20 4.4 Composition, Decomposition, and Combustion Reactions

Practice questions

    1. Is the following statement true or false? The following reaction is a composition reaction: [latex]\ce{NaCl + AgNO_{3} {\rightarrow} AgCl + NaNO_{3}}[/latex]
    2. Is the following statement true or false? The following reaction is a composition reaction: [latex]\ce{CaO + CO_{2} {\rightarrow} CaCO_{3}}[/latex]
    3. Is the following statement true or false? The following reaction is a decomposition reaction: [latex]\ce{HCl + NaOH {\rightarrow} NaCl + H_{2}O}[/latex]
    4. Is the following statement true or false? The following reaction is a decomposition reaction: [latex]\ce{CaCO_{3} {\rightarrow} CaO + CO_{2}}[/latex]
    5. Which of the following is a combustion reaction?
        1. [latex]\ce{6C + 3H_{2} {\rightarrow} C_{6}H_{6}}[/latex]
        2. [latex]\ce{H_{2}SO_{3} {\rightarrow} H_{2}O + SO_{2}}[/latex]
        3. [latex]\ce{C_{6}H_{12}O_{6} + 6CO_{2} {\rightarrow} 6CO_{2} + 6H_{2}O}[/latex]
        4. [latex]\ce{NaCl + AgNO_{3} {\rightarrow} AgCl + NaNO_{3}}[/latex]
    6. Which of the following is a combustion reaction?
        1. [latex]\ce{HCl + NaOH {\rightarrow} NaCl + H_{2}O}[/latex]
        2. [latex]\ce{2Fe_{2}S_{3} + 9O_{2} {\rightarrow} 2Fe_{2}O_{3} + 6SO_{2}}[/latex]
        3. [latex]\ce{CaCO_{3} {\rightarrow} CaO + CO_{2}}[/latex]
        4. [latex]\ce{CaO + CO_{2} {\rightarrow} CaCO_{3}}[/latex]
    7. Complete and balance the following combustion reactions.
        1. [latex]\ce{C_{4}H_{9}O_{4} + }[/latex] ……. [latex]\ce{O_{2} {\rightarrow}}[/latex] …… …….. [latex]\ce{+}[/latex] ……. ……..
        2. ….. [latex]\ce{CH_{3}NO_{2} +}[/latex] …….. [latex]\ce{O_{2} {\rightarrow}}[/latex] ……. [latex]\ce{CO_{2} +}[/latex] ….. ……. [latex]\ce{+2}[/latex] …….

       

      Answers

            1. False
            2. True
            3. False
            4. True
            5. c
            6. b
              1. [latex]\ce{C_{4}H_{9}O_{4} + }[/latex] [latex]\ce{6O_{2} {\rightarrow} 4CO_{2} + 5H_{2}O}[/latex]
              2. [latex]\ce{4CH_{3}NO_{2} +}[/latex] [latex]\ce{3O_{2} {\rightarrow}}[/latex] [latex]\ce{4CO_{2} + 6H_{2}O_{2} + 2N_{2}}[/latex]

         

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