1997
All your burette readings (initial and final), as well as the size of your pipette, must be recorded but on no account of experimental procedure is required. All calculations must be done in your answer book.A is 0.50 mo…
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1997 WAEC SSCE Chemistry Past Questions
1997
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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1997
(a) Name one laboratory apparatus/set-up for:(i) determining the heat of neutralization:(ii) decomposing water into hydrogen and oxygen.(b) Outline a suitable procedure for distinguishing between glucose and cellulose us…
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1997
(a)(i) List three characteristic properties of transition metals(ii) 0.45g of a metal M was deposited when a current of 1.8 amperes was passed for 12.5 minutes through a solution containing M\(^{2+}\). Calculate the rela…
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1997
(a)(i) What is meant by cracking of petroleum fractions?(ii) Write an equation for the laboratory preparation of ethene from ethanol.(iii) Give one chemical test to distinguish between ethane and ethene.(b)(i) Name the c…
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1997
(a)(i) State two general methods of preparing soluble salts.(ii) Mention three pieces of apparatus required for determining the solubility of a salt at a given temperature.(b) The solubilities of two salts represented as…
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1997
(a)(i) List two reactants for the laboratory preparation of ammonia(ii) State three physical properties of ammonia(iii) Describe in outline, the manufacture of ammonia by the Haber process.(b) Write an equation in each c…
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1997
(a)(i) Define entropy(ii) What term is used to describe a reaction in which heat is absorbed from the surrounding?(b) State two conditions that can lead to ineffective collisions during a chemical reaction.
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1997
(a) Give one example of a metal which:(i) can displace hydrogen from cold water(ii) at red-heat, reacts reversibly with steam(iii) does not react with dilute hydrochloric acid(b) When dry hydrogen was passed over lead (I…
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1997
(a) Mention three chemical properties of chlorine(b) What type of reaction is represented by each of the following equations?(i) Mg\(_{(s)}\) + 2HCI\(_{(aq)}\) --> Mg\(_2\)Cl\(_{2(aq)}\) + H\(_{2(g)}\)(ii) Ag\(^+_{aq}…
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1997
(a) State Gay Lussac's law of combining volumes(b) Hydrogen reacts with oxygen according to the following equation;2H\(_{2(g)}\) + O\(_{2(g)}\) ---> 2H\(_2\)O\(_{(g)}\). If 50cm\(^3\) of hydrogen were sparked with 30c…
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1997
(a) List two products obtained when crude oil is refined(b)(i) What is the general formula for alkanols?(ii) State the type of reaction involved in the conversion of ethanol to ethanoic acid(iii) Write an equation to sho…
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1997
Consider the reaction represented by the following Q equation: N\(_2\)O\(_{4(g)}\) \(\rightleftharpoons\) 2NO\(_{2(g)}\) \(\Delta\)H = +57.2KJmol\(^{-1}\)(a) When is the reaction said to be at equilibrium?(b) Mention two…
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1997
(a) State two properties of alkalis(b)(i) Why is tetraoxosulphate (VI) acid able to produce two types of salt?(ii) Write an equation for the reactior involved on heating sodium trioxosulphate (IV) with hydrochloric acid.…
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1997
(a) List two industrial uses of concentrated tetraoxosulphate (VI) acid(b) The diagram below represents the set-up for the electrolysis of dilute tetraoxosulphate (VI) acid. Use it to answer Questions (i) to (iii).(i) W…
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1997
(a)(i) State the two main processes involved in the manufacture of oxygen from air(ii) Name the type of chemical bonding which exists between oxygen atoms in a molecule of oxygen(b) What term is used to describe the rela…
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1997
(a) List two properties of alpha particles.(b) X is an element which exists as an isotopic mixture containing 90% of \(^{39}_{19} X\) and 10% of \(^{41}_{19}X\).(i) How many neutrons are present in the isotope \(^{41}_{1…
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1997
What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
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1997
Radon is used as a tracer in medical research because it
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1997
How many unpaired electrons are there in an atom of an element with the following electronic configuration? 1s22s22p6
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