Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
30th January 2012
- 1Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
- 2Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
- 3Exothermic and Endothermic Reactions
State the energy transfer that occurs during an exothermic reaction.
- 4Bond Energies, Cells and Fuel Cells
State one factor that affects the size of the voltage produced by a chemical cell.
- 5Rate and Extent of Chemical Change
State two units that the rate of a reaction can be measured in.
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