Daily Practice

GCSE Science

25th November 1985

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
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
4
Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
5
Electrolysis
Concentrated sodium chloride solution (brine) is electrolysed using inert electrodes. State the products formed at the cathode and at the anode.

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