Daily Practice · GCSE Science

Daily Practice - GCSE Science

27th June 1997

5 questions · GCSE · 584 questions in this band

1
Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
2
Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
3
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.
4
Bond Energies, Cells and Fuel Cells
State whether breaking a chemical bond requires energy or releases energy.
5
Rate and Extent of Chemical Change
Explain, using collision theory, why increasing the concentration of a reactant in solution increases the rate of a reaction.

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