5 Steps to a 5 AP Chemistry 2019

CHAPTER

16

Electrochemistry

IN THIS CHAPTER

Summary: Electrochemistry is the study of chemical reactions that produce

electricity, and chemical reactions that take place because electricity is supplied.

Electrochemical reactions may be of many types. Electroplating is an electrochem-

ical process. So are the electrolysis of water, the production of aluminum metal,

and the production and storage of electricity in batteries. All these processes involve

the transfer of electrons and redox reactions.

Keywords and Equations

A table of half-reactions is given in the exam booklet and in the back of this book.

I = current (amperes) q = charge (coulombs)

E° = standard reduction potential K = equilibrium constant

G° = standard free energy

Faraday’s constant, F = 96,500 coulombs per mole of electrons

Gas constant, R = 8.31 volt coulomb mol-^1 K–1

IK G° nFE°

q

t

nE°

==log ∆=−

0.0592























−−

→+

=ln=

0.0592

logat25°C

=[C][D]

[A][B]

whereaA+bB cC dD

cell °°cell cell

cd

ab

EE

RT

nF

QE

n

Q

Q

KEY IDEA

‹^243