Paper 5 Practical Test: The Complete Guide

Paper 5 is the only 0620 paper where marks are won with your hands as well as your pen, and it still loses more marks to writing than to technique. Forty marks, 75 minutes, 20% of the grade, and most of the paper is marked on how you record, process and explain, not on whether the experiment “worked”.

What Paper 5 actually assesses

Cambridge publishes the assessed skills, and they map onto four kinds of marks:

Manipulation marks. Doing the practical work: filling a burette without air gaps, swirling during a titration, heating safely, using a pipette filler. The supervisor’s report and your results’ closeness to the true values feed these.

Recording marks. Tables with headings and units, readings at the precision of the instrument, observations in proper language (colours, precipitates, effervescence, not conclusions).

Processing marks. Averaging concordant titres, calculating temperature changes, plotting graphs, reading values off them with construction lines.

Evaluation and planning marks. Identifying sources of error, suggesting improvements, and short “describe how you would…” plans.

Notice the weighting implication: a student with steady hands and sloppy tables fails this paper; a student with average technique and disciplined recording scores highly. The marks live on the page.

The experiment types that appear

Paper 5 recycles a stable set of experiments. Each paper typically pairs one quantitative task with one qualitative task.

Titration. Acid against alkali with an indicator. You record a rough titre and accurate titres in a printed table, identify concordant results (within 0.2 cm³), average them, and use the average in a calculation. Burette readings to 0.1 cm³, both initial and final, every run.

Rate of reaction. Timing a reaction at different concentrations or temperatures: gas collection, a disappearing cross, or mass loss. You tabulate times or volumes, plot the graph, and interpret it.

Energetics. Temperature changes for dissolving, displacement or neutralisation in a polystyrene cup. Read the thermometer to 0.5 °C, record initial and final temperatures, calculate the change with its direction, and explain heat-loss errors.

Salt preparation and separation. Making crystals from an acid and an insoluble base, filtration, evaporation to the crystallisation point. Marks for technique, order of steps and reasoning.

Qualitative analysis. An unknown solid or solution, a printed sequence of tests, and a table to complete with your observations, then conclusions naming the ions. The observation wording must match the official qualitative analysis notes, which we tabulate in full in the ion and gas tests guide.

All the underlying apparatus knowledge sits in the Experimental Techniques topic, and the same experiments appear on the written alternative. The Paper 6 guide covers that version.

Planning marks

One question usually ends with a short plan: “Describe how you could find out whether…” worth 3-4 marks. The marking grammar is identical to Paper 6: apparatus named, quantities stated, the variable you change, the variables you control, and repetition for reliability. Write numbered steps. A plan written as a paragraph hides its mark-worthy points; a plan written as steps displays them.

Accuracy marks: how your numbers are judged

This is the part of Paper 5 students misunderstand most. The supervisor performs the same experiment and reports the true values to Cambridge. Your titre is compared with the supervisor’s; marks are awarded in bands for closeness (schemes typically pay full accuracy marks within about 0.2-0.5 cm³ of the supervisor value, less further out).

Two consequences. First, technique matters: rinse the burette with the solution it will hold, remove the air gap below the tap, add dropwise near the end-point, read at eye level from the bottom of the meniscus. Second, never fake “nice” numbers. Your processing is marked on your own data: a real 23.85 cm³ honestly processed scores more than an invented 25.00.

Recording results properly

The habits that hold marks:

• Build the table before the readings. Columns for every reading you will take, headings with quantity and unit (Temperature / °C), no units inside the body.
• Record to instrument precision, consistently. Burette: two decimal places ending in 0 or 5 (24.30, 24.65). Thermometer: to 0.5 °C. Balance: to the precision displayed.
• Write observations at the moment you see them. “Light blue precipitate forms, insoluble in excess”: colour, state, behaviour. Memory edits observations into conclusions.
• Never erase raw data. Cross out with one line and rewrite. Examiners credit honest correction and distrust overwritten numbers.

Worked exam question

A standard Paper 5 processing sequence:

The student titrates 25.0 cm³ of aqueous sodium hydroxide with dilute hydrochloric acid. Her burette readings are shown. Rough: initial 0.00, final 26.50. Run 1: initial 0.00, final 25.90. Run 2: initial 25.90, final 51.70. (a) Complete the table to show the volume of acid used in each titration. [1] (b) Identify the concordant results and calculate the average volume of acid. [2]

Model answer with mark breakdown:

• (a) Rough 26.50 cm³; Run 1 25.90 cm³; Run 2 51.70 − 25.90 = 25.80 cm³ [1: all three titres correct, including the subtraction]
• (b) Runs 1 and 2 are concordant (25.90 and 25.80 are within 0.2 cm³); the rough is excluded [1]. Average = (25.90 + 25.80) ÷ 2 = 25.85 cm³ [1: with unit and two decimal places]

The trap is built into Run 2: the burette was not refilled, so the titre is a subtraction, not the final reading. Students who write 51.70 lose (a) and contaminate (b). Reading the table is the skill being examined.

The mistakes that cost marks

• Final readings recorded as titres. Always subtract initial from final; the burette is not always refilled between runs.
• One burette decimal place too few. “25.9” where the scheme demands “25.90”. The precision is part of the mark.
• Averaging in the rough titre. The rough exists to locate the end-point, not to count.
• Conclusions written as observations. “Carbon dioxide is given off” under “record your observations” scores zero; “effervescence; the gas turns limewater milky” scores.
• Leaving the graph for last. The graph carries 3-4 marks and is the first casualty of poor time management. Plot it as soon as the data exists.

How to phrase it for full marks

Student language: “My result was a bit off because of human error.” Mark-scheme language: “Heat was lost to the surroundings, so the measured temperature rise is lower than the true value; using a lid would reduce the error.”

Student language: “I did it three times to be accurate.” Mark-scheme language: “Repeated until two concordant titres within 0.2 cm³ were obtained, and only these were averaged, improving reliability.”

“Human error” earns nothing on any 0620 scheme: it names no cause and no fix. Every error answer should name the physical cause, the direction of the effect on the result, and the specific improvement.

How we prepare students for Paper 5 remotely

A fair question: how does online tutoring prepare a bench exam? By targeting where the marks actually are. Over half of Paper 5’s marks (recording, processing, graphs, planning, evaluation) are pen-and-paper skills, trained with real past papers and the published supervisor data. We rehearse the titration table until the subtraction trap can’t work, drill observation language against the official notes, and mark graphs to Cambridge’s four-point standard. For the manipulation itself, we prepare students to extract full value from their school’s practice practicals: what to watch, what to ask, which habits to lock in. Whether your school sits Paper 5 or Paper 6 (check the full picture in the 0620 exam format guide), the first session of the free 1-hour trial can run this exact diagnostic on a real practical past paper. No forms. WhatsApp us. We reply the same day.

The Malaysia note

Few Malaysian schools enter candidates for Paper 5. Most choose Paper 6, because Paper 5 demands provisioned labs, trained supervisors and Cambridge-compliant exam conditions. If your school is one of the exceptions (typically the larger international schools with full Cambridge science facilities), treat the school’s mock practical as the only full rehearsal you will get, and arrive with the recording and processing habits already automatic. For everyone else, this page is still worth the read: the skills Paper 5 assesses at the bench are the same skills Paper 6 assesses on paper, and the May/June series examines them either way.