Daily Practice

GCSE Science

11th October 1973

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
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
4
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
5
Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.

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