Cambridge AS & A Level Chemistry 9701: practical and examination skills for Papers 1–5

• Syllabus: 9701
• Papers: 1–5
• Skills: written + practical
• Examples: original

All examples on this page are written specifically for teaching. Use official Cambridge materials only through authorised sources, and carry out practical work only in a properly supervised laboratory.

Choose the paper to prepare

The same chemistry is expressed differently across the five papers

Papers 1–5: format, time and weighting

Chemistry 9701 papers and weightings

Paper	Format	Time	Marks	Main demand
1	Multiple Choice	1 h 15 min	40	Fast, accurate selection
2	AS Level Structured Questions	1 h 15 min	60	Calculate, explain and apply
3	Advanced Practical Skills	2 h	40	Perform, record and analyse
4	A Level Structured Questions	2 h	100	Integrated structured reasoning
5	Planning, Analysis and Evaluation	1 h 15 min	30	Written planning and evaluation

Content revision alone cannot address every demand. Weak proportional reasoning might produce a calculation error in Paper 2, a dilution mistake in Paper 3 and a poorly chosen variable range in Paper 5. Conversely, a low Paper 1 score does not prove weak knowledge until timing, distractors and working habits have been inspected.

AS candidates take Papers 1–3. The full A Level uses Papers 1–5 through an eligible staged route or in one series. If the route is unclear, return to the 9701 programme overview before choosing practice.

Diagnose performance through six trainable skills

Six trainable skills

1. 1Retrieve

   Bring forward facts and conditions

2. 2Select

   Choose the model or method

3. 3Represent

   Use equations, tables and graphs

4. 4Reason

   Link evidence to a conclusion

5. 5Execute

   Work with apparatus, numbers and time

6. 6Review

   Test plausibility and revisit any step

Retrieve accurate facts and conditions. Select the relationship or model that fits. Represent with formulae, equations, mechanisms, tables, graphs and units. Reason from evidence through explicit chemical steps. Execute accurately with apparatus, numbers and time. Review whether the answer is chemically and practically plausible.

In a rate investigation, a student may retrieve collision theory, select concentration as the independent variable, represent data on a graph, reason from gradient, execute consistent timing and review an anomalous reading. “Knowing rates” covers only one part of that sequence. These six labels are a teaching framework, not Cambridge assessment-objective names.

Paper 1: make each option earn its place

Use four passes through a single question. First name the exact target: quantity, species, trend or statement. Predict the result or direction before comparing options where sensible. Test every option using chemistry, units, limiting cases or a short calculation. During review, record why the selected distractor looked plausible.

Tutor-created example: after dilution

A solution is diluted only by adding solvent. What happens to the number of solute particles and to concentration?

ASolute particles decrease because volume rises.

What it assumes: Confuses concentration with total particle count.

How to test it: Track amount before and after solvent is added.

BSolute particles stay constant; particles per unit volume fall.

What it assumes: Distinguishes amount from concentration.

How to test it: Check whether any solute was added or removed.

CBoth particle count and concentration rise.

What it assumes: Is attracted to the larger volume number.

How to test it: Predict the direction before comparing options.

Timing should come from the student’s own practice data. Do not pretend every item deserves the same number of seconds. Train a deliberate skip-and-return rule before the examination. In review, separate knowledge, reasoning, arithmetic and time causes.

A distractor log should record the topic, selected option, correct idea, why the wrong option was attractive and one rule for the next attempt. The useful question is not “Why was I silly?” but “Which assumption did I fail to test?”

Papers 2 and 4: give the examiner the chemical link, not a cloud of related facts

Definitions need the scientific relationship and conditions that distinguish the term. Compare wording with the current syllabus and authorised guidance; do not memorise shorthand without understanding the meaning.

For explain questions, state the observation or claim, the relevant chemical principle and the link to the stated result. For compare, use the same basis and direct paired language. For predict and justify, separate the prediction from evidence: name the spectral feature, track electron movement and charge, or identify the equilibrium change and response.

Teaching example: a complete explanation chain

1. 1Claim or observation
2. 2Chemical principle
3. 3Link to this result

Incomplete: The rate is faster because there are more collisions.

Improved: At the higher concentration, there are more reactant particles per unit volume, so successful collisions occur more frequently and the reaction rate increases.

A list of related facts may contain correct chemistry while still omitting the requested relationship. Before moving on, reread the exact comparison or cause and ask whether every sentence earns its place.

Make every calculation possible to audit

Use five lines: Target, Known, Relationship, Substitution, Check. Preserve units beside values, write the balanced-equation mole ratio, distinguish concentration from amount, convert cm³ to dm³ when required, retain extra calculator figures until the end and test the order of magnitude.

