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Physical Science, 5/e
Bill Tillery, Arizona State University
Chemical Formulas and Equations

Exercises

  1. Identify the following as empirical formulas or molecular formulas and indicate any uncertainty with (?):
    (a) CMgCl2Answer
    (b) C2H2Answer
    (c) BaF2Answer
    (d) C8H18Answer
    (e) CH4Answer
    (f) S8Answer
  2. What is the formula weight for each of the following compounds?
    (a)Copper(II) sulfateAnswer
    (b)Carbon disulfideAnswer
    (c)Calcium sulfateAnswer
    (d)Sodium carbonateAnswer
  3. What is the mass percentage composition of the elements in the following compounds?
    (a)Fool's gold, FeS2Answer
    (b)Boric acid, H3BO3Answer
    (c)Baking soda, NaHCO3Answer
    (d)Aspirin, C9H8O4Answer
  4. Write balanced chemical equations for each of the following unbalanced reactions:Answer
    (a) SO2 + O2→ SO3
    (b) P + O2→ P2O5
    (c) Al + HCl → AlCl3 + H2
    (d) NaOH + H2SO4→ Na2SO4 + H2O
    (e) Fe2O3 + CO → Fe + CO2
    (f) Mg(OH)2 + H3PO4→ Mg3(PO4)2 + H2O
  5. Identify the following as combination, decomposition, replacement, or ion exchange reactions:Answer
    (a)NaCl(aq) + AgNO3(aq)→ NaNO3(aq) + AgCl↓
    (b)H2O(l) + CO2(g)→ H2CO3(l)
    (c)2 NaHCO3(s)→ Na2CO3(s) + H2O(g) + CO2(g)
    (d)2 Na(s) + Cl2(g)→ 2 NaCl(s)
    (e)Cu(s) + 2 AgNO3(aq)→ Cu(NO3)2(aq) + 2 Ag(s)
    (f)CaO(s) + H2O(l)→ Ca(OH)2(aq)
  6. Write complete, balanced equations for each of the following reactions:Answer
    (a) C5H12(g) + O2(g)→
    (b) HCl(aq) + NaOH(aq)→
    (c) Al(s) + Fe2O3(s)→
    (d) Fe(s) + CuSO4(aq)→
    (e) MgCl(aq) + Fe(NO3)2(aq)→
    (f) C6H10O5(s) + O2(g)→
  7. Write complete, balanced equations for each of the following decomposition reactions. Include symbols for physical states, heating, and others as needed:
    (a)Solid potassium chloride and oxygen gas are formed when solid potassium chlorate is heated.
    (b)Upon electrolysis, molten bauxite (aluminum oxide) yields solid aluminum metal and oxygen gas.
    (c)Upon heating, solid calcium carbonate yields solid calcium oxide and carbon dioxide gas.Answer
  8. Write complete, balanced equations for each of the following replacement reactions. If no reaction is predicted, write "no reaction" as the product:Answer
    (a) Na(s) + H2O(l)→
    (b) Au(s) + HCl(aq)→
    (c) Al(s) + FeCl3(aq)→
    (d) Zn(s) + CuCl2(aq)→
  9. Write complete, balanced equations for each of the following ion exchange reactions. If no reaction is predicted, write "no reaction" as the product:Answer
    (a) NaOH(aq) + HNO3(aq)→
    (b) CaCl2(aq) + KNO3(aq)→
    (c) Ba(NO3)2(aq) + Na3PO4(aq)→
    (d) KOH(aq) + ZnSO4(aq)→
  10. The gas welding torch is fueled by two tanks, one containing acetylene (C2H2) and the other pure oxygen (O2). The very hot flame of the torch is produced as acetylene burns,
    2 C2H2(g) + O2(g)→ 4 CO2(g) + H2O(g)
    According to this equation, how many liters of oxygen are required to burn 1 liter of acetyleneAnswer?








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