Electrochemistry - Electrode Potentials - Redox (5.6)

Question 1

Redox reactions can be combine in an electrochemical cell. (True or False?)

Answer 1

True.

Question 2

What do multiple electrochemical cells make?

Answer 2

Batteries.

Question 3

In an electrochemical battery, where does reduction take place and what happens?

Answer 3

Reduction takes place at the cathode where positive cations pick up electrons.

Question 4

In an electrochemical battery, by what are ions transferred?

Answer 4

A salt bridge.

Question 5

In an electrochemical battery, where does oxidation take place and what happens?

Answer 5

Oxidation takes place at the anode, where elements donate their electrons to the circuit and become cations.

Question 6

Are electrode potentials measured relative to a standard hydrogen electrode under standard conditions? If so, what are the conditions?

Answer 6

Yes they are. (298K - temperature , 100 kPa - pressure).

Question 7

What do relative electrode potentials show?

Answer 7

How easily an ion is oxidised or reduced.

Question 8

The more positive the electrode potential, the less likely reduction will happen. (True or False?)

Answer 8

False - it is more likely reduction will happen with the more positive electrode potential.

Question 9

The rusting of iron is an electrochemical process. )True or False?)

Answer 9

True - there is oxidation of iron.

Question 10

What happens in sacrificial protection? (rusting of iron)

Answer 10

Placing a metal that has a more negative electrode potential in contact with iron prevents rusting, as the metal is oxidised in preference to iron.