2018
All your burette readings (initials and final) as well as the size of your pipette must he recorded but no account of experimental procedure is required. All calculations must be done in your booklet.State the observatio…
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2018 WAEC SSCE Chemistry Past Questions
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2018
All your burette readings (initials and final) as well as the size of your pipette must be recorded but no account of experimental procedure is required. All calculations must be done in your booklet.C and D are inorgani…
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2018
All your burette readings (initials and final) as well as the size of your pipette must be recorded but no account of experimental procedure is required. All calculations must be done in your booklet.A solution of potass…
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2018
(a) (i) List two gaseous pollutants that can be generated by burning coal. (ii) Explain briefly why coal burns more easily when it is broken into pieces than when it is in lumps. (iii What gas is responsible for most…
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2018
(a) Outline the procedures for the treatment of water for town supply. (b) (i) State two main impurities present in bauxite. (ii) Give one reason why bauxite is usually preferred as the ore for the extraction of aluminiu…
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2018
a) (i) Describe, using the kinetic theory of matter, what happens when potassium chloride dissolves in water. (ii) Give a reason why the process in (a) (i) is endothermic. (b) (i) An underground iron pipe is less likely…
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2018
(a) A compound of carbon, hydrogen and chlorine contains 0.48 g of carbon, 0.08 g of hydrogen and 1.42 g of chlorine. (i) Determine the empirical formula of the compound. (ii) If the molar mass of the compound is 99, cal…
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2018
(a) Arrange the three states of matter in order of decreasing: (i) kinetic energy; (ii) force of cohesion. (b) Consider the redox reaction equation: (i) State the change in oxidation number of: I. magnesium; II. hydrogen…
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2018
(a) (i) State the collision theory of reaction rates.(ii) Using the collision theory, explain briefly how temperature can affect the rate of a chemical reaction. (b) (i) Sketch a graphical representation of Charles law.…
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2018
(a) (i) Name the ore mostly used in the extraction of aluminium. (ii) Name two major impurities in the ore named in (a)(i). (iii) Name the material used in making the electrodes in the extraction of aluminium. (iv) Gi…
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2018
(a)(i) Describe briefly the laboratory preparation of hydrogen gas from the action of steam on iron. (ii) Write the equation for the reaction in (a)(i). (iii) List three methods for the industrial preparation of hydrogen…
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2018
(a) Explain the statement, the standard electrode potential of zinc is -0.76 v.What is meant by the term periodic property of elements?(b) Consider the following standard electrode potentials: Zn\(^{2+}\)\(_{(aq)}\) + 2e…
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2018
1. (a ) Define the term compound. (b) State two conditions necessary for the cracking of petroleum fractions. (c) Name two transition elements that are used as catalyst. (d) (i) Write an equation for the reaction between…
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2018
(a) (i) List the two gaseous fuels produced from coke. (ii) Which of the two fuels listed in 5(a)(i) is a better fuel? (iii) Give reasons for your answer in 5(a)(ii) (iv) Write a balanced equation for the production of e…
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2018
(a) (i) Define the term fermentation(ii) Name the catalyst that can be used for this process(b) Name two factors which determine the choice of an indicator for an acid-base titration(c) Consider the following reaction eq…
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2018
(a)(i) State two industrial uses of hdrogen.(ii) Consider the equation below. Mg(HCO\(_3\))\(_{2(aq)}\) \(\to\) MgCO\(_{3(g)}\) + H\(_2\)0\(_{(l)}\) + CO\(_{2(g)}\)1. State the type of hardness of water being removed as…
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2018
(a)(i) Draw and label a diagram for the laboratory preparation of a dry sample of sulphur(IV)oxide.(ii) Write a balanced chemical equation for the reaction in (a)(i).(iii) State the precaution that must be taken in the p…
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2018
(a)(i) Draw the structure of the sixth member of the alkenes.(ii) Calculate the relative molecular mass of the sixth member of the alkene.(iii) State one difference between cracking and reforming in the petroleum industr…
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2018
(a)(i) Sketch a graphical representation of Charles' law.(ii) Calculate the volume of oxygen that would be required for the complete combustion of 2.5 moles of ethanol at s.t.p. [molar volume at s.t.p. = 22.4 dm\(^3\)](b…
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2018
Particles in a solid exhibit
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