Introduction -- 1: Definition of Impedance and Impedance of Electrical Circuits -- 2: Definition of Impedance and Impedance of Electrical Circuits -- 3: Determination of Impedances -- 4: Impedance of the Faradaic Reactions in the Presence of Mass Transfer -- 5: Impedance of the Faradaic Reactions in the Presence of Adsorption -- 6: General Method of Obtaining Impedance of Complex Reactions -- 7: Electrocatalytic Reactions Involving Hydrogen -- 8: Dispersion of Impedances at Solid Electrodes -- 9: Impedance of Porous Electrodes -- 10: Semiconductors and Mott-Schottky Plots -- 11: Coatings and Paints -- 12: Self-Assembled Monolayers, Biological Membranes, and Biosensors -- 13: Conditions for Obtaining Good Impedances -- 14: Modeling of Experimental Data -- 15: Nonlinear Impedances (Higher Harmonics) -- 16: Instrumental Limitations -- 17: .