Ch 12: Electrochemistry

Question 1

In the absence of a salt bridge, charge separation develops. The anode develops a positive charge, and the cathode develops a negative charge, quickly halting the flow of electrons. In this state, the battery resembles:

A) a resistor
B) a capacitor
C) a transformer
D) an inductor

Answer 1

B) the result of removing a salt bridge is charge separation. A capacitor is a device that stores electrical energy due to the separation of charge on adjacent surfaces, thus B must be the correct choice.

Question 2

By definition, the standard reference electrode is the site of the redox reaction 2 H⁺ + 2e^- → H₂ (g) which is assigned a potential of ____ volts.

Answer 2

0.00

Question 3

What formula is needed to calculate the free-energy change for a redox reaction in which cell voltage is given?

Answer 3

ΔG° = - nFE°

Question 4

What is Faraday’s constant, (F)?

Answer 4

The magnitude of the charge of one mole of electrons, approximately 96,500 C.

Question 5

If the cell voltage (E°_cell) is positive, the reaction is ___________. If the cell voltage is negative, the reaction is ___________.

Answer 5

spontaneous

nonspontaneous

Question 6

The values for cell potentials are _________ to the identities of the species involved and do not depend on the number of moles of the species. In other words, cell potentials are an _________ property, not an extensive property.

Answer 6

intrinsic

intensive