2022-05-18 12:08:58
POSSIBLE CHEMISTRY QUESTIONS FOR 2022 WASSCE
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*MR LUKE *
0506816801
(1a) Name one product of destructive distillation of coal that is
(i) Solid;
(ii) Liquid;
(iii) Gas.
(b) (i) What is the major component of synthetic gas?
(ii) Give one reason why synthetic gas is not a major source of air pollution.
(c) (i) Write a balanced chemical equation for the complete combustion of carbon.
(ii)State two:
I. physical;
II. chemical properties of the product in 1 (c )(i)
(d) (i) Name two allotropes of carbon that are
1. crystalline;
II. amorphous.
(ii) State one use of each of the allotropes named in 1(d)(i).
(e) (i) By means of balanced chemical equations only, outline the process of manufacture of H2S04 by contact process.
(ii) State the function of H2S04 in each of the following reaction equations:
1. C2H5OH(l) cone H2S04 →C2H4(g);
II. Pb(NO3)2(aq) + H2S04(aq) → PbS04(s) + 2HN03(aq)
2.a) (i) Explain why water is referred to as a universal solvent.
(ii) Give one chemical test for water.
(b) A current of 1.25A was passed through an electrolytic cell containing dil. H2S04 for 40 minutes
(i) Write a balanced equation for the:
I. oxidation half reaction;
II. reduction half reaction;
III. overall reaction.
(ii) Calculate the volume of gas produced at the anode at s.t.p.
[IF = 96500 C, Molar Volume of gas at s.t.p = 22.4 dm3 mol-1]
(c) Consider the reaction represented by the following equation:
Au(s) + Cl2(g) → AUCl3(s)
(i) Balance the equation
(ii) If 1.250g of Au and 1.7 44g of Ch were mixed,
I. determine which of the reactants is in excess;
II. calculate the excess amount,
[Au = 197.0, Cl = 35.5 ]
*MR LUKE *
0506816801
3.a) (i) Give the two reasons why soda lime is used instead of caustic soda in the preparation
of methane.
(ii) List two physical properties of methane.
(Hi) A hydrocarbon with a vapour of29 contains 82.76% carbon and 17.24% hydrogen.
Determine the:
I. empirical formula;
ii. molecular formula of the hydrocarbon.
[H = 1.00 C = 12.00]
(b) (i)What is meant by the term isomerism?
(ii) Draw the structures of the two isomers of the compound with the molecular formula C2H60.
(iii) Give the name of each of the isomers in4(b)(ii).
(iv) State the major difference between the isomers.
(c) Give three deductions that could be made from the qualitative and quantitative analysis of a given organic compound.
(d) Give one chemical test to distinguish between propene and propane.
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