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Pure Chemistry

Chemistry study notes

Data and Experimental Skills

Read unfamiliar evidence, make useful measurements and explain what a result can support.

O-Level 6092 (2026) / SEC G3 K324 (2027)

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Choose a topic

8 topics

  1. Read unfamiliar data

    Select evidence and connect it to a chemical principle.

  2. Graphs and calculations

    Turn numbers into a trend, gradient or justified result.

  3. Evaluate evidence

    Explain limitations and target improvements.

  4. Measurements and recording

    Keep raw readings, temperature changes and observations interpretable.

  5. Titration and quantitative analysis

    Make the measured volume correspond to the reacting amount.

  6. Plan an investigation

    Specify a fair comparison and how it will answer the question.

  7. Reason from qualitative tests

    Keep the observation separate from the inferred identity.

  8. Separation and recovery

    Choose what to retain and how to recover it.

Scope and references

Learning outcomes and sources

Practical assessment: planning, measurement, presentation and evaluation. Use the outcome map to find the explanation for a particular syllabus requirement.

These labels map assessment skills and practical techniques, separately from the numbered theory outcomes. P, MMO, PDO and ACE are practical skill areas; T labels follow the listed techniques, and B labels follow H1 Assessment Objective B.

See the learning outcome map

  1. P Plan an investigation that answers a defined question

    • Define the question and key variables
    • Give a logical procedure and appropriate controls
    • Specify how data will lead to a conclusion
    • Identify relevant risks and explain suitable precautions

    Plan a comparison that can answer the question

  2. MMO Use apparatus and make detailed measurements and observations

    • Choose and use suitable apparatus and techniques
    • Follow arrangements and instructions correctly
    • Record observations and raw readings with justified precision
    • Make measurement decisions and investigate anomalies

    Record measurements that another person can interpretMake a titre correspond to the reacting amountsReason from an unknown test without guessingEvaluate evidence and explain the direction of an error

  3. PDO Present data in an appropriate, useful form

    • Tables, axes and units
    • Manipulate measurements for analysis and trends
    • Appropriate decimal places and significant figures

    Record measurements that another person can interpretTurn measurements into a graph or calculation

  4. ACE Analyse, conclude and evaluate

    • Interpret observations and numerical data
    • Use chemical principles to justify conclusions and predictions
    • Identify significant errors and limitations and trace their effects
    • Explain targeted improvements

    Read unfamiliar data with a purposeTurn measurements into a graph or calculationEvaluate evidence and explain the direction of an errorReason from an unknown test without guessing

  5. T1 Titration

    • Acid-base titration with an appropriate indicator
    • Use supplied instructions for other titration types
    • Burette recording and sufficient agreeing titres

    Make a titre correspond to the reacting amountsRecord measurements that another person can interpret

  6. T2 Measure reaction rates

    • Use a suitable change in volume, time, temperature, mass or another supplied signal
    • Process rate measurements and plan controlled comparisons
    • Appropriate data-logger use

    Turn measurements into a graph or calculationPlan a comparison that can answer the questionMeasure temperature changes and changes in mass

  7. T3 Use separation techniques

    • Paper chromatography, filtration and distillation
    • Interpret Rf values and separation evidence

    Recover the substance you need

  8. T4 Prepare salts

    • Choose soluble-salt, precipitation or titration route
    • Recover, wash and dry an appropriate product

    Recover the substance you need

  9. T5 Collect gases appropriately

    • Match collection measurement to the investigation
    • Avoid gas loss and account for temperature/pressure
    • Gas drying is not a required hands-on examination operation

    Plan a comparison that can answer the questionEvaluate evidence and explain the direction of an error

  10. T6 Qualitative inorganic analysis

    • Use cation, anion and gas evidence
    • Record precipitates, colour changes and reaction sequence
    • Interpret unfamiliar reactions generally rather than inventing identities
    • Use specified tests; sulfur dioxide practical tests are excluded

    Reason from an unknown test without guessing

  11. T7 Qualitative organic observations

    • Interpret simple organic test observations such as bromine-water decolourisation
    • Distinguish observation from a supported general conclusion

    Reason from an unknown test without guessing