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Daily Practice

GCSE Science

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2nd March 1990

5 questions · GCSE · 584 questions in this band

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  1. 1
    Moles, Formulae and Equations

    Define the limiting reactant.

  2. 2
    Concentration, Yield and Atom Economy

    Why do companies prefer reactions with a high atom economy?

  3. 3
    Chemical Changes

    Calculate the number of moles of sodium hydroxide in 200 cm3 of a 0.500 mol/dm3 solution.

  4. 4
    Reactivity, Acids and Salts

    State what is observed when magnesium ribbon is added to copper sulfate solution.

  5. 5
    Electrolysis

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

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