Daily Practice

GCSE Science

25th October 1992

5 questions · GCSE · 584 questions in this band

1
Chemical Changes
Write the word equation for the reaction between zinc and hydrochloric acid.
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
State whether the combustion of methane is exothermic or endothermic.
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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