Grade 9 · CAPS

Grade 9 Compounds

Natural Sciences and Technology practice questions with answers

Grade 9 Compounds is part of the CAPS Natural Sciences and Technology curriculum, covering how elements combine in fixed ratios to form compounds, and how to name and recognise them from their chemical formulae. Learners practise naming compounds such as sodium chloride, calcium sulphate and calcium sulphite, identify which formulae represent a compound rather than an element, and work out which elements make up a given compound. The practice questions below are drawn from ReClass's own question bank, based on real Grade 9 CAPS assessments, giving learners a chance to work through compound-naming questions in the same style they will meet in a test.

Worked example

Give the scientific name for table salt.

Answer & explanation

Sodium chloride

You'll also practise

  • 4.1 Fill in the missing words
  • Hydrogen nitrate (HNO3) consists of which of the following elements?
  • Which one of the following is an example of a compound?
  • CuSO4 is the chemical formula for which compound?
  • Give the chemical name for the compound NaCl.
  • Give the chemical name for the compound CaSO4.
  • Give the chemical name for the compound CaSO3.
  • Give the correct term: a substance in which two or more atoms are chemically bonded in a fixed ratio.
  • Give the correct term: the salts of hydrochloric acid.
  • The correct chemical formula for sulphur trioxide, a compound formed when sulphur reacts fully with oxygen, is:
  • Sulphur reacts with oxygen to form sulphur dioxide. What TYPE of substance is sulphur dioxide, given that it is made when a non-metal reacts with oxygen?

Common mistakes

  • Confusing a compound with a mixture or an element.
  • Getting sulphate and sulphite the wrong way round when naming compounds.
  • Not reading a chemical formula's subscripts carefully when identifying the elements present.

Aligned to CAPS Grade 9 Natural Sciences and Technology — Compounds.

Check your own understanding

Start a personalised Grade 9 Compounds practice session on ReClass.

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