Introduction to Electrochemistry
Electrochemistry explores the relationship between electricity and chemical reactions. Batteries, electroplating, and electrolysis are practical applications that use electrical energy to drive or harvest chemical reactions.
What You Need to Know
Key Concept Diagram
Electrolysis uses electrical energy to drive a non-spontaneous chemical reaction
In electrolysis, the positive electrode (anode) is where oxidation occurs; the negative (cathode) is where reduction occurs
Batteries convert chemical energy into electrical energy through spontaneous reactions
Electroplating uses electrolysis to coat an object with a thin layer of metal
Key Vocabulary
Electrolysis
Using electrical energy to drive a non-spontaneous chemical reaction
Electrode
A conductor through which electricity enters or leaves the electrolyte
Anode
The positive electrode in electrolysis, where oxidation occurs
Cathode
The negative electrode in electrolysis, where reduction (metal deposit) occurs
Knowledge Check
Select the correct answer for each question. Click "Check Answer" to see if you are right.
Question 1
In the electrolysis of water, which gas is produced at the negative electrode (cathode)?
Question 2
Electroplating is used to:
Question 3
What energy conversion happens in a battery?
Key Concepts Summary
- ●Electrolysis uses electrical energy to drive a non-spontaneous chemical reaction
- ●In electrolysis, the positive electrode (anode) is where oxidation occurs; the negative (cathode) is where reduction occurs
- ●Batteries convert chemical energy into electrical energy through spontaneous reactions
- ●Electroplating uses electrolysis to coat an object with a thin layer of metal