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Group A—Continued Group B—Continued
5. Identify the following as combination, decomposition, 5. Identify the following as combination, decomposition,
replacement, or ion exchange reactions: replacement, or ion exchange reactions:
(a) NaCl(aq) + AgNO 3 (aq) → NaNO 3 (aq) + AgCl↓ (a) ZnCO 3 (s) → ZnO(s) + CO 2 ↑
(b) H 2 O(l) + CO 2 (g) → H 2 CO 3 (l) (b) 2 NaBr(aq) + Cl 2 (g) → 2 NaCl(aq) + Br 2 (g)
(c) 2 NaHCO 3 (s) → Na 2 CO 3 (s) + H 2 O(g) + CO 2 (g) (c) 2 Al(s) + 3 Cl 2 (g) → 2 AlCl 3 (s)
(d) 2 Na(s) + Cl 2 (g) → 2 NaCl(s) (d) Ca(OH) 2 (aq) + H 2 SO 4 (aq) → CaSO 4 (aq) + 2 H 2 O(l)
(e) Cu(s) + 2 AgNO 3 (aq) → Cu(NO 3 ) 2 (aq) + 2 Ag(s) (e) Pb(NO 3 ) 2 (aq) + H 2 S(g) → 2 HNO 3 (aq) + PbS↓
(f) CaO(s) + H 2 O(l) → Ca(OH) 2 (aq) (f) C(s) + ZnO(s) → Zn(s) + CO↑
6. Write complete, balanced equations for each of the following 6. Write complete, balanced equations for each of the following
reactions: reactions:
(a) C 5 H 12 (g) + O 2 (g) → (a) C 3 H 6 (g) + O 2 (g) →
(b) HCl(aq) + NaOH(aq) → (b) H 2 SO 4 (aq) + KOH(aq) →
(c) Al(s) + Fe 2 O 3 (s) → (c) C 6 H 12 O 6 (s) + O 2 (g) →
(d) Fe(s) + CuSO 4 (aq) → (d) Na 3 PO 4 (aq) + AgNO 3 (aq) →
(e) MgCl 2 (aq) + Fe(NO 3 ) 2 (aq) → (e) NaOH(aq) + Al(NO 3 ) 3 (aq) →
(f) C 6 H 10 O 5 (s) + O 2 (g) → (f) Mg(OH) 2 (aq) + H 3 PO 4 (aq) →
7. Write complete, balanced equations for each of the following 7. Write complete, balanced equations for each of the following
decomposition reactions. Include symbols for physical states, decomposition reactions. Include symbols for physical states,
heating, and others as needed: heating, and others as needed:
(a) Solid potassium chloride and oxygen gas are formed when (a) When solid zinc carbonate is heated, solid zinc oxide and
solid potassium chlorate is heated. carbon dioxide gas are formed.
(b) Upon electrolysis, molten bauxite (aluminum oxide) yields (b) Liquid hydrogen peroxide decomposes to liquid water and
solid aluminum metal and oxygen gas. oxygen gas.
(c) Upon heating, solid calcium carbonate yields solid calcium (c) Solid ammonium nitrite decomposes to liquid water and
oxide and carbon dioxide gas. nitrogen gas.
8. Write complete, balanced equations for each of the following 8. Write complete, balanced equations for each of the following
replacement reactions. If no reaction is predicted, write “no replacement reactions. If no reaction is predicted, write “no
reaction” as the product: reaction” as the product:
(a) Na(s) + H 2 O(l) → (a) Zn(s) + FeCl 2 (aq) →
(b) Au(s) + HCl(aq) → (b) Zn(s) + AlCl 3 (aq) →
(c) Al(s) + FeCl 3 (aq) → (c) Cu(s) + HgCl 2 (aq) →
(d) Zn(s) + CuCl 2 (aq) → (d) Al(s) + HCl(aq) →
9. Write complete, balanced equations for each of the following ion 9. Write complete, balanced equations for each of the following ion
exchange reactions. If no reaction is predicted, write “no exchange reactions. If no reaction is predicted, write “no
reaction” as the product: reaction” as the product:
(a) NaOH(aq) + HNO 3 (aq) → (a) Ca(OH) 2 (aq) + H 2 SO 4 (aq) →
(b) CaCl 2 (aq) + KNO 3 (aq) → (b) NaCl(aq) + AgNO 3 (aq) →
(c) Ba(NO 3 ) 2 (aq) + Na 3 PO 4 (aq) → (c) NH 4 NO 3 (aq) + Mg 3 (PO 4 ) 2 (aq) →
(d) KOH(aq) + ZnSO 4 (aq) → (d) Na 3 PO 4 (aq) + AgNO 3 (aq) →
10. The gas welding torch is fueled by two tanks, one containing 10. Iron(III) oxide, or hematite, is one mineral used as an iron ore.
acetylene (C 2 H 2 ) and the other pure oxygen (O 2 ). The very hot Other iron ores are magnetite (Fe 3 O 4 ) and siderite (FeCO 3 ).
flame of the torch is produced as acetylene burns, Assume that you have pure samples of all three ores that will be
2 C 2 H 2 + 5 O 2 → 4 CO 2 + 2 H 2 O reduced by reaction with carbon monoxide. Which of the three
ores will have the highest yield of metallic iron?
According to this equation, how many liters of oxygen are
required to burn 1 L of acetylene?

10-23 CHAPTER 10 Chemical Reactions 273