In this I/GCSE chemistry blog part 1, we will introduce the process of electrolysis and ways to remember the features of this process.
Purpose of electrolysis
Electrolysis:
The process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them.
Used to extract metals higher than carbon in the reactivity seires
Electrodes: A conductor which allows current to flow through an electrolyte
Electrolyte: A chemical compound that dissociates in solution into ions
PANIC
Positive
Anode
Negative
Is
Cathode
- Postive electrodes are called anodes. The ions are called anions.
Reduction occurs at the anode.
- Negative electrodes are called cathodes. The ions are called cations.
Oxidation occurs at the cathode.
Electroplating
Electroplating is to:
- protect a metal
- make something more attractive
- increase an object more resistant to scratching
- cheaper
The solution contains ions of the of the plating metal
Half equations for electroplating with zinc
- Anode: Zn ---> Zn+2 + 2e-
- Cathode: Zn2+ + 2e- ----> Zn
That is all for part 1!
References:
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.assignmentpoint.com%2Fscience%2Fchemistry%2Felectroplating.html&psig=AOvVaw1S8ySZB-BsAdtkYzYkl4FN&ust=1628505507908000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCNjXivedofICFQAAAAAdAAAAABAJ