Chemical Systems and Equilibrium

Flashcards on Chemical Systems and Equilibrium

Reversible reaction

A chemical reaction that proceeds in both the forward and reverse directions.

Chemical equilibrium

A state in a chemical system in which the forward reaction and the reverse reaction are occurring at the same rate.

Dynamic equilibrium

A chemical system at equilibrium that is changing at the molecular level, while its macroscopic properties remain constant.

Closed system

A system where the system must be in order to reach equilibrium.

Homogeneous equilibrium

A chemical system in equilibrium in which all of the components are in the same physical state.

Heterogeneous equilibrium

A chemical system in equilibrium in which the components are in different physical states.

Law of Chemical Equilibrium

Also known as the law of mass action, it states that in a chemical system at equilibrium, there is a constant ratio between the concentrations of the products and the concentration of the reactants.

Equilibrium constant (Keq)

The ratio of equilibrium concentrations for a particular temperature.

Le Châtelier’s Principle

If a chemical system in a state of equilibrium is disturbed, the system will undergo a change that shifts its equilibrium position in a direction that reduces the effect of the disturbance.

Reaction quotient (Qc or Qp)

A numerical value determined by using the same formula as the equilibrium constant using data for a reversible reaction that may or may not be at equilibrium.

ICE Tables

Used to calculate equilibrium concentrations with the following components: I = initial molar concentrations, C = change in concentration, and E = equilibrium molar concentrations.