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Answer Key - Review: Reaction Types and Stoichiometry


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  1. Balance the following reactions. Identify each type.
    a) SR Fe2O3 + 2 Al --> Al2O3 + 2 Fe
    b) Combustion C7H16 + 11 O2 --> 7 CO2 + 8 H2O
    c) DR BaCl2 + Na2CrO4 --> BaCrO4 + 2 NaCl
    d) D 2 HgO --> 2 Hg + O2
    e) Combination C600H1000O500 + 50 H2O --> 50 C12H22O11 (large starch molecule converted to sugar)
    **f) D 4 C3H5(NO3)3 --> 12 CO2 + 10 H2O + 6 N2 + O2
  2. Know the symbols in table 7.1,p. 179.
  3. Complete and balance the following chemical reactions. If no reaction, say so.
    a) 3 NaBr + H3PO4 --> Na3PO4 + 3 HBr

    b) Pb(s) + Mg(NO3)2 (aq) --> No reaction.

    c) 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O

    d) 2 KCl --> 2 K + Cl2

    e) Mg(s) + 2 AgNO3 (aq) --> 2 Ag(s) + Mg(NO3)2 (aq)

    f) F2 (g) + 2 NaCl(aq) --> 2 NaF(aq) + Cl2 (g)

    g) 3 Pb(NO3)2 (aq) + 2 FeCl3 (aq) --> 3 PbCl2 (s) + 2 Fe(NO3)3 (aq)

    h) 4 Na(s) + O2 (g) --> 2 Na2O (s)

  4. Write the net ionic equation for the following reactions. Remember to balance the reactions.
    a) Pb+2(aq) + CO3-2(aq) --> PbCO3 (s)

    b) 2 Fe (s) + 3 Cu+2(aq) --> 3 Cu (s) + 2 Fe+3(aq)

  5. 4 Al + 3 O2 --> 2 Al2O3
    a) answer to #5a

    b) answer to #5b

  6. Magnesium reacts with hydrochloric acid (HCl) to produce magnesium chloride and hydrogen gas.
    a) Mg + 2 HCl --> MgCl2 + H2

    b) answer to #6b

    c) answer to #6c

  7. 4 NH3 + 5 O2 --> 4 NO + 6 H2O
    a) answer to #7a

    b) answer to #7b

  8. Fe3O4 + 4 CO --> 3 Fe + 4 CO2
    a) answer to #8a

    b) answer to #8b

  9. 6 PbO + O2 --> 2 Pb3O4
    a) answer to #9a

    b) answer to #9b

  10. N2 + 3 H2 --> 2 NH3
    a) answer to #10a

    b) answer to #10b

  11. C5H12 + 8 O2 --> 5 CO2 + 6 H2O
    pentane
    a) answer to #11a

    b) answer to #11b

    c) answer to #11c

    * d) answer to #11d

  12. * A solution containing 14.0 g of AgNO3 is added to a solution containing 4.83 g of CaCl2 .
    a) answer to #12a

    b) answer to #12b



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