Daily Practice · GCSE Science

Daily Practice - GCSE Science

10th April 1996

5 questions · GCSE · 584 questions in this band

1
Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
2
Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
3
Energy Changes
Using the values in the previous question, calculate the overall energy change for the reaction.
4
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.
5
Bond Energies, Cells and Fuel Cells
State the only substance produced when a hydrogen fuel cell reacts pure hydrogen with pure oxygen.

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