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K223 / K225 / 2027
G2 Combined Science Chemistry

Chemistry study notes

Qualitative Analysis

Identify hydrogen, oxygen and carbon dioxide with tests that tell them apart.

SEC G2 Science K223 / K225 (2027)

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2 topics

  1. Identify the gas, not just the bubbles

    A named gas needs a specific test and observation.

  2. Predict the gas, then prove it

    Link each gas to the reaction that makes it, and keep observations separate from conclusions.

Scope

Learning outcomes

6. Qualitative Analysis (K223 / K225). Use the outcome map to find the explanation for a particular syllabus requirement.

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  1. 6(a) Identify gases

    • Carbon dioxide with limewater
    • Hydrogen with a lighted splint
    • Oxygen with a glowing splint

    Identify the gas, not just the bubblesPredict the gas, then prove it