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CHEM 1110 -- General Chemistry I
Chapter 3 and 4 Practice Problems

 

Balance the following reactions:

a)         ____ C2H5OH (l) + ____O2(g)  →  ____CO2(g) + ____H2O(g)

 b)            ____Fe(s) + ____O2(g)  →  ____Fe2O3(s)

c)            ____Na2SO4(aq) + ____MgBr2(aq)  →  ____NaBr(aq) + ____MgSO4(s)

d)            ____P4O10(s) + ____H2O(l)  →  ____H3PO4 (aq)

e)            ____Mg(s) + ____SiO2(s)  →  ____MgO(s) + ____Si(s)

f)            ____MnO2(s) + ____HCl(aq)  →  ____MnCl2(aq) + ____Cl2(g) + ____H2O(l)

g)            ____KCl(aq) + ____Pb(NO3)2 (aq)  →  ____KNO3(aq) + ____PbCl2(s)

Predict the products of the following reactions and write the net ionic equations if a reaction occurs (remember to balance):

h)                  Ca(NO3)2(aq) + H2SO4(aq)  →  

i)                  solutions of calcium bromide and sodium phosphate are mixed

j)         (NH4)2SO4(aq) + Pb(NO3)2(aq)  →

k)                  sodium sulfide and calcium chloride are dissolved in water

l)                  H2SO4(aq) + Al(OH)3(s)  →

m)      nickel(II) sulfate solution is mixed with lithium hydroxide solution

Which of the above reactions (a – m) are redox reactions?

Which are combustion reactions?

Which are precipitation reactions?

Which are acid-base reactions?

 

1) Acrylic acid, used in plastics, has the composition 50.0% C, 5.6% H, and 44.4% O.  What is the empirical formula of acrylic acid?

2) Adipic acid is used in the manufacture of nylon.  The composition of the acid is 49.3% C, 6.9% H, and 43.8% O (by mass), and the molecular weight is 146 amu.  What is the molecular formula of adipic acid?

3) Phenol is a common hospital antiseptic, and contains only C, H and O in its chemical formula.  Combustion of 5.23 mg of phenol yields 14.67 mg of CO2 and 3.01 mg of H2O.  What is the empirical formula of phenol?

4) Aspirin is prepared by heating salicylic acid (C7H6O3) with acetic anhydride (C4H6O3).  The other product is acetic acid (C2H3OH):

C7H6O3 + C4H6O3  →  C9H8O4 + C2H3OH

What is the theoretical yield of aspirin, C9H8O4, when 2.00 g of salicylic acid is heated with 4.00 g of acetic anhydride?

5) A 50.0 mL volume of AgNO3 solution comtains 0.0285 mol of AgNO3.  What is the molarity of the solution?

6) You have 100.0 mL of a solution in which the concentration of Fe3+ is 0.025 M.  You take 10.0 mL of this solution and dilute it to 100.0 mL.  You then take 20.0 mL of this second solution and dilute it again to 100.0 mL.  What is the concentration of Fe3+ in the final solution?

7) In photographic processes, silver bromide is dissolved by adding sodium thiosulfate:

AgBr(s) + 2 Na2S2O3(aq)  ®  Na3Ag(S2O3)2(aq) + NaBr(aq)

If you want to dissolve 0.125 g of AgBr, how many milliliters of 0.0256 M Na2S2O3 should you add?