Chapter 21 - Electrochemisry

Question 0

How does a voltaic cell work?

Answer 0

A voltaic cell consists of 2 half-cells, in which either oxidation or reduction occurs. The 2 half cells consists of a piece of metal dipped in a solution of it’s ions. They’re connected by a salt bridge which allows ions to pass from each cell. A wire carries the e-‘s from the anode to the cathode.
Anode = OX occurs (-)
Cathode = RED occurs (+)

Question 1

What’s an electrochemical cell?

Answer 1

Any device that concerts chemical energy into electrical energy or the opposite. Redox reactions occur in all electrochemical cells.

Question 2

What metal is more easily oxidized, lead (Pb) or calcium (Ca)? (Refer to Table 21.1)

Answer 2

Calcium. B/c it’s more active.