Calculation audit: final number versus traceable chain

Final number only

−66.9

The unit, relationship and conversion are invisible.

1. TargetEnthalpy change in kJ mol⁻¹
2. Knownm = 50.0 g; c = 4.18 J g⁻¹ K⁻¹; ΔT = 6.4 K; n = 0.0200 mol
3. Relationshipq = mcΔT; ΔH = −q/n for an exothermic reaction
4. Substitutionq = 50.0 × 4.18 × 6.4 = 1337.6 J = 1.3376 kJ
5. CheckΔH = −1.3376/0.0200 = −66.9 kJ mol⁻¹; the negative sign is consistent

Show unit trail

g × J g⁻¹ K⁻¹ × K = J; J ÷ 1000 = kJ; kJ ÷ mol = kJ mol⁻¹.

The example shows why sign needs chemical interpretation. The solution gains heat, so its calculated q is positive; the reacting system releases that energy, hence the reaction enthalpy is negative. A correct number with an invisible route is difficult to check and cannot show where self-correction should begin. Visible working can support partial credit under the applicable marking, but no fixed outcome should be promised.

Paper 3 and Paper 5: related, not interchangeable

Paper 3

• Laboratory
• Apparatus and materials
• Student-generated observations/data
• Direct practical execution

Shared experimental reasoning

Paper 5

• Written paper
• Planned apparatus/method
• Supplied or proposed data
• Analysis and evaluation

Paper 3: the student must generate trustworthy evidence

Paper 3 lasts two hours, carries 40 marks and normally contains two or three questions. Exact tasks vary. Broad competence matters more than one rehearsed recipe.

Before collecting data

Read the whole procedure; identify measurements, hazards, changing and controlled quantities; select suitable apparatus from what is provided; prepare a table where appropriate; consider instrument range and resolution; and organise the bench to reduce mix-ups. Follow the examination and supervisor’s safety requirements rather than independent instructions from an article.

While collecting data

Read at eye level where relevant, use precision consistent with the apparatus, record immediately, write neutral observations and retain compromised trials with a note. Units belong in headings rather than every data cell. Do not silently edit readings to produce a smoother pattern.

After collecting data

Inspect consistency, show specimen working, plot carefully, use the requested fit, calculate a gradient from a large triangle where appropriate and interpret it chemically. Limitations should be specific and linked to what occurred.

Read a scale consistently

An online lesson can prepare reasoning, recording and analysis. It cannot reproduce the sensory and manual learning of measuring, heating, titrating or observing real materials under proper supervision. Students need regular laboratory practice through their school or approved centre.

Write what happened before deciding what it means

An observation is visible, measurable or directly detected. An inference is the chemical interpretation supported by that result and the stated procedure. Cautious verbs matter because a single observation may not be unique without the full test context.

Observation first, inference second

Three tutor-created examples

Unhelpful wording	Observation	Possible inference
It is copper	A blue precipitate forms	May support Cu²⁺ in the stated test context
A gas is made	Effervescence occurs; the gas gives the stated positive test	The gas identity is supported by the test result
The reaction is exothermic	The measured temperature rises	Energy is transferred to the surroundings under these conditions

Presentation is part of the measurement

Tables

A strong table places the independent variable first, names quantities precisely, gives units in headings, uses precision consistent with the instrument, distinguishes raw and processed data and retains anomalous readings. Ambiguous headings such as “result” and reordered values destroy the audit trail.

Same data, different presentation

Before

Table with missing units and inconsistent precision

temp	result
20	48.2
30	35
40	28.47
50	result 22

After

Table with clear quantities and units

Temperature / °C	Time / s
20	48.1
30	35.0
40	28.5
50	22.0

Graphs, gradients and intercepts

Name each axis with quantity and unit. Choose a scale that uses the grid and is easy to interpolate. Plot small precise points, draw an appropriate fit instead of joining dots, keep anomalies visible and do not force the origin unless justified or instructed.

Use a large gradient triangle with points on the fitted line, not necessarily raw points. Write gradient = change in y / change in x with units. The chemical meaning depends on how the variables were defined.

Original graph: trend, anomaly and gradient triangle

Illustrative gradient = 0.040 ÷ 20 = 0.0020 s⁻¹ °C⁻¹. Its chemical meaning depends on how the variables are defined.

Show underlying data

Fictional dataset

Temperature / °C	Rate / s⁻¹
20	0.020
25	0.028
30	0.039
35	0.052
40	0.041
45	0.081
50	0.101

A graph audit asks: labels, units, scale, points, fit, gradient triangle and interpretation. Each item is observable and can therefore be retested.

