Electrochemistry

Practice Test
      
  1.This reaction occurs at the anode of an electrolytic cell.  
  a.   redox  
  b.   synthesis  
  c.   oxidation  
  d.   reduction  
      
  2.A Hall-Heroult electrolytic cell is used to produce _________________.  
  a.   aluminum metal  
  b.   sodium metal  
  c.   chlorine gas  
  d.   molten iron  
      
  3.Which of the following must be true of a salt bridge?  
  a.   The salt bridge must prevent the flow of charged particles.  
  b.   Ions can move through the salt bridge.  
  c.   The solutions joined by the salt bridge can mix freely.  
  d.   The tube of the salt bridge must remain open.  
      
  4.Potential difference is expressed in _________.  
  a.   current  
  b.   amperes  
  c.   ohms  
  d.   volts  
      
  5.What is the cathode in the electrolytic cell used for silver plating?  
  a.   the silver metal source  
  b.   the object to be plated  
  c.   the power source  
  d.   the electrolyte solution  
      
  6.This reaction takes place at the cathode during the electrolysis of molten magnesium chloride.  
  a.   Cl2+ 2e- 2Cl-  
  b.   Mg2+ + 2e- Mg  
  c.   Mg Mg2+ + 2e-  
  d.   2Cl- Cl2+ 2e-  
      
  7.


A process in which electricity causes a nonspontaneous chemical reaction is called _________________.		  
  a.   photogenesis  
  b.   synthesis  
  c.   hydrolysis  
  d.   electrolysis  
      
  8.To prevent corrosion, metal garbage cans and other iron objects are dipped into _____________.  
  a.   liquid oxygen  
  b.   hydrochloric acid  
  c.   molten zinc  
  d.   hydrogen peroxide  
      
  9.Alessandro Volta proved that electricity can be generated by ______________.  
  a.   gold foil  
  b.   dissimilar metals  
  c.   two samples of the same metal in a solution  
  d.   frogs' legs  
      
  10.The anion in an aqueous ammonium nitrate solution is ___________.  
  a.   N3-  
  b.   O2-  
  c.   NH4+  
  d.   NO3-  
      
  11.What reaction occurs when a strip of tin is immersed in an aqueous calcium nitrate solution?  
  a.   Sn Sn2+ + 2e-  
  b.   None  
  c.   Ca Ca2+ + 2e-  
  d.   Sn Sn4+ + 4e-  
      
  12._____________ forms at the cathode of a Downs cell.  
  a.   Chlorine gas  
  b.   Oxygen gas  
  c.   Hydrogen gas  
  d.   Liquid sodium  
      
  13.The cation in an aqueous rubidium chromate solution is ___________.  
  a.   Rb+  
  b.   Cr3+  
  c.   CrO4-  
  d.   Rb2+  
      
  14.This reaction occurs at the cathode of an electrolytic cell.  
  a.   oxidation  
  b.   decomposition  
  c.   redox  
  d.   reduction  
      
  15.This element is used in pacemaker batteries.  
  a.   potassium  
  b.   boron  
  c.   arsenic  
  d.   lithium  
      
  16.


A galvanic cell that has been packaged as a portable power source may be called a/an _________.		  
  a.   battery  
  b.   cathode  
  c.   ammeter  
  d.   anode  
      
  17.The Hall-Heroult process is expensive because it consumes so much ______________.  
  a.   chlorine  
  b.   electricity  
  c.   steel  
  d.   oxygen  
      
  18.If you wanted to electroplate a metal object with silver, you would use silver as the ________________.  
  a.   metal to be plated  
  b.   anode  
  c.   battery  
  d.   cathode  
      
  19.A/an ____________ can be used to restore charge balance in a galvanic cell.  
  a.   voltmeter  
  b.   cathode  
  c.   salt bridge  
  d.   anode  
      
  20.This is a product of the major reaction occuring in a carbon-zinc dry cell.  
  a.   H2O2  
  b.   Zn  
  c.   MnO2  
  d.   Zn2+  
      
  21.Why are alkaline dry cell batteries smaller in size than zinc-carbon dry cells?  
  a.   Alkaline batteries do not require steel cases.  
  b.   Alkaline batteries do not need the carbon rod cathode.  
  c.   No zinc is reduced in the alkaline batteries.  
  d.   Zinc paste takes up less space than zinc powder.  
      
  22.


The carbon rod in the center of a carbon-zinc dry cell serves as the ____________.		  
  a.   anode  
  b.   cathode  
  c.   electrolyte  
  d.   salt bridge  
      
  23.What is the oxidation half-reaction in a copper-zinc galvanic cell?  
  a.   Zn Zn2+ + 2e-  
  b.   O2 2O2- + 4e-  
  c.   2Cl- Cl2+ 2e-  
  d.   Cu Cu2+ + 2e-  
      
  24.Chemical energy is converted into electrical energy in a _______________.  
  a.   electrical cell  
  b.   galvanic cell  
  c.   motor  
  d.   electrolytic cell  
      
  25. A lead storage battery contains several cells filled with a solution of ________________.  
  a.   zinc sulfate  
  b.   silver nitrate  
  c.   sodium hydroxide  
  d.   sulfuric acid  
      
  26.What is the anode reaction when a NiCad battery is used to generate electric current?  
  a.   reduction of cadmium in the presence of an acid  
  b.   oxidation or cadmium in the presence of a base  
  c.   reduction of cadmium in the presence of a base  
  d.   oxidation of cadmium in the presence of an acid  
      
  27.The _________ storage battery can usually be discharged and recharged more than 500 times.  
  a.   nicad  
  b.   alkaline  
  c.   anode  
  d.   carbon-zinc  
      
  28.This element is sometimes electroplated onto other metals to make them shiny and to improve their hardness, stability, and appearance.  
  a.   sodium  
  b.   magnesium  
  c.   chromium  
  d.   zinc  

 
   
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