Cambridge Chemistry 9701 Paper 1, Paper 2 and Paper 4: How to Practise

The same content can require different work in the three papers. Paper 1 demands rapid decisions, Paper 2 requires visible reasoning, and Paper 4 connects several AS and A Level areas.

The three papers at a glance

Three papers, three kinds of exam work

1

Paper 1

Decision

• 40 questions
• Rapid elimination
• Why the distractor was wrong

2

Paper 2

Built AS answer

• Calculation route
• Short, precise explanation
• Visible intermediate steps

3

Paper 4

Connection

• AS base + A Level content
• Several topics
• Longer problem solving

Paper	Time	Marks	Primary examination work
Paper 1	1 hour 15 minutes	40	Fast, accurate decisions across 40 multiple-choice questions
Paper 2	1 hour 15 minutes	60	AS calculations and structured responses
Paper 4	2 hours	100	Connected A Level problem solving with AS knowledge required

These are not three different kinds of chemistry. A mole calculation may appear as rapid proportional reasoning in Paper 1, a complete calculation in Paper 2 and one step within a multi-topic Paper 4 problem. Practice must therefore develop knowledge and response format together.

Paper 1: record more than the correct letter

After each question, record the decisive chemical relationship, why your chosen distractor was attractive, whether the answer was secure or an informed guess, and whether knowledge or time caused the error.

The decisive principle is that a catalyst provides a lower-activation-energy route in both directions. Equilibrium is reached sooner, but Kc does not change at constant temperature. C is defensible. A and B confuse reaching equilibrium faster with changing equilibrium composition; D ignores the two directions of a reversible reaction.

During correction, the correct letter is not enough. Write the sentence that eliminated each alternative. Use short timed blocks to measure decision time and the source of delay. A practised skip-and-return rule is more useful than forcing one universal number of seconds onto every item.

Paper 2: a short answer must still be complete

A useful explanation frame is claim → chemical or particle-level reason → consequence → answer to the question. Sentences need not be long, but the decisive relationship must be visible.

Weak answer: “Magnesium oxide has stronger ionic bonds.”

Improved answer: “The MgO lattice contains Mg²⁺ and O²⁻ ions, whereas the NaCl lattice contains Na⁺ and Cl⁻ ions. The greater ionic charges produce stronger electrostatic attraction between oppositely charged ions in MgO. More energy is required to overcome these attractions, so MgO has the higher melting point.”

The improved response uses a common basis of comparison, identifies charge, states the direction of attraction and connects it to energy. “Stronger” now has a defined meaning.

Make the calculation auditable

1. Write the equation or starting relationship.
2. Record data in suitable units.
3. Show the stoichiometric or mathematical connection.
4. Preserve at least one intermediate value.
5. Round at the end, attach a unit and check the order of magnitude.

First write the volume as 0.0250 dm³. Then n(NaOH) = cV = 0.200 × 0.0250 = 0.00500 mol. The equation HCl + NaOH → NaCl + H₂O gives a 1:1 amount ratio, so n(HCl) = 0.00500 mol. The unit conversion, relationship and mole ratio can each be checked.

When an answer is wrong, do not edit only the final value. Identify the first of these five lines that failed. That turns the calculation into a specific training task.

Paper 4: do not keep AS and A Level content in separate boxes

Paper 4 is based on A Level syllabus content and requires knowledge of AS content. Topics 23–37 cannot be treated as an isolated second book. Practise links: equilibrium with energetics; rate with experimental data; organic transformation with spectra; mechanism with reaction conditions.

The reasoning network in a Paper 4 question

Identify and transform an unknown organic compound

1. 1Structural information from a spectrum
2. 2Identify the functional group
3. 3Choose reagent and conditions
4. 4Justify the mechanism or product

For an unknown organic compound, spectral evidence may first provide structural information, which supports a functional-group identification, then reagent and condition selection, then justification of a product or mechanism. If each link exists only as a memorised pair, a new context can break the chain.

After correcting a Paper 4 question, draw its topic connections. Replace “organic chemistry” with “I recognised an O–H absorption but did not connect the group to the required oxidation reagent.”

A sixty-minute weekly practice block

A 60-minute weekly practice block

Paper 115 min

Paper 220 min

Paper 420 min

Error log5 min

• 15 minutes Paper 1: a short mixed block plus reasons for distractors.
• 20 minutes Paper 2: one structured calculation or explanation with visible intermediate steps.
• 20 minutes Paper 4: one connected problem or a reconstruction of its reasoning network.
• 5 minutes error log: first failed step, repair task and retry date.

This allocation is a repeatable training frame, not an official Cambridge recommendation. Adjust the emphasis for an approaching assessment, but preserve correction time.

What should the error log contain?

Do not record only “equilibrium” or “organic chemistry”. Record the first observable divergence:

• “I did not derive the exponents in Kc from the stoichiometric coefficients.”
• “My curly arrow did not begin at the electron pair.”
• “The explanation did not connect structure back to the property asked.”
• “I did not convert cm³ to dm³ before using cV.”

Attach a short repair task and dated retry to every entry. Use the Paper 3 and Paper 5 skills guide for the parallel practical system. The Chemistry 9701 overview places these papers within the AS and A Level routes.