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Chemistry (Edexcel Higher)
Calculations involving masses

Starter quiz

  • Which of the following is the correct chemical formula for calcium carbonate?
    • CACO3
    • CaCo₃
    • CaCO
    • CaCO₃  ✓
    • CaC
  • Match each keyword to the correct definition.
    • chemical equation
      ⇔
      describes a reaction, indicating the reactants and products ✓
    • chemical formula
      ⇔
      shows the number of atoms of each element in a substance ✓
    • coefficient
      ⇔
      number placed in front of a chemical formula to balance an equation ✓
    • subscript
      ⇔
      written slightly below and to the side of another character ✓
    • state symbol
      ⇔
      indicates the physical state of substances in a reaction ✓
  • Which chemical equation is correctly balanced?
    • Mg + Cl → MgCl
    • Mg + Cl₂ → MgCl
    • Mg + Cl₂ → MgCl₂  ✓
    • Mg + 2Cl → MgCl₂
  • Match each element to its correct relative atomic mass.
    • He
      ⇔
      4 ✓
    • Be
      ⇔
      9 ✓
    • F
      ⇔
      19 ✓
    • Ne
      ⇔
      20 ✓
    • B
      ⇔
      11 ✓
    • Na
      ⇔
      23 ✓
  • The relative formula mass of sodium sulfide, Na₂S is ______.
    • '78' ✓
  • The relative formula mass of Al(OH)₃ is ______.
    • '78' ✓
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