18 4.2 Writing and Balancing Chemical Equations

Practice questions

    1. What is the balanced chemical equation for the reaction between hydrogen and water to form [latex]\ce{HCl}[/latex]?
      1. [latex]\ce{H_{2} + Cl_{2} {\rightarrow} 2HCl}[/latex]
      2. [latex]\ce{2H_{2} + Cl_{2}{\rightarrow} 2HCl}[/latex]
      3. [latex]\ce{H_{2} + Cl_{2} {\rightarrow} 4HCl}[/latex]
      4. [latex]\ce{2H_{2} + 2Cl_{2} {\rightarrow} 2HCl}[/latex]
    2. Ethane, [latex]\ce{C_{2}H_{6}}[/latex] reacts with oxygen to make carbon dioxide and water. What is the balanced chemical equation for this reaction?
      1. [latex]\ce{4C_{2}H_{6} + 7O_{2} {\rightarrow} 4CO_{2} + 6H_{2}O}[/latex]
      2. [latex]\ce{2C_{2}H_{6} + 7O_{2} {\rightarrow} 4CO_{2} + 12H_{2}O}[/latex]
      3. [latex]\ce{2C_{2}H_{6} + 5O_{2} {\rightarrow} 4CO_{2} + 6H_{2}O}[/latex]
      4. [latex]\ce{2C_{2}H_{6} + 7O_{2} {\rightarrow} 2CO_{2} + 6H_{2}O}[/latex]
      5. [latex]\ce{2C_{2}H_{6} + 7O_{2} {\rightarrow} 4CO_{2} + 6H_{2}O}[/latex]
    3. Fill in the missing coefficient(s) to balance the equation: ………… [latex]\ce{NaHCO_{3} {\rightarrow} Na_{2}CO_{3} + CO_{2} + H_{2}O}[/latex]
    4. Balance the following equation by filling in the blanks: ……….. [latex]\ce{NaClO_{3} {\rightarrow}}[/latex] …………. [latex]\ce{NaCl + 3O_{2}}[/latex]
    5. Balance the following equation by filling in the blanks: ………. [latex]\ce{Al +}[/latex] …….. [latex]\ce{O_{2} {\rightarrow}}[/latex] ……… [latex]\ce{Al_{2}O_{3}}[/latex]
    6. Balance the following equation by filling in the blanks: [latex]\ce{H_{2}SO_{4} +}[/latex] ……… [latex]\ce{NaOH} {\rightarrow} \ce{Na_{2}SO_{4}} +[/latex] …….. [latex]\ce{H_{2}O}[/latex]
    7. Balance the following equation by filling in the blanks: [latex]\ce{Ca{(OH)_{2}} +}[/latex] ……… [latex]\ce{HCl} {\rightarrow} \ce{CaCl_{2}} +[/latex] ……… [latex]\ce{H_{2}O}[/latex]
    8. The balanced equation for the reaction between silver nitrate and magnesium chloride is:
      [latex]\ce{2AgNO_{3} + MgCl_{2} {\rightarrow} 2AgCl + Mg{(NO_{3})}_{2}}[/latex].
      Is the above statement true or false?
    9. What is the balanced chemical equation for the reaction between hydrochloric acid and calcium carbonate to form carbon dioxide, calcium chloride and water?
      1. [latex]\ce{2HCl + 2CaCO_{3} {\rightarrow} CaCl_{2} + CO_{2} + H_{2}O}[/latex]
      2. [latex]\ce{4HCl + CaCO_{3} {\rightarrow} CaCl_{2} + CO_{2} + 2H_{2}O}[/latex]
      3. [latex]\ce{HCl + 2CaCO_{3} {\rightarrow} 2CaCl_{2} + 2CO_{2} + H_{2}O}[/latex]
      4. [latex]\ce{2HCl + CaCO_{3} {\rightarrow} CaCl_{2} + CO_{2} + H_{2}O}[/latex]
    10. The balanced chemical equation for the reaction between ammonia gas and chlorine gas to form hydrazine is: [latex]\ce{4NH_{3} +Cl_{2} {\rightarrow} 2N_{2}H_{4} + 2NH_{4}Cl}[/latex]. Is this statement true or false?

Answers

    1. a
    2. e
    3. 2
    4. 2, 2
    5. 4, 3, 2
    6. 2, 2
    7. 2, 2
    8. True
    9. d
    10. True

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