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Balancing equations

Quiz by Oak National Academy: GCSE Combined Science AQA Foundation

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6 questions
Show answers
  • Q1
    What elements are present in CaCO₃ and how many atoms are there of each?
    calcium (3), carbon (3) and oxygen (3)
    calcium (1), carbon (1) and oxygen (3)
    calcium (1) and cobalt (3)
    carbon (1), actinium (1) and oxygen (3)
    30s
  • Q2
    Match the substance names and symbol formulae.
    Users link answers
    Linking
    30s
  • Q3
    Match the substance to the correct state symbol.
    Users link answers
    Linking
    30s
  • Q4
    The chemical formula for magnesium oxide is MgO. In a chemical symbol equation, how would you amend this to provide twice as many Mg and O particles?
    2Mg₂O
    2MgO
    Mg₂O₂
    30s
  • Q5
    When 12.2 g of iron reacted with an unknown mass of sulfur, 20.6 g of a product was formed. What was the mass of the sulfur?
    8.4 g
    32.8 g
    12.2 g
    10.3 g
    6.1 g
    30s
  • Q6
    Which symbol equation is correct for when bromine displaces iodine from sodium iodide solution?
    Br₂ (g) + 2NaI (aq) → 2NaBr (aq) + I₂ (g)
    Br₂ (aq) + 2NaI (aq) → 2NaBr (aq) + I₂ (aq)
    Br (l) + NaI (aq) → NaBr (aq) + I (l)
    Br₂ (l) + NaI (aq) → NaBr (aq) + I₂ (l)
    30s

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