2020
(a) A zinc salt, E when heated strongly, produced a brown gas with pungent smell, a colourless gas that rekindled a glowing splint, and a residue that was allowed to cool.(i) identify the salt E.(ii) Write an equation fo…
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2020 WAEC SSCE Chemistry Past Questions
2020
C is an organic compound. Carry out the following exercises on C. Record your observations and identity any gas(es) evolved. State the conclusions you draw from the results of each test.(a) Put about 10 drops of C on a w…
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2020
All your burette readings (initial and final), as well as the size of your pipette, must be recorded but no account of the experimental procedure is required. All calculations must be done in your answer booklet.A is a s…
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2020
.(a)(i) Name two gases that can be used to perform the fountain experiment. (ii) What is the aim of he fountain experiment? (iii) Describe briefly the fountain experiment.(b)(i) Name two chemical industries. (ii) State t…
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2020
(a) In an equilibrium reaction between gases Q and R, to form QR, the energy content of the reactants is 100 KJ and that of the product is 54 kJ. The energy content of the activated complex is 210 KJ.(i) Draw an energy p…
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2020
(a) In the laboratory preparation of dry chlorine gas, state the: I. reagents used; II. drying agent III. the mode of collection.(i) Write the equation for the preparation of chlorine gas. (iii) Write an equation to show…
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2020
Compound A:Compound B:(a) Consider the following compounds: (i) What is the relationship between the compounds labeled A and B? (ii) Name each of compounds A and B. (iii) Will the chemical properties of compounds A and B…
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2020
(a)(i) State Faraday's first law of electrolysis. (ii) Distinguish between a strong electrolyte and a weak electrolyte(b) State one chemical property of ethyne.(c)( i) What is meant by the tern unsaturated hydrocarbon? (…
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2020
An example of a biodegradable pollutant is?
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2020
Calcium chloride is an ionic compound. Which of the following statements account for its ionic character?I. Calcium has high ionization energy. II. Calcium has low ionization energy. III. Chlorine has high electron affin…
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2020
Dilution factor is the?
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2020
Which of the following quantities is a molar quantity?
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2020
Which of the following processes is not exhibited by atoms in order to attain more stable electron configuration?
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2020
The atomic number of an atom would be equal to its massnumber if it
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2020
How many electrons does \({31}_{15}\)P\(^3-\) contain?
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2020
Consider the reaction represented by the following equation:AgNO\(_3\)+ NaCl AgCl + NaNO\(_3\).The steps that could be taken to obtain pure dry sample of AgCI (s) from the mixture includes
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2020
The metallic bond in magnesium is stronger than that in calcium because magnesium has a
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2020
Which of the following arrangement of elements is in decreasing order of electronegativity?
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2020
Which of the following metals does not react with water to produce hydrogen?
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2020
"Electrons always occupy the lowest empty energy level" is a statement of
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