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Daily Practice

GCSE Science

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31st January 1971

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

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

  4. 4
    Reactivity, Acids and Salts

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

  5. 5
    Electrolysis

    State the name given to the negative electrode in electrolysis.

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