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A-Level Chemistry (9701) Paper 4 Mock: Moles, pH, Titration, Equilibrium, Organic, Transition Metals
TUTORZONE ORIGINAL MOCK PAPER · CAMBRIDGE A LEVEL CHEMISTRY (9701) PAPER 4 (A2 STRUCTURED)
Written to the Cambridge 9701 syllabus (2025-2027): Paper 4 (A Level structured) is 100 marks over 2 hours, 38.5% of the A Level. This is a Paper 4 mock: 10 questions for 100 marks (calculation and concept) with answers.
What is in the A-Level Chemistry (9701) exam?
Direct answer: A Level candidates sit five papers: Paper 1 (MC 40), Paper 2 (AS structured 60, 1 h 15), Paper 3 (practical 40, 2 h), Paper 4 (A2 structured 100, 2 h) and Paper 5 (planning 30, 1 h 15).
Assessment at a glance (2027)
| Component | Content | Weighting | Duration |
|---|---|---|---|
| Paper 4 (A Level structured) | Structured questions, 100 marks | A Level 38.5% | 2 h |
| Paper 5 (Planning, Analysis and Evaluation) | Two compulsory questions, 30 marks | A Level 11.5% | 1 h 15 min |
| Paper 1/2/3 (AS level) | MC 40 + structured 60 + practical 40 | AS 100% | 1h15 / 1h15 / 2h |
Ten questions in 2 hours is about 11 minutes each. For calculations write the formula (n = m/M, pH = -log[H+]), then substitute, then give the unit; for concepts give the definition and an example.
How this paper was built
This is a TutorZone original mock paper: the questions follow the Cambridge 9701 structure (Paper 4 A2 structured, 100 marks, 2 h) and the answers are our own computations, not Cambridge past papers or marking references.
Every answer was recomputed programmatically.
Pacing
| Section | Marks | Suggested time | What to do first |
|---|---|---|---|
| Paper 4 (A Level structured) | A Level 38.5% | about 11 min per question, 10 to check | formula for calculations, definition for concepts |
| Paper 5 (Planning, Analysis and Evaluation) | A Level 11.5% | about 35 min per question | design, analyse, evaluate |
| Paper 1/2/3 (AS level) | AS 100% | AS underpins A2 | A2 builds on AS content |
How do I calculate pH?
Direct answer: pH = -log10[H+]. E.g. [H+] = 0.01 mol/dm^3 gives pH 2.
Paper 4: structured questions (10 questions, 100 marks)
All compulsory; aim for 110 minutes with 10 to check. Formula for calculations, definition for concepts.
Question 1 (10 marks)
How many moles are in 10 g of sodium hydroxide (NaOH, molar mass 40 g/mol)?
Question 2 (10 marks)
0.25 mol of solute is dissolved in 0.5 dm^3 of solution. Calculate the concentration.
Question 3 (10 marks)
A solution has a hydrogen-ion concentration of 0.01 mol/dm^3. Calculate its pH.
Question 4 (10 marks)
In a titration, 25 cm^3 of 0.1 mol/dm^3 hydrochloric acid is exactly neutralised by 25 cm^3 of sodium hydroxide (1:1). Calculate the concentration of the sodium hydroxide.
Question 5 (10 marks)
0.5 kg of water (specific heat capacity 4.18 J/(g °C)) rises 10 °C. Calculate the energy absorbed, in kJ.
Question 6 (10 marks)
Write the expression for the equilibrium constant Kc, and state the only factor that affects Kc.
Question 7 (10 marks)
State the difference between aldehydes and ketones in structure and in their ability to be oxidised.
Question 8 (10 marks)
Describe the structure of benzene and explain why it is more stable than a typical alkene.
Question 9 (10 marks)
Give two characteristic properties of transition metals, with an example of each.
Question 10 (10 marks)
State the use of standard electrode potentials, and write the formula for the cell EMF (E°cell).
What affects Kc?
Direct answer: Kc depends only on temperature, not on concentration or pressure.
Paper 4 answers
Question 1
Use n = m/M (3): n = 10 / 40 = 0.25 mol (7).
Question 2
Use c = n/V (3): c = 0.25 / 0.5 = 0.5 mol/dm^3 (7).
Question 3
Use pH = -log10[H+] (3): pH = -log10(0.01) = 2 (7).
Question 4
Use c1V1 = c2V2 (3): c2 = 0.1 x 25 / 25 = 0.1 mol/dm^3 (7).
Question 5
Use q = mc delta-T (3): q = 500 x 4.18 x 10 = 20900 J = 20.9 kJ (7).
Question 6
Kc = [products] / [reactants] (raised to the stoichiometric powers) (6); Kc is affected only by temperature (4).
Question 7
(1) Aldehydes: the carbonyl is at the end of the chain (RCHO) and can be oxidised to a carboxylic acid (5). (2) Ketones: the carbonyl is inside the chain (RCOR’) and are generally not oxidised (5).
Question 8
Benzene (C6H6) is a planar hexagonal ring with equal C-C bond lengths and delocalised electrons (6); the delocalisation makes it more stable than an alkene with localised double bonds (4).
Question 9
(1) Variable oxidation states – e.g. iron has +2 and +3 (5). (2) Formation of complexes – e.g. [Cu(H2O)6]2+ is blue (5).
Question 10
They compare the oxidising/reducing ability of half-cells and predict reaction direction (5); E°cell = E°(cathode) – E°(anode) (5).
What is the difference between aldehydes and ketones?
Direct answer: an aldehyde’s carbonyl is at the chain end (RCHO) and can be oxidised to a carboxylic acid; a ketone’s is inside the chain (RCOR’) and is generally not oxidised.
Where these marks are usually lost
| Mistake | What it looks like | What it costs | Instead |
|---|---|---|---|
| Wrong pH sign | pH = log[H+] | pH is the negative logarithm | pH = -log10[H+] |
| Kc and pressure | Saying Kc changes with pressure | Kc depends only on temperature | Kc depends only on temperature |
| Aldehyde vs ketone | Treating ketones as oxidisable | Ketones are generally not oxidised | Aldehydes oxidise, ketones do not |
How to use this paper
First sit: the full 2 hours on all 10 questions with no references.
Mark it: check formula, substitution, unit and definitions.
Second sit: redo three to seven days later, aiming to finish inside 1 h 45 min.
What should I do after finishing this paper?
Direct answer: log questions with formula errors or missing concepts; redo in three to seven days; and drill Paper 5 planning questions.
FAQ
Is this a Cambridge paper?
No. The questions and answers are TutorZone originals, not Cambridge past papers or marking references.
How many papers does A-Level Chemistry have?
A Level candidates sit five: Paper 1 (MC 40), Paper 2 (AS structured 60), Paper 3 (practical 40), Paper 4 (A2 structured 100) and Paper 5 (planning 30).
How much is Paper 4 worth?
Paper 4 is 38.5% of the A Level – the largest single paper.
Official references
| Resource | What to check |
|---|---|
| Cambridge A Level Chemistry 9701 syllabus (2025-2027) | Confirm the Paper 1-5 marks and times |
| https://www.tutorzone.com.hk/en-alevel-chemistry-9701-paper-2-mock-2027/ | A-Level Chemistry Paper 2 (AS structured) drilling mock |
| https://www.tutorzone.com.hk/en-alevel-physics-9702-paper-4-mock-2027/ | A-Level Physics (9702) Paper 4 mock |
Related: practice area · A-Level Chemistry Paper 2 drilling mock · A-Level Physics Paper 4 mock · IGCSE Chemistry Paper 4 mock
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