MCAT Basics (from MedSchoolCoach) Electrochemistry
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Apr 3, 2025 Explore the fascinating world of electrochemistry! Discover how salt bridges maintain charge balance and the significance of reduction and oxidation potentials. Learn about galvanic and electrolytic cells, visualized with quirky analogies. Get to grips with the Nernst equation to understand non-standard cell potentials. Delve into electroplating and its applications in medicine, from measuring neuronal potentials to powering devices like pacemakers. This deep dive is both informative and engaging!
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Three Cell Types And Their Differences
- Galvanic cells run spontaneously while electrolytic cells require external voltage to proceed.
- Concentration cells are galvanic but use identical electrodes with different ion concentrations to drive current.
Electron Flow And Salt Bridge Role
- Electrons flow from the anode to the cathode through the external wire in all electrochemical cells.
- A salt bridge balances charge so net charge doesn't halt electron flow between compartments.
Use 'Red Cat Ger' To Avoid Errors
- Remember “Red Cat Ger”: reduction occurs at the cathode and is gain of electrons.
- Use this mnemonic and note that the cathode is positive to avoid sign errors on the MCAT.