Name the mechanism of error, not “human error”

Random variation scatters repeat readings unpredictably within the method. A systematic effect shifts measurements consistently in one direction. A method limitation means the design or apparatus cannot isolate or resolve the desired quantity sufficiently. These categories guide different responses.

Three problems that should not be conflated

Random variation

Points scatter around the reference value.

Systematic effect

Tight points are displaced from the reference.

Method limitation

Example: response saturation or insufficient range.

Evaluation should form a chain: specific limitation → effect or direction → feasible improvement.

Three-link evaluation chain

1. Specific limitation

   Heat transfers to the cup and surroundings.

2. Direction/effect

   Measured ΔT is smaller than ideal; |ΔH| is underestimated.

3. Feasible change

   Use a better-insulated calorimeter with a lid and record temperature systematically.

Human error → inaccurate → be more carefulNot specific enough

Heat transferred to the surroundings can reduce the measured temperature rise, so insulation and a lid address the mechanism. Visual endpoint judgement can create variation, so approach slowly, swirl consistently and repeat for concordant values. Gas lost before closure makes early volume unrecorded, so a safely closed arrangement before initiation may be required where the procedure permits. Repetition can characterise random variation; it does not remove a systematic bias.

For uncertainty, follow the task and syllabus reading convention. Distinguish absolute and percentage uncertainty. A fictional delivered volume of 25.00 cm³ from two readings each ±0.05 cm³ has an absolute reading contribution of ±0.10 cm³ and a percentage uncertainty of 0.40%. Do not extend one instrument rule to every apparatus.

Paper 5: design a testable investigation on paper

Paper 5 may use an unfamiliar context. A complete plan turns the question into a controlled and measurable study:

1. define the relationship;
2. choose an independent variable, useful range and levels;
3. operationally define the dependent measurement;
4. name each important control and how it is maintained;
5. specify apparatus, precision, range and setup;
6. give an ordered method a trained student could follow;
7. explain repeats, anomalies and data processing; and
8. identify specific hazards, controls and disposal in context.

Eight-part Paper 5 planning canvas

1. 1

   Aim

   What relationship is being tested?

   Weak phrase: Investigate the reaction.
2. 2

   Independent variable

   What changes, over what range and levels?

   Weak phrase: Change temperature.
3. 3

   Dependent variable

   What is measured and operationally defined?

   Weak phrase: Measure rate.
4. 4

   Control variables

   Which factor, controlled in what way?

   Weak phrase: Keep everything else the same.
5. 5

   Apparatus and setup

   What range or precision is needed?

   Weak phrase: Use suitable apparatus.
6. 6

   Method

   Can another trained student follow the order?

   Weak phrase: Do the experiment.
7. 7

   Repeats and processing

   How are repeats, anomalies and graphs handled?

   Weak phrase: Repeat for accuracy.
8. 8

   Safety and disposal

   Which hazard and which suitable control?

   Weak phrase: Be careful.

“Measure rate” is too vague until rate is connected to a continuous measurement or defined endpoint. “Keep temperature the same” is stronger as “use a thermostatically controlled water bath and allow each mixture to reach the selected temperature before mixing.” Do not memorise a universal paragraph; method depends on the materials and question.

Turn supplied data into a justified conclusion

Orient to variables, units and the expected relationship. Identify processing, calculate visibly, represent data, distinguish trend from noise and quantify where supported. Then state a conclusion at the strength permitted by the range and variation. Evaluate anomalies, precision and method, and link each improvement to a limitation.

Ask whether the pattern is larger than the variation, the range is wide enough, enough points distinguish a line from a curve, the anomaly explanation has evidence, and the conclusion answers the original relationship.

Calibrate the strength of a conclusion

1. Too vague

   y changes.

2. Matched to the data · Aim here

   Across 20–50°C, rate generally increases with temperature; the 40°C point departs from the trend and requires review.

3. Stronger than the evidence

   Temperature always causes rate to increase according to one exact law.

Represent mechanisms and analytical evidence precisely

For a mechanism, account for charges and lone pairs, begin and end curly arrows at the electron source and destination, show bonds made and broken, use the correct species and check atom and charge balance. For spectra, name the relevant feature, connect it to the structural claim, use important absences where justified and test the whole proposal against the formula and chemical behaviour.

Tutor-created practice: mechanism representation audit

Naming a compound from one non-unique signal is no stronger than naming an ion from one ambiguous observation. Analytical arguments become persuasive by combining independent evidence.

Do not record only the topic—record the cause

An error log needs the date and paper, question skill, topic, six-skill cause, original thinking, corrected principle, a dated next drill and a retest result. Copying a full model solution creates activity without diagnosis.

