Daily Practice · GCSE Science

Daily Practice - GCSE Science

21st December 1994

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
Give the formula for atom economy.
2
Chemical Changes
Write the word equation for the reaction between zinc and hydrochloric acid.
3
Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
4
Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
5
Energy Changes
State whether the combustion of methane is exothermic or endothermic.

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