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Topics Tested in Past O-Level Chemistry Paper 3 Practical Exam

Posted on by mibs 729
  1. Titration, e.g. acid-base titration (with suitable indicators such as methyl orange, screened methyl orange, and thymolphthalein). Other types of titrations may also be required, and where appropriate, sufficient working details will be given. [2025 & 2019 (thermometric), 2024, 2020 & 2014 (acid-base), 2021 & 2016 (redox-iodine), 2018 (redox-KMnO4), 2017 (acid-carbonate)]
  2. Speeds of reaction that may involve measuring of quantities, e.g. temperature, volume, length, mass or time measurements (2024-gas collection, 2023-Na2S2O3, 2022p, 2020, 2015)
  3. Experiments involving separation techniques such as simple paper chromatography, filtration and distillation (2024p-distillation)
  4. Salt preparation (not tested in the last 10 years)
  5. Gas collection, but no drying of gases (2020p)
  6. Thermal decomposition (2025, 2022, 2019)
  7. Enthalpy change (2022, 2021, 2018)
  8. Percentage mass (2023, 2019, 2017p, 2018p, 2014p)
  9. Organic chemistry (2023p)
  10. Qualitative inorganic analysis involving an element, a compound or a mixture, including displacement reactions and tests for oxidising and reducing agents. Candidates should be familiar with the reactions of cations, reactions of anions and tests for gases as detailed in the Notes for Qualitative Analysis. Candidates would not be required to carry out tests involving sulfur dioxide gas.
    Reactions involving ions not included in the Notes for Qualitative Analysis may be tested: in such cases, candidates will not be expected to identify the ions but only to draw conclusions of a general nature.
    Candidates should not attempt tests, other than those specified, on substances, except when it is appropriate to test for a gas. (tested almost every year, except for 2018)
  11. Qualitative organic analysis requiring a knowledge of simple organic reactions as outlined in Topic 11 Organic Chemistry, e.g. test-tube reactions indicating the presence of unsaturation (C=C) may be set, but this would be for the testing of observation skills and drawing general conclusions only (not tested in the last 10 years)

So what topics are most likely to be tested THIS YEAR?

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