Simple differences between mixtures and compounds
2 marks · NormalState whether each of the following substances is an element, a compound, or a mixture. (a) Silver (b) Seawater
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(a) element
(b) mixture
Common mistakes: Calling seawater a compound; Confusing element/compound
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Marking points
B1 · 1 mark · Correctly identifies silver as an element
B2 · 1 mark · Correctly identifies seawater as a mixture
Worked solution
(a) Silver is an element as it contains only one type of atom.
(b) Seawater is a mixture because it contains water, salts, and other dissolved substances, not chemically bonded.