Worksheet: Electrolysis

In this worksheet, we will practice describing the components of electrolytic cells and predicting the products of electrolysis using the reactivity series.

Q1:

What is the purpose of the salt bridge in a galvanic (voltaic) cell?

  • ATo serve as a working electrode
  • BTo complete the electrochemical circuit
  • CTo provide free electrons for redox processes
  • DTo serve as a reference electrode
  • ETo provide a site for oxidative reduction

Q2:

Where does the reduction reaction occur?

  • AAt the anode
  • BWithin the bulk solution
  • CWithin the salt bridge
  • DWithin the potentiometer
  • EAt the cathode

Q3:

Where does the oxidation reaction occur?

  • AWithin the potentiometer
  • BWithin the salt bridge
  • CWithin the bulk solution
  • DAt the anode
  • EAt the cathode

Q4:

An electrolytic cell is formed of many different components.

What name is given to the liquid component of the cell that conducts electricity?

  • AWiring
  • BAnode
  • CCell
  • DElectrolyte
  • ECathode

What name is given to a conductive material that moves charge either to or from the liquid in the cell?

  • AAnode
  • BCathode
  • CElectrode
  • DCell
  • EElectrolyte

Q5:

Which of the following substances cannot be readily electrolyzed?

  • A B a B r ( ) 2 a q
  • B L i C l ( ) a q
  • C M g F ( ) 2 l
  • D N a C l ( ) s
  • E A l C l ( ) 3 l

Q6:

Which of the following substances cannot be readily created using electrolysis?

  • A C l ( ) 2 g
  • B N e ( ) g
  • C N a ( ) s
  • D O ( ) 2 g
  • E A l ( ) s

Q7:

An electric current from a cell is passed through an aqueous solution of an ionic compound AB, as shown in the figure.

Which of the following best describes the behavior of the anions in the electrolytic cell?

  • AAnions are attracted to the anode and oxidized.
  • BAnions are attracted to the anode and reduced.
  • CAnions are attracted to the cathode and oxidized.
  • DAnions are attracted to the cathode and reduced.

Which of the following best describes the behavior of the cations in the electrolytic cell?

  • ACations are attracted to the anode and oxidized.
  • BCations are attracted to the cathode and oxidized.
  • CCations are attracted to the anode and reduced.
  • DCations are attracted to the cathode and reduced.

Q8:

Which of the following is the best description of electrolysis?

  • AThe use of an electric current to drive the dissolution of a solid
  • BThe use of an electric current to drive chemical reactions in a liquid
  • CThe production of an electric current by the dissolution of a solid
  • DThe use of an electric current to produce a solid or gas from a liquid
  • EThe production of an electric current by chemical reactions in a liquid

Q9:

An active metal electrode was found to lose mass as the oxidation–reduction reaction was allowed to proceed. Which part of the cell was the electrode a part of?

  • AAnode
  • BSalt bridge
  • CCathode

Q10:

Which of the following statements is true?

  • AThe anode of a hydrogen fuel cell usually contains a noble metal catalyst.
  • BOxidation takes place at the cathode of a fuel cell.
  • CWater vapor is the only product emitted from an ethanol fuel cell.
  • DOxygen and water react to form hydroxide ions at the anode of a fuel cell.
  • EChemical-to-electrical energy conversion in a fuel cell is typically 10–20%.

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