Daily Practice

GCSE Science

3rd September 1978

5 questions · GCSE · 584 questions in this band

1
Chemical Changes
State the name given to a reaction in which a substance loses electrons.
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 aluminium oxide is dissolved in molten cryolite rather than melted on its own.
4
Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
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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