Daily Practice

GCSE Science

19th January 1970

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
State the name given to a reaction in which a substance loses electrons.
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
Explain, in terms of bonds, why breaking bonds is an endothermic process.

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