Summary
Summary IGCSE CAIE CHEMISTRY UNIT 4: ELECTROCHEMISTRY NOTES
- Course
- Institution
IGCSE CAIE CHEMISTRY UNIT 4: ELECTROCHEMISTRY NOTES COMPREHENSIVE NOTES ON UNIT 4: ELECTROCHEMISTRY
[Show more]
Seller
Follow
balsams
Content preview
🪩Unit 4 Electrolysis
4.1 Electrolysis concepts
Electrolysis is the decomposition of an ionic compound, when molten or in aqueous
solution, by the passage of an electric current.
Only ionic compounds in an aqueous or molten state can undergo electrolysis (the same
goes for metallic compounds but not for covalent compounds)
Key ingredients for electrolysis:
An electrode is a rod of metal or graphite through which an electric current flows
into or out of an electrolyte
Electrolyte the ionic compound in a molten or dissolved solution, containing anions
and cations, that conducts the electricity
An Anode is the positive electrode of an electrolysis cell
A cathode is the negative electrode of an electrolysis cell
Unit 4 Electrolysis 1
, The power supply provides the cathode with a supply of electrons, causing it to become
negatively charged
Positive ions (cations) in the electrolyte move towards the cathode where they gain
electrons
Negative ions (anions) in the electrolyte move towards the anode where they lose
electrons
The electrons move from the anode back towards the power supply
So, in a complete circuit:
Electrons are the charge carriers in the external circuit
Ions are the charge carriers in the electrolyte
Electrolysis of molten compounds and aqueous compounds
w/ examples
Molten compounds
The positive ion will migrate towards the cathode and the negative ion will migrate
towards the anode
Therefore, the cathode product will always be the metal, and the product formed at
the anode will always be the non-metal
Electrolysis of molten lead(II) bromide
Unit 4 Electrolysis 2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller balsams. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75323 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now