Daily Practice

GCSE Science

4th March 1975

5 questions · GCSE · 584 questions in this band

1
Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
2
Electrolysis
State the two materials commonly used as inert electrodes in electrolysis, and explain why they must be inert.
3
Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
4
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.
5
Bond Energies, Cells and Fuel Cells
State whether breaking a chemical bond requires energy or releases energy.

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