S'identifier

Chapitre 14

Équilibre chimique

Équilibre dynamique
Équilibre dynamique
A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When ...
La constante d'équilibre
La constante d'équilibre
Consider the oxidation of sulfur dioxide: For a reaction that begins with a mixture of reactants only, the product concentration is initially equal to ...
Équilibre homogène pour les réactions gazeuses
Équilibre homogène pour les réactions gazeuses
Homogeneous Equilibria for Gaseous Reactions For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar ...
Calcul de la constante d'équilibre
Calcul de la constante d'équilibre
The equilibrium constant for a reaction is calculated from the equilibrium concentrations (or pressures) of its reactants and products. If these ...
Quotient de réaction
Quotient de réaction
The status of a reversible reaction is conveniently assessed by evaluating its reaction quotient (Q). For a reversible reaction described by m A + n B ...
Calcul des concentrations d'équilibre
Calcul des concentrations d'équilibre
Being able to calculate equilibrium concentrations is essential to many areas of science and technology—for example, in the formulation and dosing ...
Principe de Le Châtelier : modification de la concentration
Principe de Le Châtelier : modification de la concentration
A system at equilibrium is in a state of dynamic balance, with forward and reverse reactions taking place at equal rates. If an equilibrium system is ...
Principe de Le Châtelier : modification du volume (pression)
Principe de Le Châtelier : modification du volume (pression)
For gas-phase equilibria, changes in the concentrations of reactants and products can occur with altered volume and pressure. The partial pressure, P, of ...
Principe de le Châtelier : modification de la température
Principe de le Châtelier : modification de la température
Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in ...
Négliger le changement de concentration initiale
Négliger le changement de concentration initiale
If a reaction has a small equilibrium constant, the equilibrium position favors the reactants. In such reactions, a negligible change in concentration may ...
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