Lesson 4.3.1.4

4.3.1.4 Chemical measurements Quiz: AQA Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.3.1.4, Chemical measurements: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 3: Quantitative chemistry, written with Revision Ninja.

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The 20 questions

  1. What is always present whenever any physical measurement is made?

    • Uncertainty
    • Zero error
    • An anomaly
    • Exact precision

  2. How can measurement uncertainty be estimated from repeated readings?

    • Total sum
    • Absolute zero
    • The median value
    • Range about mean

  3. Readings are 12.1, 12.3, 12.0 and 12.2 cm. What is the mean?

    • 12.0
    • 13.0
    • 12.15
    • 12.3

  4. Using the readings 12.1, 12.3, 12.0 and 12.2 cm, what is the range?

    • 0.3
    • 0.6
    • 0.15
    • 0.1

  5. Readings are 20, 22 and 24. What is the uncertainty expressed as range about the mean?

    • Plus or minus 4
    • Plus or minus 1
    • Plus or minus 2
    • Plus or minus 0

  6. Results are 5.1, 5.3 and 5.2. What is the uncertainty as range about the mean?

    • Plus or minus 0.0
    • Plus or minus 0.3
    • Plus or minus 0.2
    • Plus or minus 0.1

  7. Which chart type represents the distribution of repeated experimental results?

    • Line graph
    • Pie chart
    • Frequency diagram
    • Scatter plot

  8. What does a very large spread in a set of repeated results indicate?

    • No random errors
    • Perfect accuracy
    • High precision
    • Greater uncertainty

  9. Why is calculating a mean useful when taking repeated readings?

    • Removes systematic error
    • Eliminates uncertainty
    • Reduces single errors
    • Doubles precision

  10. Five balances record 10.2, 10.4, 10.1, 10.3 and 10.5 g. What is the range?

    • 0.3 g
    • 10.3 g
    • 0.4 g
    • 0.2 g

  11. Results are 3.0, 3.2 and 2.8. Which best describes the uncertainty?

    • Plus or minus 0.2
    • Plus or minus 0.4
    • Plus or minus 0.1
    • Plus or minus 0.0

  12. What does a tight cluster of results around the mean indicate?

    • High uncertainty
    • High precision
    • Systematic error
    • Low accuracy

  13. Why should experimental measurements be repeated?

    • To speed reaction
    • To heat substance
    • To estimate uncertainty
    • To increase volume

  14. A result is 25.0 with an uncertainty of plus or minus 0.5. What is the likely range?

    • 24.5 to 25.5
    • 25.0 to 25.5
    • 24.5 to 26.5
    • 24.0 to 26.0

  15. Repeat readings range from 1.20 to 1.30. What is the best estimate of uncertainty?

    • Plus or minus 0.05
    • Plus or minus 0.10
    • Plus or minus 0.25
    • Plus or minus 0.01

  16. Which set of readings is most precise?

    • 8.0, 10.0, 12.0
    • 9.0, 10.0, 11.0
    • 5.0, 10.0, 15.0
    • 10.0, 10.0, 10.1

  17. What term describes how repeated measurement results spread about a central value?

    • Concentration
    • Distribution
    • Anomalous
    • Yield

  18. Crystal masses of 4.52, 4.48 and 4.50 g are measured. What is the mean and uncertainty?

    • 4.48 plus or minus 0.04 g
    • 4.50 plus or minus 0.04 g
    • 4.50 plus or minus 0.02 g
    • 4.52 plus or minus 0.02 g

  19. Why can a single measurement not be used to find uncertainty?

    • Always exact
    • No spread exists
    • Zero error
    • Too large

  20. Burette titres of 22.10, 22.30 and 22.20 cm3 give what range about the mean?

    • Plus minus 0.20 cm3
    • Plus minus 0.10 cm3
    • Plus minus 0.30 cm3
    • Plus minus 0.05 cm3

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