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Chemistry · Grades 9–12

Classifying chemical reactions

Study guide for Grades 9 to 12: 2 worked examples and 2 practice questions. Compare the number and kind of reactants and products, then match the pattern.

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Rule and key idea

Compare the number and kind of reactants and products, then match the pattern.

A + B → AB · AB → A + B · A + BC → AC + B · AB + CD → AD + CB · fuel + O₂ → CO₂ + H₂O

Worked examples

Classify this reaction: C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

Combustion: a fuel containing carbon and hydrogen reacts with oxygen to form carbon dioxide and water.

combustion

Classify this reaction: BaCl₂ + Na₂SO₄ → BaSO₄ + 2 NaCl

Double displacement: two compounds exchange partners (AB + CD → AD + CB).

double displacement

Try two questions

  1. Classify this reaction: Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag

    1. single displacement
    2. double displacement
    3. combustion
    4. synthesis

  2. Classify this reaction: HCl + NaOH → NaCl + H₂O

    1. double displacement
    2. synthesis
    3. single displacement
    4. decomposition

Answers and reasoning

Answers and marking notes
  1. single displacement

    Single displacement: an element replaces another element in a compound (A + BC → AC + B).

  2. double displacement

    Double displacement: two compounds exchange partners (AB + CD → AD + CB).

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