CHM135H1 Lecture Notes - Lecture 6: Stoichiometry, Electromotive Force, Thermodynamics
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CHM135H1 Full Course Notes
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It is the interconversion of chemical and electrical energy. Spontaneous reactions can produce electricity and electricity can cause non spontaneous reactions to occur: redox reaction. Redox reactions involve the movement of electrons from one species to another: oxidation is the loss of electrons. First balance atoms other than o and h, then balance o atoms by adding water molecules, then balance h by adding hydrogen ions: charge is balanced by adding electrons (e-, electrons should cancel out in net reaction. It completes the circuit, and removes change imbalance: anode: is the electrode where oxidation takes place, cathode: is the electrode where reduction takes place. ***example: a galvanic cell: shorthand notation for galvanic cells. In a redox reaction, there is a competition for elections. The differing abilities of the metals to gain electrons gives rise to a voltage drop. This is also known as electromotive force or cell potential. Ecell is measured in volts (v), where =(cid:1836)/.
