Equilibrium
How does adding a catalyst to a system at chemical equilibrium affect the position of that equilibrium?
It shifts it in favor of reactants.
It results in an irreversible shift toward products.
It shifts it in favor of products.
It does not affect the position of equilibrium.
How does decreasing temperature affect an exothermic reaction at chemical equilibrium?
Shifts the equilibrium toward products.
Causes no shift in either direction because temperature changes do not influence exothermic reactions.
Shifts the equilibrium toward reactants.
Stops all reactions due to insufficient thermal energy for movement of molecules or atoms involved in reactions.
When an aqueous solution of a weak acid is diluted with water, how will the position of equilibrium for the acid dissociation reaction shift?
Shifts towards products, favoring increased dissociation.
Shifts unpredictably because dilution rates vary.
No shift occurs since dilution has no overall effect on weak acids.
Shifts towards reactants as the acid becomes less effective.
In a given chemical equilibrium, if the concentration of reactants is increased, what change would occur according to Le Châtelier's Principle?
The system will favor the formation of products.
No change will occur in the position of equilibrium.
The system will favor the formation of more reactants.
The activation energy for the reaction will decrease.
What does Le Châtelier’s Principle state about a system in equilibrium when disturbed by changing conditions?
The position of equilibrium becomes static and unchanging.
There will be no reaction or changes in the system whatsoever.
The position of equilibrium shifts to counteract the change to reestablish an equilibrium.
The system immediately reaches a new balance without any displacement.
How will the equilibrium position of an exothermic reaction shift if the temperature of the system is increased?
Shifts to the left, favoring reactants.
Fluctuates unpredictably due to increased kinetic energy.
Remains unchanged as temperature has no effect.
Shifts to the right, favoring products.
How does a decrease in temperature affect an exothermic reaction at equilibrium?
The equilibrium shifts towards the reactants.
The reaction rate increases without affecting equilibrium.
No change occurs as temperature changes do not affect equilibria.
The equilibrium shifts towards the products.

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What would be the effect on a system at equilibrium if additional reactant is added, assuming volume and temperature remain constant?
More reactant will decompose into its elements.
The system will form more products.
The system will form less products.
The position of equilibrium will remain unchanged.
If a reaction at equilibrium is subjected to an increase in temperature, how does the position of equilibrium shift for an exothermic reaction?
The position of equilibrium continuously oscillates between left and right.
The position of equilibrium remains unchanged.
The position of equilibrium shifts to the right.
The position of equilibrium shifts to the left.
What happens when a catalyst is added into a system that's already at chemical equilibrium?
The reaction stops completely as it's already at equilibrium.
The equilibrium moves toward reactants (left).
The rate of reaction increases with no equilibrium shift occurring.
The equilibrium moves towards products (right).