Atoms and molecules
2 marks · NormalState two differences between an atom and a molecule.
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1. An atom is a single particle; a molecule is made up of two or more atoms bonded together. 2. An atom represents a single element; a molecule can consist of the same or different elements.
Must show: Single vs more than one atom, Element identity vs possible mix
Common mistakes: Giving only one difference; Confusing molecules as always mixtures
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Marking points
B1 · 1 mark · Correct, clear difference 1 (e.g. single particle vs bonded atoms).
B1 · 1 mark · Correct, clear difference 2 (e.g. atom = one element; molecule = same or different elements possible).
Worked solution
1. An atom is a single particle, while a molecule contains two or more atoms joined together.
2. An atom represents one element; a molecule may have atoms of the same or different elements.