O Level Chemistry – Secrets of Redox & Electrolysis Series


For the next 1 week or so, i will be writing and discussing on the basic essentials concepts for Redox & Electrolysis.

Starting with this blog-post i will kick start a Series knows as “Secrets of Redox & Electrolysis“, where we will again discussed on some exam-based questions to see how much we have learned.

For local students taking GCE ‘O’ Level Examinations, these is what you need to know academically:

  • Pure Chemistry StudentsRedox Chapter & Electrolysis Chapters
  • Combine Science (Chemistry) StudentsRedox Chapter only

Based on the SEAB syllabus requirement, you will need to know the following learning outcomes:


  • Define Oxidation & Reduction (Redox) in terms of oxygen/hydrogen gain/loss
  • Define Redox in terms of electron transfer & changes in oxidation state
  • Identify Redox reactions in terms of oxygen/hydrogen gain/loss, electron gain/loss & changes in oxidation state
  • Aqueous potassium iodide & acidified potassium dichromate(VI) in testing for Oxidising & Reducing agents


  • Define Electrolysis
  • Apply the idea of Selective Discharge based on

(i) Cations: linked to the metal reactivity series
(ii) Anions: halides, hydroxides & sulphates
(iii) Concentration effects (electrolysis of conc. & dilute aqueous NaCl)

  • Predict the likely products of the electrolysis of a molten binary compound such as NaCl
  • Predict the likely products of the electrolysis of an aqueous electrolyte (dilute & conc. solutions)
  • Predict the likely products of the electrolysis of water
  • Construct ionic equations for the reactions occurring at the electrodes during the electrolysis
  • Electrolysis of aqueous copper(II) sulphate with copper electrodes as a means of purifying copper
  • Electroplating of metals, e.g. copper plating, and its uses
  • Simple Cells & the production of electrical energy

And these are two chapters that have about 20 marks in your GCE ‘O’ Level Chemistry Examinations – which also means you need to know them! No way for you to skip them!

Coming soon in next blog-posts…………..Definition of Reduction, Oxidation, Redox Reactions & Exam-based questions

Stay Tuned!!!

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Many people talked about teaching Chemistry, I simply LOVE it. I am a passionate Chemistry Coach based in Singapore, Southeast-Asia and aspire to be one of the most dynamic, powerful and humorous speakers in Asia. My 16+ years of coaching experience has equipped me to understand the true reasons why students are not able to perform well in Chemistry, and allow me to structure my teaching methodology to cater to different levels of learners. If you have found this post useful, please share it with your friends. I would really appreciate it! Sean Chua

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