly alkaline solution will form (pH10)

Question 5

CaO observation when reacted with water

Answer 5

CaO vigorous reaction releases a lot of energy which cause some of the water to boil off as the CaO solid lump seems to expand and crack when open (ph11)

Question 6

You should know that calcium hydroxide, when in solution, is also called

Answer 6

limewater