1995
All your burette readings (initial 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 answer book.A is a solutio…
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1995 WAEC SSCE Chemistry Past Questions
1995
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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1995
(a) Use the following reaction scheme to answer Questions;(i) - (iii) below:Reaction 1: \[ \text{2 PbO (s)} \xrightarrow{\Delta} \text{2 Pb (s)} + \text{O}_2 (g) \]Reaction 2: \[ \text{PbO (s)} + \text{2 HNO}_3 (aq) \r…
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1995
(a)(i) Explain what is meant by saturated solution(ii) Describe in outline, a suitable procedure for preparing a saturated solution of sodium trioxonitrate(V) at 30°C.(ii) State two techniques that can be used to recover…
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1995
(a) List three properties of a system that is in a state of chemical equilibrium.(b) Consider reaction represented by the following equation: 3H\(_{2(g)}\) + N\(_{2(g)}\) \(\rightleftharpoons\) 2NH\(_{3(g)}\); H = 92KJ(i…
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1995
(a)(i) What is isomerism?(ii) Name the alkanol that is isomeric with methoxymethane (CH\(_3\)OCH\(_3\)).(b)(i) Outline the laboratory:preparation of ethylethanoate. (Diagrams not required)(ii) Write the structural formul…
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1995
(a)(i) List the three types of particles present in atoms.(ii) name the element which does not contain all the three particles in its atom. Mention the particle that is not present.(b) Give the reason why:(i) the relativ…
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1995
(a) List two differences between solids and liquids.(b) The graph below is the heating curve for a solid X. Use the graph to answer Questions (i) (iii) below.(i) What is the melting point of X?(ii) If the vapour of X is…
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1995
(a) Mention one process apart from respiration, which increases the amount of carbon (IV) oxide in the atmosphere.(b)(i) State one use of sodium hydrogentrioxocarbonate (IV).(ii) Write an equation to show the action of h…
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1995
(a) What is the change in oxidation state of chromium in the reaction represented by the following equation?3SO\(_2\) + Cr\(_2\)O\(^2_{-7}\) + 2H\(^+\) -> 3SO\(_4^{2-}\) + 2Cr\(^{3+}\) + H\(_2\)O(b) Use the half equat…
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1995
(a) Mention the chemical substance manufactured starting from each of the foirownc sets of materials:(i) sugar and yeast;(ii) ammonia, air and water;(iii) vegetable oil and caustic alkali.(b) State one air pollutant gene…
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1995
(a) Name the device used for producing an electric current from a chemical(b) Copy and complete the table below.ElectrolyteProduct at the anode (carbon)Product at the cathode (carbon)Dilute NaCl\(_{(aq)}\)Concentrated Na…
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1995
(a) State the type of reaction involved in the conversion of:(i) proteins.to amino acids:(ii) ethanol to ethene;(iii) benzene to bromobenzene(b) Write an equation to show that ethene reasts with hydrogen in the presence…
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1995
(a)(i) Sketch a graph to illustrate Charles' law.(ii) A gas occupies 500 cm\(^{ 3}\) at 2TC. calculate its volume at 40°C constant pressure.(b) List two gases that are used as refrigerant
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1995
(a)(i) Explain the term pH(ii) If sodium hydroxide solution were added to a solution of a strong acid, what would happen to the pH of the solution?(b) Give one example of each of the following:(i) acidic oxide(ii) acid s…
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1995
What name is given to each of the following? The(a) irregular random movement of smoke particles in air.(b) existence of an element in various forms in the same physical-state(c) disintegration of atomic nuclei, accompan…
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1995
(a) State three reasons why air is classified as a mixture.(b) List two methods that can be used to separate a mixture of iodine crystals and iron filings.
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1995
Which of the following cannot be deduced from the electronic configuration of a transition metal?
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1995
Which of the following molecules is linear in shape?
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1995
If a solid has a low melting point and dissolves readily in benzene, it would probably
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