Simple differences between mixtures and compounds
2 marks · NormalState whether each of the following is an element, a compound, or a mixture: (a) Hydrogen chloride gas (b) Brass
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(a) Compound
(b) Mixture
Common mistakes: Calling brass a compound; Confusing hydrogen chloride with hydrogen or chlorine
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Marking points
B1 · 1 mark · Correctly identifies hydrogen chloride gas as a compound
B2 · 1 mark · Correctly identifies brass as a mixture
Worked solution
(a) Hydrogen chloride is a compound (it contains hydrogen and chlorine chemically joined).
(b) Brass is a mixture of copper and zinc metals.