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WAEC Chemistry – Sierra Leone

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Question 211

Which crystal system is characterized by three mutually perpendicular axes of unequal length?
Structure and properties of matterStructure and properties of mattermedium

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Question 212

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species is oxidized?
Redox reactionsRedox reactionsmedium

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Question 213

Which process occurs at the cathode during electrolysis?
ElectrochemistryElectrochemistrymedium

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Question 214

What is the empirical formula of a polymer formed by the repeated unit -CH2-CHCl-?
Polymer chemistryPolymer chemistryhard

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Question 215

Which property is typically associated with ionic compounds?
Structure and properties of matterStructure and properties of mattermedium

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Question 216

Which polymer is formed by the addition polymerization of ethene (ethylene)?
Polymer chemistryPolymer chemistryeasy

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Question 217

Calculate the mass of water produced when 2 moles of hydrogen gas react completely with oxygen gas.
Calculation chemistry (stoichiometry)Calculation chemistrymedium

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Question 218

In a reaction where the rate doubles when the concentration of reactant A is doubled, what is the order of reaction with respect to A?
Rates of reactions (kinetics)KIN05medium

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Question 219

Which type of polymerization involves the joining of monomers with the elimination of small molecules like water?
Polymer chemistryPOL09hard

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Question 220

In stoichiometry, how many moles of oxygen gas (O₂) are needed to completely react with 4 moles of propane (C₃H₈) in combustion? (Equation: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O)
Calculation chemistry (stoichiometry)CAL10hard

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