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Daily Practice

GCSE Science

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23rd February 1988

5 questions · GCSE · 584 questions in this band

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  1. 1
    Moles, Formulae and Equations

    Why is the amount of product directly proportional to the amount of limiting reactant?

  2. 2
    Concentration, Yield and Atom Economy

    Give the formula for percentage yield.

  3. 3
    Chemical Changes

    A student reacts 2.4 g of magnesium with excess dilute hydrochloric acid: Mg + 2HCl -> MgCl2 + H2. Relative atomic mass of Mg = 24. Calculate the number of moles of hydrogen gas produced.

  4. 4
    Reactivity, Acids and Salts

    Give the ionic equation for neutralisation.

  5. 5
    Electrolysis

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

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