Daily Practice

GCSE Science

31st December 1988

5 questions · GCSE · 584 questions in this band

1
Chemical Changes
State the pH value of a neutral solution.
2
Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
3
Electrolysis
Aqueous copper sulfate solution is electrolysed using inert graphite electrodes. State the products formed at (a) the cathode and (b) the anode, giving a reason for each.
4
Energy Changes
Using the values in the previous question, calculate the overall energy change for the reaction.
5
Exothermic and Endothermic Reactions
Explain, in terms of the reaction pathway, why adding a catalyst increases the rate of a reaction without changing the overall energy change of the reaction.

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