Chapter 3: Uncertainty, Significant Figures and Graphs

A-level ChemistryModule 1: Practical Skills7 topicsHigher

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Releases 1 August 2026

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Uncertainty, Significant Figures and Graphs: Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions15 marks38 min

standard / hard / synoptic

2 marksdefinestandardOCR A

Define or identify the key idea in core definition, then explain why it matters in Uncertainty, Significant Figures and Graphs.

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3 marksexplainstandardOCR A

Proof Academy original experimental data

Condition	Measurement 1	Measurement 2	Mean
A	12.4	12.8	12.6
B	18.1	17.7	17.9
C	24.6	24.2	24.4

Using the stimulus where appropriate, explain the pattern or process involving calculation in Uncertainty, Significant Figures and Graphs.

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4 marksanalysehardOCR A

Trend from an OCR-style practical

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Analyse how practical evidence affects the outcome in Uncertainty, Significant Figures and Graphs. Include any relevant calculation, condition, diagram feature, or limitation.

State the relevant principle for practical evidence.
Apply it to the data, diagram, or named example.
Give a justified conclusion.

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6 marksevaluatesynopticOCR A

Original clean exam diagram

reagent Aintermediateproduct

Evaluate the chemical reasoning and practical evidence for synoptic link in Uncertainty, Significant Figures and Graphs. Your answer should be coherent, use precise exam-board terminology, and consider both method and evidence.

State the relevant principle for synoptic link.
Apply it to the data, diagram, or named example.
Give a justified conclusion.

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2. Implementing Methods and PAG Technique

4. Evaluation and Practical Exam Technique

Key learning objectives

Understand the key principles behind Uncertainty, Significant Figures and Graphs.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.