Daily Practice · GCSE Science

Daily Practice - GCSE Science

Biology, chemistry and physics recall, definition and calculation, drawn from every strand.

22nd January 2021

5 questions · GCSE · 584 questions in this band

1
Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
2
Energy Changes
Using the values in the previous question, calculate the overall energy change for the reaction.
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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