Starter quiz

  • Which of these is true about elements?
    • They can have variable boiling points
    • They are organised in the Periodic Table  ✓
    • They are always compounds
    • They don't react with other elements
  • A metal sulfate contains the group of elements -SO₄, nitrates have the group -NO₃ and ______ have the group -CO₃.
    • 'carbonates' ✓
  • What elements are present in the calcium chloride?
    • 'calcium and chlorine' ✓
  • What of the following is an example of a molecular element?
    • Si
    • O₂  ✓
    • Na
  • Match the reacting elements with the compound formed.
    • copper + oxygen
      ⇔
      copper oxide ✓
    • copper + sulfur + oxygen
      ⇔
      copper sulfate ✓
    • potassium + bromine
      ⇔
      potassium bromide ✓
    • potassium + bromine + oxygen
      ⇔
      potassium bromate ✓
    • zinc + carbon
      ⇔
      zinc carbide ✓
    • zinc + carbon + oxygen
      ⇔
      zinc carbonate ✓
  • What indicates a compound in a chemical formula?
    • Presence of a single element
    • No subscripts (little numbers)
    • Multiple different elemental symbols  ✓
    • Only gases
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