Chemistry: Matter and Change- Chapter 18

Reversible Reaction
Reaction that can occur in both forward and the reverse direction.

Chemical Equilibrium
State in which the forward and reverse reactions balance each other because they take place at equal rates.

Law of Chemical Equilibrium
States that at a given temperature, a chemical system may reach a state in which a particular ratio of reactant and product concentrations has a constant value.

Equilibrium Constant
Numerical value of the ratio of product concentration to reactant concentrations, with each concentration raised to the power corresponding to it’s coefficient in the balanced equation.

Homogeneous Equilibrium
All the reactants and products are in the same physical state.

Heterogeneous Equilibrium
When reactants and products of a reaction are present in more than one physical state.

Le Châtelier’s Principle
If stress is applied to a system at equilibrium, the system shifts in the direction that relieves the stress.

Solubility Product Constant
An equilibrium constant for the dissolving of a sparingly soluble ionic compound in water.

Common Ion
Ion that is common to two or more ionic compounds.

Common Ion Effect
The lowering of the solubility of a substance by he presence of a common ion.

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