Daily Practice

GCSE Science

11th October 1984

5 questions · GCSE · 584 questions in this band

1
Moles, Formulae and Equations
Calculate the number of moles in 88 g of carbon dioxide. (Mr = 44)
2
Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
3
Chemical Changes
Calculate the number of moles of sodium hydroxide in 200 cm3 of a 0.500 mol/dm3 solution.
4
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
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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