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Balanced equations and reacting massesEdexcel International A Level Chemistry: Mind map

What this mind map covers

  • Balanced equations
  • Ionic equations
  • Reacting masses
  • Observations
  • Key examples

Exam questions on Balanced equations and reacting masses

  1. A student places granules of zinc in blue copper(II) sulfate solution, CuSO₄(aq), and watches the reaction over several minutes.
    Explain why this reaction occurs, and identify the spectator ion.2 marks
  2. A student adds magnesium carbonate in small portions to 50.0 cm³ of hydrochloric acid of concentration 1.00 mol dm⁻³ until no more solid dissolves. Relative atomic masses: C = 12.0, O = 16.0, Mg = 24.3.
    Calculate the maximum mass of magnesium carbonate that can react with the acid.2 marks
  3. A teacher demonstrates a precipitation reaction by mixing 25.0 cm³ of 0.100 mol dm⁻³ lead(II) nitrate solution, Pb(NO₃)₂(aq), with an excess of potassium iodide solution, KI(aq). Relative atomic masses: I = 126.9, Pb = 207.2.
    Write the full equation, with state symbols, and the ionic equation, with state symbols, for the reaction, and state what is observed.3 marks
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Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).