1994
A is a solution containing 0.050 mol. dm of tetraoxosulphate (VI) acid. B is a solution of anhydrous trioxocarbonate (IV).(a) Put A into the burette and titrate with 20cm\(^3\) or 25cm\(^3\) portions of B using methyl or…
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1994 WAEC SSCE Chemistry Past Questions
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1994
C and D are samples of two different simple salts. Carry out the following exercises on them. Record your observations and identify any gases evolved. State the conclusion you draw from the result of each test.a) Heat ab…
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1994
(a) Draw a labelled sketch of the laboratory set-up for dissolving hydrogen chloride acid.(ii) Give one chemical test to distinguish between hydrochloric acid and ethanoic acid(b) Outline a suitable laboratory procedure…
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1994
(a) (i) Define heat of combustion.(ii) What name is given to the container used for determining tne reaction?(b) The heat of combustion of carbon in excess air is - 3935 kJ.(i) Sketch an energy profile diagram for the re…
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1994
(a)(i) Determine the maximum number of electrons that can occupy the principal energy level M of an atom.(ii) Show the changes in the electronic structures of atoms of sodium and fluorine (\(^{23}_{11}\)Na: \(^{19}_{9}F\…
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1994
(a)(i) What is meant by hydrocarbons?(ii) A hydrocarbon consists of 92.3% carbon. If it's vapour density is 39, determine its molecular formula. (H = 1; C = 12)(b)(i) Outline a suitable laboratory procedure for obtaining…
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1994
(a)(i) Draw a labelled diagram for the laboratory preparation of a dry sample of chlorine(ii) Give one chemical test for chlorine.(b) Write equations to represent the reaction of chlorine gas with: (i) iron (II) chloride…
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1994
Potassium trioxochlorate (V) undergoes thermal decomposition according to the fotpowing equation: 2KCIO\(_3\) \(\to\) 2KCI + 3O\(_2\)(a) What substance could be used in the laboratory to in ease the rate of the reaction(…
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1994
(a) State whether entropy increases or decreases during each of the following processes(i) condensation of steam;(ii) melting of wax;(iii) dissolution of sugar in water;(iv) abscas on charcoal.(b) What deduction can be m…
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1994
When ethane - 1,2-dioic acid is heated with concentrated tetraoxosulphate (VI) acid, a reaction represented by the following equation occurs:(a) State the type of process involved in the reaction(b) What is the basicity…
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1994
(a) Write an equation to show the action of strong heat on:(i) potassium trioxonitrate (V):(ii) sucrose.(b) State two observations in respect of the reaction between granulated zinc and dilute tetraoxosulphate (VI) acid.…
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1994
(a) When MgSO\(_4\).XH\(_2\)O crystals were exposed to the atmosphere for several days, three was a loss in mass(i) What name is given to this phenomenon?(ii) Give another example of a compound that exhibits this phenome…
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1994
(a) Define oxidation in terms of electron transfer.(b) Consider the following: Cu\(_{(s)}\) + 2Ag\(^{+}_{(aq)}\) \(\to\) Cu\(^{2+}_{(aq)}\) + 2Ag\(_{(s)}\)(i) State the species that is reduced(ii) Write half-cell equatio…
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1994
(a) Give one example each of a naturally occurring substance that;(i) conforms to the general formula C(_x\)(H\(_2\)O)\(_y\);(ii) contains the carboxyl group as its functional group.(b) Name the process for obtaining: (i…
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1994
A shortened form of the Periodic Table is shown below. Use it to answer questions (a) and (b)(a) Which of the elements represented as A to E in the table, above is:(i) transition metal;(ii) an alkaline earth meta(iii) th…
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1994
(1)(a) State Avogadro's law(b) Which of the state of matter contains particles that are: (i) readily used(ii) held firmly together by some forces of cohesion;(iii) involved in rapid random motion?
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1994
(a) State two differences in the chemical properties of metals and non-metals.(b) List two general methods of extract metals from their ores.
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1994
A measure of the degree of disorder in a chemical system is known as the
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1994
Catalytic hydrogenation of alkenes produces compounds with the general formula
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1994
The number of replaceable hydrogen atoms in one acid indicates its
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