⚡ Redox Reactions – Oxidation, Reduction, and Electrochemistry Essentials
Redox reactions—reduction-oxidation—appear everywhere: cell metabolism, photosynthesis, batteries, and electrochemical cells. For the DAT, you must understand how electrons move, how oxidation numbers change, and how electrochemical cells function.
Today’s blog explains redox processes simply, with a DAT-focused strategy.
🔬 Redox Basics: Oxidation and Reduction
| Term | Meaning | Mnemonic |
|---|---|---|
| Oxidation | Loss of electrons | OIL (Oxidation Is Loss) |
| Reduction | Gain of electrons | RIG (Reduction Is Gain) |
🧠 Electrons always move from oxidized species → reduced species.
🔋 Electrochemical Cells on the DAT
| Type | Energy Source | Anode Reaction | Cathode Reaction | Key Points |
|---|---|---|---|---|
| Galvanic Cell | Spontaneous | Oxidation (-) | Reduction (+) | Produces energy (battery) |
| Electrolytic Cell | Non-spontaneous | Oxidation (+) | Reduction (-) | Requires external energy |
🧠 Mnemonic: "An Ox, Red Cat" → Anode = Oxidation, Cathode = Reduction
🧮 Oxidation Number Rules (DAT Quick Reference)
| Element Type | Oxidation Number |
|---|---|
| Free Element (e.g., O₂, Fe) | 0 |
| Monatomic Ion (e.g., Na⁺, Cl⁻) | Same as ion charge |
| Oxygen (usually) | –2 |
| Hydrogen (usually) | +1 |
| Group 1/2 Elements | +1 / +2 respectively |
✅ Add oxidation numbers → total = charge on molecule or ion
📈 DAT-Style Practice Question
Q: In the reaction Fe³⁺ + 3e⁻ → Fe, what is happening to Fe³⁺?
A: It is being reduced (gains electrons).
✅ DAT loves electron flow questions!
🎯 DAT Strategy Tips
✅ Remember OIL RIG every time
✅ Identify the anode (oxidation) and cathode (reduction) in cells
✅ Practice assigning oxidation numbers fast
✅ Know that galvanic cells are spontaneous
✅ Use KOTC visuals and mnemonics to master in minutes
Practice more at kingofthecurve.org/studyscience
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Download the KOTC App and access:
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⚡ Energize your DAT prep—crush redox with KOTC.
Frequently Asked Questions (FAQs)
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Aim for 4-6 focused hours, ensuring you incorporate breaks to avoid burnout.
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Practice mindfulness techniques, take practice exams under realistic conditions, and maintain a balanced lifestyle.
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Set short-term goals, seek support from mentors, and reward yourself for small achievements.
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Regular exercise improves focus, reduces stress, and enhances overall mental clarity.
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