Chemistry GCE Ordinary Level Paper 2 June 2019 Past Questions

SECTION B: Chemistry GCE Ordinary Level Paper 2 June 2019

Answer ANY TWO questions. All questions carry equal marks. Where appropriate, equations and diagrams should be used to illustrate your answer. Write your answers on the sheets that follow Section C.

6. Bonding in substances can cither be ionic, simple covalent, or metallic.
   (a) Define chemical bond.
   (b) Using appropriate diagrams, describe how each bond type occurs in a named substance.
  (c) Give one property of each substance, stating how this property is related to the bond type.

( 1, 15, 4 marks)


7. (a) Define the following terms.
         (i ) Solubility
         (ii) Solubility curve
( b) The table below gives the solubility of potassium nitrate (KNO3) in grams per 100g of water at different temperatures.

Temperature in °C 0 10 20 30 40 50 60
Solubility KNOiin g per 100g of H2O 16 21 31 45 62 81 106

Pot the solubility of KNO3 against temperature (X-axis)
(c) From the graph determine
     (i) The solubility of the salt at 45°C
     (ii) The temperature at which 40g of KNO3 will saturate 100g of water

(d ) (i) What mass of KNO3 would be obtained when a saturated solution is cooled from 50°C to 15 °C?
      (ii) Calculate the amount of substances of KNO3 in mol found in 100g of water in d(i ) above
(e) State one use of solubility curves

(3, 10, 2, 4, 1 marks)


Write short notes on each of the following
(a) Polymorphism
(b) Saponification
(c) Isotopy
(d) Hydrolysis

(5, 5, 5, 5 marks)



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