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Chemistry Grade 9-12

Science: Balancing Chemical Equations

Using coefficients to conserve atoms in reactions

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Using coefficients to conserve atoms in reactions

Chemistry - Grade 9-12

Instructions: Balance each chemical equation by adding whole-number coefficients. Do not change subscripts. Check that the number of each kind of atom is equal on both sides.
  1. 1
    Particle model showing hydrogen and oxygen molecules forming water.

    Balance the equation: H2 + O2 -> H2O

  2. 2
    Particle model showing nitrogen and hydrogen molecules forming ammonia.

    Balance the equation: N2 + H2 -> NH3

  3. 3
    Particle model showing sodium and chlorine forming sodium chloride.

    Balance the equation: Na + Cl2 -> NaCl

  4. 4
    Particle model showing magnesium and oxygen forming magnesium oxide.

    Balance the equation: Mg + O2 -> MgO

  5. 5
    Particle model showing aluminum and oxygen forming aluminum oxide.

    Balance the equation: Al + O2 -> Al2O3

  6. 6
    Particle model showing iron and oxygen forming iron oxide.

    Balance the equation: Fe + O2 -> Fe2O3

  7. 7
    Molecular model showing propane and oxygen producing carbon dioxide and water.

    Balance the equation: C3H8 + O2 -> CO2 + H2O

  8. 8
    Molecular model showing methane and oxygen producing carbon dioxide and water.

    Balance the equation: CH4 + O2 -> CO2 + H2O

  9. 9
    Particle model showing calcium and water forming calcium hydroxide and hydrogen gas.

    Balance the equation: Ca + H2O -> Ca(OH)2 + H2

  10. 10
    Particle model showing potassium chlorate decomposing into potassium chloride and oxygen.

    Balance the equation: KClO3 -> KCl + O2

  11. 11
    Particle model showing sodium hydroxide and sulfuric acid forming sodium sulfate and water.

    Balance the equation: NaOH + H2SO4 -> Na2SO4 + H2O

  12. 12
    Particle model showing silver nitrate and sodium chloride forming silver chloride and sodium nitrate.

    Balance the equation: AgNO3 + NaCl -> AgCl + NaNO3

  13. 13
    Particle model showing calcium carbonate decomposing into calcium oxide and carbon dioxide.

    Balance the equation: CaCO3 -> CaO + CO2

  14. 14
    Molecular model showing ammonia and oxygen producing nitric oxide and water.

    Balance the equation: NH3 + O2 -> NO + H2O

  15. 15
    Molecular model showing ethanol and oxygen producing carbon dioxide and water.

    Balance the equation: C2H5OH + O2 -> CO2 + H2O

LivePhysics™.com Chemistry - Grade 9-12

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