2021
(a)i. With the aid of an equation, explain briefly why aluminum metal is not affected by air.(ii) In the extraction of aluminum from bauxite, state the: - substance used for purifying the ore; - composition of the mixtur…
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2021 WAEC SSCE Chemistry Past Questions
2021
(a) What is the structure of:(i) graphite: (ii) diamond (ii) Explain briefly why diamond is hard and a non-conductor of electricity while graphite is soft and an electrical conductor,(b)i. State what is achieved at each…
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2021
(a) In an experiment, 25.0 cm\(^{3}\) of H\(_{2}\)SO\(_{4}\) completely neutralized 24.0 cm\(^{3}\) of a 0.1 50 mol dm\(^{-3}\) aqueous KOH using a suitable indicator.(i) Write a balanced chemical equation for the reacti…
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2021
(a)i. State two characteristics of a homologous series.(ii) Explain briefly why there are differences in the reaction of ethane and ethene.(b) When crystals of sodium chloride were warmed with concentrated tetraoxosulpha…
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2021
(a) Distinguish between molecular formula and structural formula(b) List three factors that determine the ionization energy of an atom.(c) State the two conditions necessary for the establishment of a chemical equilibriu…
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2021
Which of the following scientists discovered the electrons?
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2021
A coordinate covalent bond could be formed between?
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2021
Electrovalent compounds normally ------------
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2021
Which of the following statements about elements in Group VII is correct?
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2021
Which of the following pairs of molecules form hydrogen bonds?
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2021
The isotopes of neon are represented by the symbols \(^{20}\)\(_{x}\) Ne, \(^{21}\)\(_{y}\) Ne, and \(^{22}\)\(_{z}\) Ne. The relationship between x, y, and z is?
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2021
How many molecules of oxygen would occupy a volume of 2.24 cm\(^{3}\) at s.t.p?[Molar volume at s.t.p = 22,400 cm\(^{3}\), Avogadro's number = 6.02 x 10\(^{23}\)]
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2021
Consider the following energy profile diagram and use it to answer the question that followsThe energy profile diagram illustrates-------------
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2021
Consider the following energy profile diagram and use it to answer the question that followsThe enthalpy change of the reaction is------------
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2021
Consider the following energy profile diagram and use it to answer the question that followsThe activation energy of the reaction is
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2021
Protons and electrons are called fundamental particles because they----------
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2021
The region around the nucleus where electrons can be located is called?
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2021
The following ions have the same electron configuration except\(_{8}\)O,\(_{12}\)Mg,\(_{13}\)AI,\(_{17}\)CI
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2021
An element, Q, contains 69% of\(^{63}\)Q and 31% of \(^{65}\)Q. What is the relative atomic mass of Q?
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2021
Potassium trioxonitrate(V) can be obtained from its solution by----------
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