The West African Examinations Council (WAEC) is a major examination board responsible for conducting the West African Senior School Certificate Examination (WASSCE). One of the core subjects tested in WASSCE is Chemistry, a science that explores the composition, structure, properties, and changes of matter. Scoring high in this exam requires preparation, and having a good grasp of past questions can be an invaluable resource.
This article presents a comprehensive guide to WAEC Chemistry 2024, including tips for tackling both theory and objective questions, with example answers and solutions that align with WAEC’s standards.
WAEC Chemistry 2024 Objective Section
The objective section typically contains multiple-choice questions (MCQs) testing various topics across the Chemistry syllabus. This section requires fast thinking and accuracy since each question carries equal marks. Below are example questions you might encounter:
Sample WAEC Chemistry Objective Questions (2024)
- Which of the following gases is the most abundant in the Earth’s atmosphere?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. ArgonAnswer: B. Nitrogen - What is the main ore of aluminum?
A. Bauxite
B. Haematite
C. Galena
D. MagnetiteAnswer: A. Bauxite - In a redox reaction, reduction occurs when there is a/an:
A. Gain of electrons
B. Loss of electrons
C. Gain of neutrons
D. Loss of protonsAnswer: A. Gain of electrons - Which of the following is a noble gas?
A. Helium
B. Hydrogen
C. Nitrogen
D. OxygenAnswer: A. Helium
WAEC Chemistry 2024 Theory Section
The theory section requires detailed written answers and problem-solving abilities. Questions are designed to test the depth of your knowledge of the subject and your ability to apply this knowledge in practical situations. Each question may cover different areas of Chemistry, including Organic Chemistry, Electrolysis, Chemical Equations, and Stoichiometry.
Sample WAEC Chemistry Theory Questions and Answers
Question 1:
(a) Define electrolysis.
(b) Using a labeled diagram, describe the electrolysis of water.
(c) What are the products at the anode and cathode in the electrolysis of water?
Answer:
(a) Electrolysis is a chemical process by which electric current is passed through a substance to cause a chemical change. The substance must be in a molten state or dissolved in water for electrolysis to occur.
(b) Diagram: (Students can draw a simple diagram showing two electrodes dipped into water with a battery connected).
In the electrolysis of water, the setup involves two electrodes (anode and cathode) submerged in water mixed with a small amount of sulfuric acid to enhance conductivity. When electric current is passed through, water decomposes into oxygen and hydrogen gas.
(c) At the anode (positive electrode), oxygen gas is released, and at the cathode (negative electrode), hydrogen gas is produced.
Question 2:
(a) Explain the term “mole” as used in Chemistry.
(b) Calculate the number of moles in 18g of water (H₂O).
(Atomic masses: H = 1, O = 16)
Answer:
(a) A mole is the amount of substance that contains as many particles (atoms, ions, or molecules) as there are atoms in 12 grams of carbon-12. It is the SI unit used to measure the amount of substance and is equivalent to Avogadro’s number, 6.022×10236.022 \times 10^{23}.
(b) The molar mass of water (H₂O) is:
H₂O = 2(1) + 16 = 18 g/mol
Therefore, the number of moles in 18g of water is:
Number of moles = 18g18g/mol=1\frac{18 g}{18 g/mol} = 1 mole
Question 3:
Describe the laboratory preparation of hydrogen gas and write the balanced chemical equation for the reaction.
Answer:
Hydrogen gas can be prepared in the laboratory by the reaction between zinc and dilute hydrochloric acid. Zinc is added to the acid, and hydrogen gas is evolved, which can be collected over water.
Equation:
Zn+2HCl→ZnCl2+H2(g)Zn + 2HCl \rightarrow ZnCl_2 + H_2(g)
Tips for Scoring High in WAEC Chemistry
- Understand the Syllabus: Make sure you are familiar with the entire WAEC Chemistry syllabus, which covers topics from physical, inorganic, and organic chemistry.
- Practice Past Questions: Solve past questions to familiarize yourself with the exam format and frequently asked questions.
- Time Management: Develop the skill of managing your time well during the exam. Divide your time between the objective and theory sections.
- Learn Important Equations and Constants: Knowing key chemical formulas, equations, and constants will help in solving complex problems.
- Take Practice Tests: Simulate exam conditions by taking timed practice tests to boost confidence and improve speed.
FAQs About WAEC Chemistry 2024
- Q: How do I access WAEC Chemistry past questions and answers?
A: You can find past questions in WAEC-approved textbooks, online platforms, or download them from educational websites. Some free and paid resources offer past WAEC papers for all subjects. - Q: Are the WAEC Chemistry 2024 questions leaked online before the exam?
A: No, WAEC takes stringent measures to prevent exam leaks. Any website claiming to provide 100% sure answers before the exam is likely fraudulent. Trust only reliable resources and practice past questions to prepare adequately. - Q: What topics are most likely to appear in the WAEC Chemistry exam?
A: Topics that frequently appear include chemical bonding, electrolysis, stoichiometry, acids and bases, and organic chemistry reactions. Review past papers to identify patterns in the types of questions asked. - Q: How can I improve my performance in the practical aspect of Chemistry?
A: To excel in Chemistry practicals, familiarize yourself with laboratory apparatus and experiments. Practice drawing diagrams, recording observations, and writing balanced chemical equations for common experiments. - Q: What is the best strategy for tackling objective questions?
A: Read the questions carefully and eliminate obviously wrong options first. If unsure, use logical reasoning and your knowledge of Chemistry principles to deduce the correct answer.
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Conclusion
Success in WAEC Chemistry 2024 depends on early preparation, practicing with past questions, and understanding core concepts. Following the tips and sample questions provided above will help you gain confidence and increase your chances of scoring high in both the objective and theory sections of the exam. Keep studying, practice regularly, and approach the exam with a positive mindset.
Useful Links for Preparation:
Good luck with your preparation!
