Daily Practice · GCSE Science

Daily Practice - GCSE Science

4th October 1993

5 questions · GCSE · 584 questions in this band

1
Moles, Formulae and Equations
How many atoms are there in 0.5 mol of helium?
2
Concentration, Yield and Atom Economy
Convert 250 cubic centimetres into cubic decimetres.
3
Chemical Changes
State the name given to a reaction in which a substance loses electrons.
4
Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
5
Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.

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