Q. In a galvanic cell, what is the function of the external circuit?
A.
To provide a path for ions
B.
To allow electron flow
C.
To maintain temperature
D.
To store energy
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Solution
The external circuit provides a path for electrons to flow from the anode to the cathode.
Correct Answer:
B
— To allow electron flow
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Q. In a galvanic cell, which reaction occurs at the anode?
A.
Reduction
B.
Oxidation
C.
Neutralization
D.
Hydrolysis
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Solution
In a galvanic cell, oxidation occurs at the anode, where electrons are released.
Correct Answer:
B
— Oxidation
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Q. In an electrochemical cell, what is the anode?
A.
Site of oxidation
B.
Site of reduction
C.
Site of electron gain
D.
Site of ion formation
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Solution
The anode is the site of oxidation where electrons are released.
Correct Answer:
A
— Site of oxidation
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Q. What does the term 'electrolyte' refer to?
A.
A non-conductive solution
B.
A conductive solution
C.
A solid conductor
D.
A gas
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Solution
An electrolyte is a conductive solution that contains ions and can conduct electricity.
Correct Answer:
B
— A conductive solution
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Q. What is the Faraday constant approximately equal to?
A.
96485 C/mol
B.
96500 C/mol
C.
100000 C/mol
D.
90000 C/mol
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Solution
The Faraday constant is approximately equal to 96485 C/mol, representing the charge of one mole of electrons.
Correct Answer:
A
— 96485 C/mol
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Q. What is the main function of a cathode in an electrochemical cell?
A.
To oxidize species
B.
To reduce species
C.
To provide energy
D.
To conduct heat
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Solution
The cathode is where reduction occurs, gaining electrons in the electrochemical cell.
Correct Answer:
B
— To reduce species
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Q. What is the purpose of a salt bridge in a galvanic cell?
A.
To connect the electrodes
B.
To maintain charge balance
C.
To increase voltage
D.
To decrease resistance
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Solution
The salt bridge maintains charge balance by allowing ions to flow between the two half-cells.
Correct Answer:
B
— To maintain charge balance
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Q. What is the relationship between Gibbs free energy and cell potential?
A.
G = -nFE
B.
G = nFE
C.
G = 0
D.
G = nF/E
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Solution
The relationship is given by the equation G = -nFE, where G is Gibbs free energy, n is moles of electrons, F is Faraday's constant, and E is cell potential.
Correct Answer:
A
— G = -nFE
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Q. Which factor does NOT affect the rate of an electrochemical reaction?
A.
Concentration of reactants
B.
Temperature
C.
Surface area of electrodes
D.
Color of the solution
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Solution
The color of the solution does not affect the rate of an electrochemical reaction.
Correct Answer:
D
— Color of the solution
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Q. Which of the following reactions occurs at the cathode?
A.
Oxidation
B.
Reduction
C.
Electron loss
D.
Ionization
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Solution
Reduction occurs at the cathode, where electrons are gained.
Correct Answer:
B
— Reduction
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Q. Which of the following statements about electrolysis is true?
A.
It requires a spontaneous reaction
B.
It is an endothermic process
C.
It involves the decomposition of a compound
D.
It occurs in a galvanic cell
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Solution
Electrolysis involves the decomposition of a compound through the application of electrical energy.
Correct Answer:
C
— It involves the decomposition of a compound
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