Oxidation-Reduction Reactions

Practice Test
      
  1.This substance is usually the top industrial chemical produced in the United States.  
  a.   ammonia  
  b.   sulfuric acid  
  c.   sodium hydroxide  
  d.   chlorine  
      
  2.___________________ allow you to determine the approximate pH of a solution.  
  a.   Beakers  
  b.   Acid-base indicators  
  c.   Anhydrides  
  d.   Equations  
      
  3.How many moles of magnesium atoms is 7.32 × 1026 atoms?  
  a.   6.02 × 103 mol  
  b.   8.23 × 1026 mol  
  c.   4.44 × 101 mol  
  d.   1.22 × 103 mol  
      
  4.Large deposits of solid, elemental __________ are formed in redox reactions near the vents of some volcanoes.  
  a.   chlorine  
  b.   oxygen  
  c.   hydrogen  
  d.   sulfur  
      
  5.Driven by concentration difference, the movement of molecules through a semipermeable memebrane is called ___________.  
  a.   boiling  
  b.   osmosis  
  c.   reverse movement  
  d.   capillarity  
      
  6.H2O is sometimes called ________________.  
  a.   a poor solvent  
  b.   a specific solute  
  c.   a solution  
  d.   the universal solvent  
      
  7.The pH scale is used to express the concentrations of hydronium ions and _____________ ions in aqueous solutions.  
  a.   hydroxide  
  b.   potassium  
  c.   carbon  
  d.   fluoride  
      
  8.How does paint protect steel surfaces from corrosion?  
  a.   Paint corrodes leaving steel intact.  
  b.   Paint acts as a sacrificial anode.  
  c.   Paint prevents the oxidation-reduction reaction of corrosion from occurring.  
  d.   Paint galvanizes steel.  
      
  9.What is the oxidation number of iron in Fe2O3?  
  a.   3+  
  b.   2-  
  c.   2+  
  d.   1+  
      
  10. 22.5 mL of 0.122 M HCl neutralizes 30.0 mL of a KOH solution. What is the molarity of the KOH solution?  
  a.   0.00445 M  
  b.   0.0915 M  
  c.   1.08 M  
  d.   0.163 M  
      
  11.What is the base in the reaction HI + H2O H3O + I-?  
  a.   HI  
  b.   H2O  
  c.   Isub>2  
  d.   H3O+  
      
  12.What will be the acid-base condition of the solution when ammonium citrate is dissolved in water?  
  a.   acidic  
  b.   basic  
  c.   The acid-base condition cannot be determined.  
  d.   neutral  
      
  13.Determine the net change in oxidation number of chlorine in the following reaction: ClO4- (aq) + Br- (aq) ® Cl- (aq) + Br2(g) (in acid solution)  
  a.   8  
  b.   -8  
  c.   -7  
  d.   7  
      
  14.Calculate the mass in grams of 0.0790 moles of aluminum.  
  a.   1.0 g  
  b.   21 g  
  c.   34 g  
  d.   2.1 g  
      
  15.How many moles of calcium are in 0.544 g of calcium?  
  a.   0.0773  
  b.   0.554  
  c.   3.11  
  d.   0.0136  
      
  16.Capillarity accounts for the rising of liquids in ___________________.  
  a.   narrow tubes  
  b.   rivers  
  c.   soda bottles  
  d.   oceans  
      
  17.According to the equation 2HBr + Na2CO3 NaBr + H2O + CO2, what volume of CO2 at 1.230 atm and 325 K is produced by 50.0 g of HBr reacting with an excess of Na2CO3?  
  a.   1.52 L  
  b.   22.4 L  
  c.   50.0 L  
  d.   6.70 L  
      
  18.What is the formula for perchloric acid?  
  a.   HClO3  
  b.   HClO4  
  c.   HCl  
  d.   HClO2  
      
  19.Which of these combinations will NOT make an acid-base buffer?  
  a.   HCN/KCN  
  b.   NH3/NH4NO3  
  c.   HC2H3O2/NaC2H3O2  
  d.   NaOH/NaCl  
      
  20.A ________________ solution contains more than the usual maximum amount of solute.  
  a.   concentrated  
  b.   dilute  
  c.   supersaturated  
  d.   saturated  

 
   
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