Daily Practice

GCSE Science

25th December 1982

5 questions · GCSE · 584 questions in this band

1
Moles, Formulae and Equations
In the equation 2H2 + O2 gives 2H2O, how many moles of water are formed from 3 mol of hydrogen?
2
Concentration, Yield and Atom Economy
Calculate the concentration in moles per cubic decimetre of a solution containing 0.5 mol in 250 cubic centimetres.
3
Chemical Changes
State the name given to a reaction in which a substance loses electrons.
4
Reactivity, Acids and Salts
Name the salt made from zinc oxide and nitric 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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