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Chemical Equilibrium: The Extent of Chemical Reactions
Terms in this set (38)
If a system at equilibrium is disturbed by changing the concentration of a reactant or product, the equilibrium _______ will shift but the ratio of the product to reactant will be _______ once the system reestablishes equilibrium. The value of K will be ______
position, the same, unchanged
The value of K for the forward reaction is _______ the value of K for the reverse reaction.
the reciprocal of
For the following reaction, what will be observed if the volume is increased at constant temperature? Select all that apply.
2NO2 <-> 2NO + O2
The concentration of all species will decrease at the instant the volume is changed.
The equilibrium position wil shift toward the products.
Le Chatelier's principle states that when a chemical system at equilibrium is disturbed, the system will undergo a net reaction that
An increase in temperate causes
K to increase if delta H > 0
A decrease in temperature causes
K to increase if delta H < 0
If delta H> 0, K will decrease
when temperature decreases
if delta H< 0, K will increase
when temperature increases
The law of mass action reflects the observation that an equilibrium state is reached by a chemical system regardless of the ______ concentrations of reacting substances. In other words a chemical system can reach equilibrium either from the reactant or from the _____
As a reaction is moving from reactants to products (i.e, from left to right as written) toward equilibrium, the value of Q is
Which of the following options correctly describe how a system at equilibrium will respond to change in temperature? Select all that apply.
A change in temperature will cause a change in Kc.
If the forward reaction is exothermic, an increase in temperature causes a shift to the left.
The reaction quotient Qc for a particular reaction is given by the expression [X]^a / [Y]^b. Match the components of this expression correctly for the balanced equation 3O2 <-> 2O3
Which of the following changes will cause the equilibrium shown to shift toward the products? Select all that apply.
Fe3O4 +4H2 <-> 3Fe +4H2O
Remove H2O from the reaction vessel.
Add H2 without changing the volume.
In a closed system a reversible chemical reaction will reach a state of dynamic chemical _______ when the rate of the forward reaction is _______ to/than the rate of the reverse reaction.
An equilibrium calculation can be simplified by taking square roots on both sides of the equation when _______.
both numerator and denominator in the expression for K are perfect squares
Which of the following statements are true about the reaction quotient, Q?
Q expresses a particular ratio of products and reactants at any time during reaction. The expression for Q is the same as the expression for K.
Q = K only at equilibrium.
expresses a particular ratio of product and reaction concentrations for a reaction at equilibrium
expresses a particular ratio of product and reactant concentrations for a reaction at any time
The concentration of pure ____ and _____ are not included in the expression for Q or K for a given reaction.
The law of mass action states that _______.
Equilibrium can be reached from any directions i.e, by beginning with a mixture of reactants or products, or both.
A chemical system reaches a state where the concentrations of reactants and products is a constant ratio.
If the equilibrium constant K for a particular reaction is 1.22e14, which of the following statements correctly describes the reaction?
There are large concentrations of products compared to reactants.
Increase in volume
decrease in pressure
Adding a gaseous reactant
increase in pressure
adding in inert gas
increase in total pressure, but no change in partial pressures of gases
adding a solid
no effect on pressure
In a reaction has a relatively _____ value of K and fairly ______ initial concentrations, equilibrium calculations can be simplified by assuming that the change in concentration (x) is _______ compared to [reactant]init. The assumption is justified as long as x is less than ____% of the initial concentration.
low, high, small, 5
If a system at equilibrium is distributed by a change in concentration, the system will shift to _____ a substance that is added and to _______ a substance that has been removed.
use up, produce
Which of the following is the correct expression for the relationship between Kc and Kp?
The equilbrium constant is a special value of the reaction ______ that occurs when reactant and product concentrations are at their _____ values.
For a given reaction, Kc is the equilibrium constant based on the molar _____ of reactants and products while Kp is the equilibrium constant based on the partial _____ of reactants and products.
Equilibrium favors the reactants: there will be more reactants than products at equilibrium
Both reactants and products will be present in significant amounts at equilibrium
Equilibrium favors the products; there will be more products than reactants at equilibrium
The equilibrium constant K for a system at equilibrium expresses a particular ratio of equilibrium ______ of products and reactants at a particular _______. The value of K is also equal to the ratio of the rate _____ for the forward and reverse reactions.
concentrations, temperature, constants
If the value of K for the forward reaction is less than 1, the value of K for the reverse reaction is ______ than 1.
Which of the following reactants and/or products would not appear in the expression for Q or K for the following reaction?
4HCl + MnO2 <-> MnCl2 + 2H2O +Cl2
To construct the reaction quotient Qc for a given reaction, the _____ concentration placed in the numerator and the _____ concentrations are placed in the denominator. Each term is then raised to the power of its stoichiometric _____ from the balanced equation.
product, reactant, coefficient
The subscript "c" used in the symbols Qc and Kc indicate that these quantitates are based on the ______ of products and reactants.
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