Daily Practice · GCSE Science

Daily Practice - GCSE Science

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

17th December 2017

5 questions · GCSE · 584 questions in this band

1
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
2
Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
3
Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
4
Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
5
Exothermic and Endothermic Reactions
A student heats solid copper carbonate strongly in a test tube, and it breaks down into copper oxide and carbon dioxide. Heating must be continued throughout the reaction for it to keep going. State whether this thermal decomposition reaction is exothermic or endothermic, and explain your reasoning.

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