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Q1. What is the relative charge and relative mass of a proton?
A. Charge +1, relative mass 1
B. Charge -1, relative mass 1
C. Charge +1, relative mass 1/1836
D. Charge 0, relative mass 1
Show answer & explanation
✓ Answer: A. Charge +1, relative mass 1
A proton has a relative charge of +1 and a relative mass of 1 (approximately 1.67 x 10^-27 kg, the reference mass unit). The electron has the tiny mass of 1/1836, not the proton, which is a common mix-up.
Q2. Which statement about bond enthalpies used in Hess's law calculations is correct?
A. Mean bond enthalpies are averaged over many different molecules, so calculations using them give only approximate values
B. Bond enthalpies are always exact for every molecule containing that bond type
C. Bond breaking is exothermic and bond forming is endothermic
D. Bond enthalpy calculations give more reliable values than using enthalpies of formation
Show answer & explanation
✓ Answer: A. Mean bond enthalpies are averaged over many different molecules, so calculations using them give only approximate values
Mean bond enthalpies are averages taken across a range of different compounds, so the specific bonding environment in a molecule causes the calculated ΔH to differ from the experimental value. Bond breaking actually requires energy (endothermic) while bond forming releases energy (exothermic) — the reverse of option C.
Q3. 25.0 cm3 of a solution of Fe2+ required 22.50 cm3 of 0.0200 mol dm-3 acidified KMnO4 for complete oxidation, following MnO4- + 5Fe2+ + 8H+ → Mn2+ + 5Fe3+ + 4H2O. What is the concentration of the Fe2+ solution in mol dm-3?
A. 0.0180 mol dm-3
B. 0.0900 mol dm-3
C. 0.0225 mol dm-3
D. 0.1125 mol dm-3
Show answer & explanation
✓ Answer: B. 0.0900 mol dm-3
Moles MnO4- = 0.02250 dm3 × 0.0200 mol dm-3 = 4.50 × 10-4 mol; moles Fe2+ = 5 × 4.50 × 10-4 = 2.25 × 10-3 mol; concentration = 2.25 × 10-3 / 0.0250 = 0.0900 mol dm-3. Forgetting to multiply by the 1:5 mole ratio gives the incorrect answer of 0.0180 mol dm-3.
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Who has to sit the A-Level Chemistry (AQA)
Who needs a A-Level Chemistry (AQA)?
Essential for university degrees in Medicine, Veterinary Science, Dentistry, Pharmacy, Biochemistry, and Chemical Engineering.
The real A-Level Chemistry (AQA): format
How long is the A-Level Chemistry (AQA)?
The real A-Level Chemistry (AQA) lasts 360 minutes. Our mock uses 40 questions in 60 minutes.
What is the A-Level Chemistry (AQA) pass mark?
Real exam pass mark: 66/300 marks (Grade E, 22% of total) for 2026 examination series. Our mock marks you at 24 out of 40, the threshold we mark against.
What it costs, and what a resit costs
How much does the A-Level Chemistry (AQA) cost?
Real exam fee: £121.90 (AQA board fee for summer 2027). Resit fee: £340–£450 (private candidate exam & centre fees for written papers, June 2027). Rebooking after a fail: Approx. one year (only summer series available for resits)
How hard is it
What is the A-Level Chemistry (AQA) pass rate?
Real exam first-time pass rate: 95.7% (A*-E for AQA A-Level Chemistry, 2026). Difficulty: High; significant step up from GCSE, requiring effort, complex problem-solving, and strong maths application.
Why people fail it
Why do people fail the A-Level Chemistry (AQA)?
Failure to convert units (e.g., temperature, pressure, activation energy) in calculations.
Lack of precision in language and definitions required by the mark scheme.
Figures for the real exam from google.com, vertexaisearch.cloud.google.com, checked October 2026. Fees and rules change, so confirm with the test provider before you book.
A-Level Chemistry (AQA): common questions
Frequently asked
How many questions are in the A-Level Chemistry (AQA)?
The exam has 40 questions. Every Revision Robin mock uses the same 40-question format so your practice matches the real thing.
Are these the real exam questions?
No. Our questions are original and written to match the current syllabus, so they give realistic practice without copying the official paper. Every answer comes with a plain-English explanation. Always confirm current rules and content with AQA.