Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
20th June 2017
- 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 what is meant by the activation energy of a reaction.
- 4Bond Energies, Cells and Fuel Cells
State whether forming a new chemical bond requires energy or releases energy.
- 5Rate and Extent of Chemical Change
State the four factors that can increase the rate of a chemical reaction.
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