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 AgNO_{3 (aq)} --> 2 Ag_(s) + Mg(NO₃)_{2 (aq)}

   f) F_{2 (g)} + 2 NaCl_(aq) --> 2 NaF_(aq) + Cl_{2 (g)}

   g) 3 Pb(NO₃)_{2 (aq)} + 2 FeCl_{3 (aq)} --> 3 PbCl_{2 (s)} + 2 Fe(NO₃)_{3 (aq)}

   h) 4 Na_(s) + O_{2 (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) --> PbCO_{3 (s)}

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

5. 4 Al + 3 O₂ --> 2 Al₂O₃
   a)

   b)

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

   b)

   c)

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

   b)

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

   b)

9. 6 PbO + O₂ --> 2 Pb₃O₄
   a)

   b)
   

10. N₂ + 3 H₂ --> 2 NH₃
    a)

    b)

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

    b)

    c)

    * d)

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

    b)

    
    
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