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Daily Practice

GCSE Science

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12th January 1979

5 questions · GCSE · 584 questions in this band

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  1. 1
    Concentration, Yield and Atom Economy

    Give the formula for percentage yield.

  2. 2
    Chemical Changes

    State the pH value of a neutral solution.

  3. 3
    Reactivity, Acids and Salts

    Give the ionic equation for neutralisation.

  4. 4
    Electrolysis

    In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.

  5. 5
    Energy Changes

    Using the values in the previous question, calculate the overall energy change for the reaction.

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