S'identifier

Chapitre 2

Thermodynamique et cinétique chimique

Réactions chimiques
Réactions chimiques
A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A ...
Enthalpie et chaleur de réaction
Enthalpie et chaleur de réaction
Combustion, commonly known as burning, is a reaction in which a substance reacts with an oxidizing agent, which in most cases is molecular oxygen, to ...
Énergétique de la formation de la solution
Énergétique de la formation de la solution
The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some ...
Entropie et solvatation
Entropie et solvatation
The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for ...
Enthalpie libre et favorabilité thermodynamique
Enthalpie libre et favorabilité thermodynamique
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or ...
Équilibres chimiques et équilibre de solubilité
Équilibres chimiques et équilibre de solubilité
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ...
Loi de vitesse et ordre de réaction
Loi de vitesse et ordre de réaction
The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions ...
Effet du changement de température sur la vitesse de réaction
Effet du changement de température sur la vitesse de réaction
The Arrhenius equation, relates the activation energy and the rate constant, k, for many chemical reactions. In this equation, R is the ideal gas ...
Réactions en plusieurs étapes
Réactions en plusieurs étapes
Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates ...
Énergie de dissociation de liaison et énergie d'activation
Énergie de dissociation de liaison et énergie d'activation
Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as ...
Diagrammes d'énergie, états de transition et intermédiaires
Diagrammes d'énergie, états de transition et intermédiaires
Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction ...
Prédire les résultats de la réaction
Prédire les résultats de la réaction
Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, ...
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