This document discusses key concepts in electrochemical cells including cell diagrams, conventions for cell emf signs, calculating cell emf from single electrode potentials, and the Nernst equation. It also covers the thermodynamics of reversible and irreversible cells as well as calculating Gibbs free energy, enthalpy, entropy, and equilibrium constants for cell reactions. Finally, it discusses single electrode potentials, the electrochemical series and its applications, reference electrodes like the standard hydrogen electrode, and determining pH and acidity constants using various electrodes.