Grade 8 Natural Sciences (NS) Summaries - Term 2 (Via Afrika): These summaries are compiled using the Via Afrika textbook's Term 2 content. The summaries are in English, with additional notes provided by the compiler.
Strand 2: Matter and materials
Topic 1: Atoms
Topic 2: Particle model ...
, Mixtures of elements and compounds
Elements (cont.)
Elements and compounds are
Atoms can form molecules
often mixed together
of compounds
• Air is a mixture of elements (nitrogen and
oxygen) and compounds (water vapour and • Different atoms can join to form molecules -
sulphur dioxide). molecules of compounds.
•
• These substances are mixtures - they aren't T1: Atoms
chemically bonded and their amounts can vary.
• (B)
Compounds
•
Different methods are used to
Compounds consist of
•
Sample
separate mixtures and compounds
Mixtures are separated through physical
methods - hand separation, separation using
magnets, sieving, decanting, filtration and
distillation.
Compounds are formed by
chemical reactions
atoms of different elements
•
•
When 2 or more different atoms bonded in
a fixed ratio, molecules of compounds form.
Molecules of compounds can break down
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