K.C.S.E Chemistry Q & A - MODEL 2005.PP2.QN.2

7/10/2020

KCSE Chemistry 2005 Topical Questions and Answers

All Questions Featuring Chemistry Form 1, Form 2, Form 3, Form 4, Paper 1, Paper 2 and Paper 3

(a) Name one raw material which sodium hydroxide is manufactured
(b) Sodium hydroxide pellets were accidentally mixed with sodium chloride 17.6 g of the mixture were dissolved in water to make one litre of solution. 100 cm3 of the mixture were dissolved in water to make one litre solution. 100cm3 of the solution was neutralized by 40cm3 of 0.M sulphuric acid
(i) Write an equation for the reaction that took place
(ii) Calculate the:
(i) Number of moles of the substance that reacted with sulphuric acid
(ii) Number of moles of the substances that would react with sulphuric acid in the one litre of solution
(iii) Mass of the unreacted substances in one litre of solution
(H = 1,0 ; Na = 23.0 ; Cl= 35.5 ; 0= 16.0)
(c) The diagram below shows an incomplete set-up used to prepare and collect ammonia gas

(i) Name solid M
(ii) Complete the diagram to show how a dry sample of ammonia gas can be collected
(d) In an experiment, excess ammonia gas passed over heated copper (II) oxide on a combustion tube.
(i) State the observation that was made in the combustion tube at the end of the experiment
(ii) What property of ammonia is shown in the above reaction
(iii) Name one use of ammonia

ANSWERS