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Apologia Chem M15A

Chemical equilibrium

QuestionAnswer
chemical equilibrium the point at which both the forward and reverse reactions in a chemical equation have equal reaction rates
When chemical equilibrium occurs, the amounts of each substance in the chemical equation will not change, despite the fact that both reactions still proceed.
double arrow indicates that a particular reaction can operate in either direction
forward reaction when the reaction proceeds in the normally notated manner
reverse reaction when the products in a reaction begin reversing the original process
Chemical reactions _____ ______ start at chemical equilibrium. do not.
The forward and reverse reactions in an equilibrium have different rates.
K = equilibrium constant
The eq subscript on each concentration term on Equation 15.1 reminds us that to calculate the equilibrium constant, we must always use the concentrations of the substances once equilibrium is reached.
The equilibrium constant never changes as long as the temperature doesn't change.
The equilibrium constant can be used as a gauge to tell us the relative concentrations of reactants and products when the reaction reaches equilibrium.
If the equilibrium constant for a chemical reaction is very large, there will be a lot of products and only a few reactants.
If the equilibrium constant for a chemical reaction is small, there will be a lot of reactants and only a few products.
When the equilibrium constant is close to 1, then there will be approximately equal amounts of reactants and products.
When an equilibrium reaction has more products than reactants at equilibrium, we say it is weighted towards the products side of the equation.
When an equilibrium reaction has more reactants than products at equilibrium, we say it is weighted towards the reactants side of the equation.
If K = 46,000, then the arrow for the reaction should point to the right.
If K = .00002, then the arrow for the reaction should point to the left.
If K = 1.2, we need to keep a double arrow.
When a solid or liquid appears in a chemical equation, it is not included in equation 15.1.
When a molecule or atom appears in the aqueous phase in a chemical equation, we do include it in equation 15.1.
Created by: MrsHough
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