IB Chemistry — Practice Questions flashcards
6 of 60 questions free to study here · 6 topics · the whole deck is built into Willys
Multiple-choice practice on the syllabus, one best answer each, on atoms, the mole and gases, bonding, periodicity, energetics, kinetics, equilibrium, acids and bases, and redox.
Practice deck · part of IB Chemistry · written against: IB Diploma Programme IB Chemistry subject guide for first assessment 2025 (Structure and Reactivity); SL and HL in one deck, HL-only cards under subtopic tags starting HL. Updated 2026-10-10.
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The 6 sample questions as a list
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Which species contains 16 protons, 16 neutrons and 18 electrons?
A) ³⁴Cl⁻
B) ³⁴S²⁻
C) ³²S²⁺
D) ³²S²⁻D) ³²S²⁻Particulate Nature of Matter › Nuclear Atom
Sulfur has atomic number 16; mass number 32 gives 32 − 16 = 16 neutrons, and the 2− charge adds two electrons to make 18. ³⁴S²⁻ has 18 neutrons, and a 2+ ion would have only 14 electrons. -
Which compound has the largest lattice enthalpy?
A) Potassium chloride, KCl
B) Magnesium oxide, MgO
C) Sodium fluoride, NaF
D) Calcium oxide, CaOB) Magnesium oxide, MgOBonding and Structure › Ionic Model
Lattice enthalpy is largest for high ionic charges and small ionic radii. MgO and CaO both have 2+ and 2− ions, but Mg²⁺ is smaller than Ca²⁺, so the attraction in MgO is stronger. -
Which period 3 oxide dissolves in water to form an alkaline solution?
A) Al₂O₃
B) P₄O₁₀
C) SO₂
D) Na₂OD) Na₂OClassification of Matter › Periodic Table
Sodium oxide is a basic oxide: Na₂O + H₂O → 2 NaOH. Aluminium oxide is amphoteric and insoluble in water, while the oxides of phosphorus and sulfur are acidic and form acidic solutions. -
Burning 0.0100 mol of a fuel raises the temperature of 200 g of water (c = 4.18 J g⁻¹ K⁻¹) by 15.0 K. Which expression gives the enthalpy change of combustion, in kJ mol⁻¹?
A) +(200 × 4.18 × 15.0) ÷ (1000 × 0.0100)
B) −(200 × 4.18 × 15.0) ÷ (1000 × 0.0100)
C) −(200 × 4.18 × 288) ÷ (1000 × 0.0100)
D) −(200 × 4.18 × 15.0) ÷ 0.0100B) −(200 × 4.18 × 15.0) ÷ (1000 × 0.0100)What Drives Reactions › Enthalpy Changes and Cycles
Q = mcΔT gives joules, so divide by 1000 for kJ and by the amount of fuel for per mole; the sign is negative because combustion is exothermic. ΔT is a temperature change, so 15.0 K is used, not 288. -
2.0 mol of hydrogen reacts with 2.0 mol of oxygen: 2 H₂(g) + O₂(g) → 2 H₂O(l). Taking M(H₂O) as 18.0 g mol⁻¹, what is the maximum mass of water that can form?
A) 36.0 g
B) 54.0 g
C) 18.0 g
D) 72.0 gA) 36.0 gHow Much How Fast How Far › Amount of Change
2.0 mol of H₂ needs only 1.0 mol of O₂, so hydrogen is limiting and gives 2.0 mol of water: 2.0 × 18.0 = 36.0 g. Treating oxygen as limiting gives 4.0 mol of water, or 72.0 g, which is impossible. -
In the reaction HCO₃⁻ + H₂O ⇌ CO₃²⁻ + H₃O⁺, which pair is a conjugate acid–base pair?
A) HCO₃⁻ and H₃O⁺
B) HCO₃⁻ and H₂O
C) HCO₃⁻ and CO₃²⁻
D) H₂O and CO₃²⁻C) HCO₃⁻ and CO₃²⁻Reaction Mechanisms › Proton Transfer
A conjugate pair differs by one proton: HCO₃⁻ donates H⁺ to become CO₃²⁻. The other conjugate pair is H₃O⁺ and H₂O; HCO₃⁻ and H₃O⁺ are both acids, not a conjugate pair.
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About these cards
Review status: Second-reader reviewed, with corrections applied.
Checked against:
- IB Diploma Programme subject guide (topic outline only; no text copied): Chemistry guide for first assessment 2025 (Structure and Reactivity), SL and AHL.
- OpenStax Chemistry 2e, consulted as a reference; no text copied.
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