WAEC SSCE Chemistry Paper 1 Sample 2023
This paper mirrors the rigorous style and breadth of real WAEC Chemistry examinations, testing your ability to recall facts, apply atomic theory, and reason through unfamiliar scenarios under time pressure—the exact skills that separate pass grades from distinctions. You'll encounter questions on atomic structure and periodicity, chemical bonding and stoichiometry, and acid-base equilibria, presented in the multiple-choice and short-answer formats that dominate the external exam. The mix of straightforward recall, calculation-based reasoning, and conceptual application means there's no shortcut: you have to understand *why*, not just memorize *what*. By the end, you'll spot the common trap answers instantly and know exactly how examiners word questions to catch out careless reasoning.
Questions in this quiz
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- Question 1
Which of the following elements has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁵?
- Question 2
Which of the following statements about ionization energy is true?
- Question 3
The first ionization energy of magnesium is 738 kJ/mol, and the second ionization energy is 1451 kJ/mol. What is the main reason for this large increase?
- Question 4
A covalent bond is formed between two atoms when they _______ electrons in their outer shells.
- Question 5
What is the empirical formula of a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?
- Question 6
Which of the following is the correct Lewis structure representation for a molecule in which a central atom forms a double bond with each of two identical atoms?
- Question 7
Calculate the number of moles of NaOH required to neutralize 50 mL of 0.1 M HCl. (Assume 1:1 molar ratio.)
- Question 8
The pH of a solution is 3. What is its hydrogen ion concentration?
- Question 9
Which one of the following salts, when dissolved in water, produces an acidic solution?
- Question 10
According to Le Chatelier's principle, if a system at equilibrium is subjected to an increase in temperature, the equilibrium will shift in the direction that absorbs heat.
- Question 11
A buffer solution is best defined as
- Question 12
Which element is most likely to form a stable, 2+ ion?
- Question 13
If 2.4 g of carbon reacts with excess oxygen to form carbon dioxide, how many moles of CO₂ are produced? (Atomic mass: C = 12, O = 16)
- Question 14
The polarity of a covalent bond is determined by the _______ of the bonding atoms.