ASRJC 2025 H2 Chem Electrochemistry Notes

2025 JC2 H2 Electrochemistry ©2025/ASRJC/CHEM 0 ANDERSON SERANGOON JUNIOR COLLEGE JC2 H2 CHEMISTRY ELECTROCHEMISTRY Content I. Overview II. Electrode Potentials & Electrochemical Cells III. Electrolysis & Electrolytic Cells IV. Summary Learning Outcomes Candidates should be able to: (a) describe and explain redox processes in terms of electron transfer and/or of changes in oxidation number (oxidation state) (b) define the terms: (i) standard electrode (redox) potential (ii) standard cell potential (c) describe the standard hydrogen electrode (d) describe methods used to measure the standard electrode potentials of: (i) metals or non–metals in contact with their ions in aqueous solution (ii) ions of the same element in different oxidation states (e) calculate a standard cell potential by combining two standard electrode potentials (f) use standard cell potentials to: (i) explain/deduce the direction of electron flow from a simple cell (ii) predict the spontaneity of a reaction (g) understand the limitations in the use of standard cell potentials to predict the spontaneity of a reaction (h) construct redox equations using the relevant half–equations (i) state and apply the relationship Go = –nFEo to electrochemical cells, including the calculation of Eo for combined half reactions (j) predict qualitatively how the value of an electrode potential varies with the concentration of the aqueous ion (k) state the possible advantages of developing other types of cell, e.g. the H 2/O2 fuel cell and improved batteries (as in electric vehicles) in terms of smaller size, lower mass and higher voltage (l) state the relationship, F = Le, between the Faraday constant, the Avogadro constant and the charge on the electron (m) predict the identity of the substance liberated during electrolysis from the state of electrolyte (molten or aqueous), position in the redox series (electrode potential) and concentration (n) calculate: (i) the quantity of charge passed during electrolysis (ii) the mass and/or volume of substance liberated during electrolysis (o) explain, in terms of the electrode reactions, the industrial processes of: (i) the anodising of aluminium (ii) the electrolytic purification of copper [technical details are not required] References 1. Chemistry for Advanced Level, Cann and Hughes, Murray 2. Understanding Advanced Physical Inorganic Chemistry, Jeanne Tan and Kim Seng Chan 3. Chemistry, The Molecular Nature of Matter and Change (Fourth Edition), Silberberg, McGraw Hill 4. Chemistry The Central Science (Ninth Edition), Brown, LeMay, Bursten, Prentice Hall

2025 JC2 H2 Electrochemistry ©2025/ASRJC/CHEM