IMENTI SOUTH 233 /1 CHEMISTRY PAPER 1

IMENTI SOUTH
233 /1
CHEMISTRY PAPER 1
1. Element W, X, Y and Z have their atomic numbers given as 2, 14, 18 and 20 respectively. Select
a) Two elements in the same chemical family.
(1 mark)
b) An element which is in the fourth period on the periodic table.
(1 mark)
c) The element that has highest tendency to form covalent compounds.
(1 mark)
2. Explain why the blue colour of aqueous copper (II) sulphate fades when a piece of magnesium ribbon is
dropped into the solution.
(2 marks)
o
o
3. The table below shows solubility of potassium bromide and potassium sulphate at 0 C and 40 C.