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Daily Practice

GCSE Science

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5th March 1993

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

    Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.

  3. 3
    Reactivity, Acids and Salts

    Give the ionic equation for neutralisation.

  4. 4
    Electrolysis

    In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.

  5. 5
    Energy Changes

    A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.

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