Daily Practice · GCSE Science

Daily Practice - GCSE Science

25th July 1998

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
2
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
3
Reactivity, Acids and Salts
Define oxidation in terms of electrons.
4
Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
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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