Unit 10: Electrochemistry

31. The standard cell potential (E°_cell) is the cell potential measured when:

a) All reactants and products are at 1 M concentration
b) The temperature is 25°C
c) The pressure is 1 atm
d) All of the above
Answer: d) All of the above

32. The electrode reaction in an electrolytic cell is driven by:

a) A spontaneous reaction
b) An external power source
c) The cell’s internal resistance
d) The concentration of ions
Answer: b) An external power source

33. In electroplating, the object being coated is connected to the:

a) Cathode
b) Anode
c) Salt bridge
d) Electrolyte
Answer: a) Cathode

34. The process of converting electrical energy into chemical energy in an electrolytic cell is called:

a) Electrolysis
b) Galvanization
c) Electrodialysis
d) Electrosynthesis
Answer: a) Electrolysis

35. The efficiency of an electrolytic cell is often affected by:

a) The concentration of the electrolyte
b) The temperature of the cell
c) The material of the electrodes
d) All of the above
Answer: d) All of the above

36. The overall cell reaction in a galvanic cell is:

a) The sum of the oxidation and reduction half-reactions
b) The product of the oxidation and reduction half-reactions
c) The average of the oxidation and reduction potentials
d) The difference in the concentrations of reactants and products
Answer: a) The sum of the oxidation and reduction half-reactions

37. The cell potential of a concentration cell is dependent on:

a) The difference in electrode materials
b) The difference in temperature
c) The difference in ion concentrations
d) The type of electrolyte used
Answer: c) The difference in ion concentrations

38. A substance that increases the rate of electrolysis without being consumed is called:

a) An electrolyte
b) A reactant
c) A catalyst
d) A solvent
Answer: c) A catalyst

39. The standard electrode potential of a half-reaction is positive if:

a) The reaction is non-spontaneous
b) The reaction occurs at the cathode
c) The reaction is spontaneous
d) The reaction is at equilibrium
Answer: c) The reaction is spontaneous

40. In a concentration cell, the electrode with lower ion concentration:

a) Acts as the cathode
b) Acts as the anode
c) Has a higher electrode potential
d) Has no effect on the cell potential
Answer: b) Acts as the anode