1989
(a) A mixture consist of sodium chloride, ammonium chloride and lead (II) tetraoxosulphate (VI). Describe how you would obtain each component in a pure state.(b) You are required to determine the concentration of a solut…
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1989 WAEC SSCE Chemistry Past Questions
1989
Credit will be given for strict adherence to instructions, for observations precisely recorded, and for accurate inferences. All tests, observations, and inferences must be clearly entered in your answer book, in ink, at…
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1989
D is 2.00M ethanoic acid. E is 2.00M potassium hydroxide solution.(a) Using a 50cm\(^3\) measuring cylinder, measure 50cm\(^3\) of D and transfer the solution into plastic cup.Record the temperature T\(_1\) of the soluti…
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1989
(a) Explain the differences in the reactions of zinc with dilute trioxonitrate (V) acid and zinc with dilute hydrochloric acid.(b) Write equations to illustrate how ammonia gas can be converted into trioxonitrate (V) aci…
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1989
(a) Distinguish between a conductor and an electrolyte(b)(i) State Faraday's first law of electrolysis(ii) Describe how you would investigate Faraday's law of electrolysis, using copper (II) tetraoxosulphate (VI) solutio…
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1989
(a) List three characteristics of a homologous series(b) Give one example of;(i) alkanes; (ii) alkynes.(c) A hydrocarbon contains 7.7% by mass of hydrogen and 92.3% by mass of carbon. The relative molar mass of the compo…
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1989
(a) State Le Chatelier's principle(b) Use Le Chetelier's principle to deduce the conditions that favour a high yield of ammonia in the Haber process(c) Give the chemical test for ammonia.(d) State what would be observed…
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1989
(a) Name the components of(i) producer gas; (ii) water gas;(b) Give the reason why water is a better fuel than producer gas.
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1989
Consider the compounds represented as A and B below:(a) What is the celationship between A and B? (b) Name A and B.(c) Will the chemical properties of A and B be the same? Give one reason for your answer.
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1989
(a) The half-life of 56/25 Mn is 9.3 x 10\(^3\)S. What does the statement mean?(b) Give the three types of radiation that are usually emitted by radioactive substances.
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1989
(a) Name the gas evolved when dilute hydrochloric acid is added to each of the following solids and the mixture is warmed(i) sodium trioxocarbonate (IV);(ii) potassium trioxosulphate (IV);(iii) iron (II) sulphide.(b) Nam…
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1989
Name the type of chemical process involved in the production of(a) polythene from ethene(b) ethene from kerosene fraction of petroleum.(c) soap from vegetable oils(d) margarine from vegetable oils
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1989
(a) Write the formula of the oxide of nitrogen in which nitrogen has oxidation number of (i) +1;(ii) +2;(iii) +3;(iv) +4;(b) State which of the oxides in (a) above is/are: (i) acidic (ii) neutral.
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1989
(a) Give two characteristic features of boiling(b) What will be the effect of the following on the boiling point of water:(i) addition of crystals of sodium chloride,(ii) reduction of the atmospheric pressure?(c) State t…
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1989
(a) Give one physical property of(i) diamond;(ii) graphite(b) Give two uses of diamond(c) evidence that shows that both graphite and diamond are allotropes of carbon.
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1989
(a) When is a sample of water said to be hard?(b) State one difference between temporary and permanent hardness of water(c) Give one method of removing hardness completely from water(d) Name two local is used for the pro…
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1989
(a) Write the chemical equation for the formation of named alkanoate.(b)(i) What are the monomers of protein called?(ii) Write the two functional groups present in the monomers named in (b)(i) above(iii) State the type o…
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1989
Which of the following statements best explains cracking ? It is a process
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1989
Which of the following reactions represents the laboratory preparation of hydrogen?
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1989
The major raw material in a plastic industry is
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