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Definition
| A state of dynamic balance in which the rate of formation of the products of a reaction from the reactants equals the rate of formation of the reactants from the products; at equilibrium the concentrations of the reactants and products remain constant. |
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Term
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Definition
| The numerical value of the equilibrium-constant expression for a system at equilibrium. The equilibrium constant is most usually denoted by KP for gas-phase systems or KC for solution-phase systems. |
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Term
| Equilibrium-constant Expression |
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Definition
| The expression that describes the relationship among the concentrations (or partial pressures) of the substances present in a system at equilibrium. The numerator is obtained by multiplying the concentrations of the substances on the product side of the equation, each raised to a power equal to its coefficient in the chemical equation. The denominator similarly contains the concentrations of the substances on the reactant side of the equation. |
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Definition
| The catalyst system and conditions of temperature and pressure developed by Fritz Haber and coworkers for the formation of NH3 from H2 and N2 |
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Definition
| The equilibrium established between substances in two or more different phases, for example, between a gas and a solid or between a solid and a liquid. |
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Definition
| The equilibrium established between reactants and products substances that are all in the same phase. |
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Definition
| The rules by which the equilibrium constant is expressed in terms of the concentrations of reactants and products, in accordance with the balanced chemical equation for the reaction. |
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Term
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Definition
| A principle stating that when we disturb a system at chemical equilibrium, the relative concentrations of reactants and products shift so as to partially undo the effects of the disturbance. |
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Term
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Definition
| The value that is obtained when concentrations of reactants and products are inserted into the equilibrium expression. If the concentrations are equilibrium concentrations, Q = K, otherwise, Q ≠ K. |
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