Daily Practice

GCSE Science

16th August 1982

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
Why do companies prefer reactions with a high atom economy?
2
Chemical Changes
Calculate the number of moles of sodium hydroxide in 200 cm3 of a 0.500 mol/dm3 solution.
3
Reactivity, Acids and Salts
State what is observed when magnesium ribbon is added to copper sulfate solution.
4
Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
5
Energy Changes
Give one everyday example of an endothermic process.

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