An error log records cause and retest

Two examples with different error causes

Date/paper	Question skill	Topic	Cause	Original thinking	Corrected principle	Next drill + date	Retest
12 Aug · P2	Calculation	Solutions	Retrieve	Forgot cm³ conversion	V must be dm³ with mol dm⁻³	4 unit drills · 14 Aug	3/4 independent
13 Aug · P4	Mechanism	Organic	Represent	Knew product; arrow began at atom	Arrow begins at electron pair/bond	3 fragments · 16 Aug	Not yet retested

Review weekly: which cause appeared most; which error has stopped recurring; which correction still depends on notes; and which skill now needs a mixed transfer question. A corrected answer is not yet secure until the student can reproduce the method later without prompting.

Timed papers are a stage of training, not the whole method

From isolated practice to simulation

1. 1

   Isolate

   Short sets, with notes while building the method

   Can perform with less support?
2. 2

   Connect

   Choose the method in mixed questions

   Can perform with less support?
3. 3

   Time

   Paper sections with personal checkpoints

   Can perform with less support?
4. 4

   Simulate + review

   Authorised paper, classify, correct and retest

In Isolate, short sets build one skill and notes may be available. In Connect, mixed questions require method selection. In Time, sections use realistic conditions and personal checkpoints. In Simulate + review, authorised complete papers are followed by classification, correction and scheduled retest.

Three adaptable weeks illustrate the balance. A foundation-repair week combines two concept/calculation sessions, one mixed set and a retest. A Paper 3 support week combines the school laboratory, pre-lab planning and data/graph review—the tutor does not replace the lab. Near the examination, use a timed section or paper, deep review and two short drills on the dominant cause.

What progress can look like before the grade changes

Parents can ask for the two most frequent causes, one before/after answer, timed completion evidence, a delayed retest, confirmation of laboratory practice and the next review date. Grades can fluctuate with paper difficulty and boundaries; these behaviours are more directly actionable.

Progress dashboard without grade prediction

Repeated error types

falling / stable / rising

Evidence/date

Independent completion

improving / inconsistent / not yet evidenced

Evidence/date

Timed completion

on track / needs work / not yet tested

Evidence/date

Practical access

confirmed / needs confirmation

Evidence/date

Current priorityNext review date

The dashboard deliberately contains no predicted grade or speedometer. “Improving” needs a dated example; “not yet evidenced” is a prompt to gather data, not a negative label.

How focused tuition should use the evidence

Evidence-led tutoring cycle

1. 1Inspect
2. 2Locate
3. 3Teach
4. 4Practise
5. 5Transfer
6. 6Retest
7. 7Update

I am less interested in whether an answer is simply marked wrong than in the first point where it became wrong. That may be a missing chemical idea, an unjustified assumption, a unit conversion, a vague observation or a conclusion stronger than the evidence. Once that point is visible, practice can be specific and progress can be checked.

For Paper 3, I can help students prepare the reasoning, calculations, recording and evaluation. The school or approved centre must provide supervised laboratory work and examination arrangements.

Bring the examination year and route, one recent applicable attempt, teacher feedback, the student’s working and corrections, current coverage, Paper 3 experience and the date of the next assessed work. An imperfect, unedited attempt is more useful than a recopied model answer. Arrange a 9701 skills review.

Frequently asked questions

Should I complete full past papers from the beginning?

Usually combine targeted skill work with sections, then use full authorised papers when the purpose is integration and timing. Timing an unstable method can rehearse rushed error.

How can I improve Paper 1 speed?

Identify whether time is lost to retrieval, calculations, rereading or indecision. Train that cause, practise a skip-and-return rule and set checkpoints from evidence rather than one universal seconds-per-question rule.

Is Paper 5 a practical examination?

It is a written paper for planning, analysis and evaluation. Experimental reasoning remains essential. Paper 3 is the hands-on examination.

Can online tuition replace Paper 3 laboratory practice?

No. It can complement the laboratory by preparing calculations, recording, graphs, observations and evaluation. Direct apparatus work must be supervised by the school or approved centre.

How should I write an experimental improvement?

Name a specific limitation, explain its effect or direction, then propose a feasible modification that addresses that mechanism. “Be more careful” is not specific enough.

Should an anomalous result be deleted?

Not silently. Retain it, investigate it and handle it according to the evidence and instructions. A guessed explanation is not evidence.

What is the fastest way to improve calculations?

Diagnose the failing step, use a visible routine, practise targeted variants and retest in mixed questions. There is no honest universal shortcut.

How often should I review my error log?

A brief weekly review plus scheduled retests is useful for many students. Adapt the frequency to the timetable and how quickly the same cause reappears.