Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
28th July 2012
- 1Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
- 2Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
- 3Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
- 4Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
- 5Exothermic 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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