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Daily Practice

GCSE Science

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31st January 1982

5 questions · GCSE · 584 questions in this band

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  1. 1
    Moles, Formulae and Equations

    Calculate the mass of 0.25 mol of sodium hydroxide, NaOH. (Na = 23, O = 16, H = 1)

  2. 2
    Concentration, Yield and Atom Economy

    Give the formula for 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

    Why is aluminium extracted by electrolysis rather than by reduction with carbon?

  5. 5
    Electrolysis

    Molten zinc chloride, ZnCl2, is electrolysed using inert electrodes. Write the half equation for the reaction at (a) the cathode, and (b) the anode.

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