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K223 / K225 / 2027
G2 Combined Science Chemistry

Chemistry study notes

Data and Experimental Skills

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

SEC G2 Science K223 / K225 (2027)

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7 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. Reason from qualitative tests

    Keep the observation separate from the inferred identity.

  7. Separation and recovery

    Choose what to retain and how to recover it.

Scope

Learning outcomes

Assessment Objective C: experimental skills in the theory papers. 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. C1 Select and use techniques, apparatus and materials

    • Choose apparatus for measuring, separating and testing
    • Acid/alkali titration with pipette, burette and indicator
    • Separation by crystallisation, filtration, chromatography and distillation

    Record measurements that another person can interpretMake a titre correspond to the reacting amountsRecover the substance you need

  2. C2 Take readings and record observations

    • Read scales, burettes and thermometers
    • Units in table headings
    • Record colours, precipitates and gas tests

    Record measurements that another person can interpretReason from an unknown test without guessing

  3. C3 Interpret and evaluate data and observations

    • Read tables and plot graphs
    • Gradient, intercept or intersection
    • Separate observation from conclusion

    Read unfamiliar data with a purposeTurn measurements into a graph or calculationReason from an unknown test without guessing

  4. C4 Evaluate methods and suggest improvements

    • Identify sources of error
    • Suggest a needed modification
    • Comment on safety

    Evaluate evidence and explain the direction of an error