Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
30th March 2017
- 1Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
- 2Energy Changes
A reaction profile shows the reactants at 220 kJ and the products at 340 kJ. State whether the reaction is exothermic or endothermic.
- 3Exothermic and Endothermic Reactions
State the energy transfer that occurs during an endothermic reaction.
- 4Bond Energies, Cells and Fuel Cells
State the two substances that react inside a hydrogen fuel cell.
- 5Rate and Extent of Chemical Change
State what is meant by a catalyst.
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