Question 1

Which of the following best describes a half-cell in an electrochemical cell?

Accepted Answer

A container with a single electrode immersed in an electrolyte solution representing a half-reaction.

Question 2

In an electrochemical cell, what is the primary function of the salt bridge?

Accepted Answer

To maintain electrical neutrality by allowing ion migration between the half-cells.

Question 3

Which equation correctly represents the cell potential ($$E_{cell}) of an $$electrochemical cell?

Accepted Answer

$$E_{cell} = E_{cathode} - E_{anode}$$

Question 4

If an electrochemical cell has a cell potential ($$E_{cell}) of$$ $$+1.42\ V$$, what can be inferred about the spontaneity of the cell reaction?

Accepted Answer

The reaction is spontaneous.

Question 5

A student sets up an electrochemical cell at $$25^\circ C$$ with $$E_{cell} = +0.80\ V. $$Which of the following statements is correct regarding the flow of electrons?

Accepted Answer

Electrons flow from the anode to the cathode.

Question 6

Which of the following electrochemical cells will produce the largest quantity of electricity at $$25^\circ C$$?

Accepted Answer

Electrochemical Cell C ($$E_{cell} = +1.42\ V)$$

Question 7

Which of the following is NOT a requirement for a standard electrochemical cell?

Accepted Answer

The cell must operate at $$2\ atm$$ pressure.

Question 8

In a galvanic cell, which of the following statements is true?

Accepted Answer

The anode is the site of oxidation.

Question 9

A medical device uses a galvanic cell to power its operation. If the cell potential drops below zero, what will happen?

Accepted Answer

The cell reaction will become non-spontaneous and the device will stop working.

Question 10

Which of the following best explains why a salt bridge is necessary in an electrochemical cell?

Accepted Answer

It completes the electrical circuit by allowing ions to move and maintain charge balance.

Question 11

If the standard reduction potential of the cathode is $$+0.80\ V$$ and the anode is $$-0.40\ V$$, what is the cell potential ($$E_{cell}$$)?

Accepted Answer

$$E_{cell} = +1.20\ V$$

Question 12

Which of the following would increase the cell potential of a standard electrochemical cell?

Accepted Answer

Increasing the concentration of reactants in the half-cells.

Question 13

A student accidentally switches the electrodes in a galvanic cell. What effect does this have on the measured cell potential?

Accepted Answer

The cell potential changes sign (becomes negative if it was positive).

Question 14

Which of the following is the correct definition of a galvanic cell?

Accepted Answer

A cell that generates electrical energy from a spontaneous chemical reaction.

Question 15

In a real-world application, why is it important for the electrodes in a battery to be made of pure metals?

Accepted Answer

Impurities can alter the electrode potential and reduce battery efficiency.

Introduction to Electrochemical Cells

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