Question: What describes the "overall reaction"?
About the article "Electrochemistry", section "Electrolysis of water".

Candidate passages:
A chemical mechanism describes in detail exactly what takes place at each stage of an overall chemical reaction (transformation).
It also describes each reactive intermediate, activated complex, and transition state, and which bonds are broken (and in what order), and which bonds are formed (and in what order).
A complete mechanism must also account for all reactants used, the function of a catalyst, stereochemistry, all products formed and the amount of each.
It must also describe the relative rates of the reaction steps and the rate equation for the overall reaction.
Reaction intermediates are chemical species, often unstable and short-lived, which are not reactants or products of the overall chemical reaction, but are temporary products and reactants in the mechanism's reaction steps.
Reaction intermediates are often free radicals or ions.
Transition states can be unstable intermediate molecular states even in the elementary reactions.
Transition states are commonly molecular entities involving an unstable number of bonds and/or unstable geometry.
They correspond to maxima on the reaction coordinate, and to saddle points on the potential energy surface for the reaction.
The electron or arrow pushing method is often used in illustrating a reaction mechanism; for example, see the illustration of the mechanism for benzoin condensation in the following examples section.
A reaction mechanism must also account for the order in which molecules react.
Often what appears to be a single-step conversion is in fact a multistep reaction. 
In chemical thermodynamics, an endergonic reaction (also called a nonspontaneous reaction or an unfavorable reaction) is a chemical reaction in which the standard change in free energy is positive, and energy is absorbed.
In layman's terms, the total amount of energy is a loss (it takes more energy to start the reaction than what you get out of it) so the total energy is a negative net result.
For an overall gain in the net result see exergonic reaction.
Under constant temperature and constant pressure conditions, this means that the change in the standard Gibbs free energy would be positive  formula_1 for the reaction at standard state (i.e.
at standard pressure (1 bar), and standard concentrations (1 molar) of all the reagents). 
The Chichibabin reaction (pronounced ' (chē')-chē-bā-bēn) is a method for producing 2-aminopyridine derivatives by the reaction of pyridine with sodium amide.
It was reported by Aleksei Chichibabin in 1914.
The following is the overall form of the general reaction:<br>The direct amination of pyridine with sodium amide takes place in liquid ammonia.
Following the addition elimination mechanism first a nucleophilic NH2- is added while a hydride (H-) is leaving.
Ciganek describes an example of an intramolecular Chichibabin reaction in which a nitrile group on a fused ring is the source of nitrogen in amination. 
The Bucherer–Bergs reaction is the chemical reaction of carbonyl compounds (aldehydes or ketones) or cyanohydrins with ammonium carbonate and potassium cyanide to give hydantoins.
The reaction is named after Hans Theodor Bucherer.
"Overall Reaction" 
The novel appears on the ALA’s list of most frequently challenged books in 2004, 2005, and 2011.
The most common reason for the basis of the challenges is the poem “Ice Capades” which describes how Sophie is fascinated by her breasts’ reaction to a cold window pane.