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14 Cards in this Set
- Front
- Back
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What is chemical equilibrium, with regards to rate of reaction ?
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It is when the forward reaction's rate is equal to the reverse reactions rate.
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Write the equation for the equilibrium constant for the following reaction:
aA + bB --><-- dD + eE |
Kc = ([D]^d . [E]^e) / ([A]^a [B]^b)
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True or false: If gasses are in equilibrium, you can use the partial pressures to calculate the equilibrium constant.
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True.
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Write the equilibrium constant expression for the following reaction using their partial pressures:
aA --><-- dD |
Kp = (PD)^d / (PA)^a
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What is the equilibrium constant in terms of Kp ?
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Kp = Kc x (RT)^[n of products - n of reactants]
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How would you interpret a large value for Kc and a value below 1 for Kc ?
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1. A large Kc value above 1 tells us that most of the molecules in the system are products
2. A Kc value below 1 tells us that most of the molecules in the system are the reactants |
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True or false: The equilibrium constant depends on the amount of mol of each substance in the reaction.
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True.
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What is a reaction quotient ?
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A number obtained by substituting starting concentrations or partial pressures into an equilibrium constant expression.
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How would you interpret a relatively large and small reaction quotient when compared to an equilibrium constant value.
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1. A large reaction quotient means that most of the substances are products, therefore the reverse reaction will be favored
2. A small reaction quotient means that most of the substances are reactants, therefore the forwards reaction will be favored |
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What is le Chatelier's principle ?
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When an equilibrium is disturbed the system will shift its equilibrium position so as to counteract the effect of the disturbance.
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What will the effect of an increase in pressure be on an equilibrium ?
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The system will try to counteract the disturbance, thereby reducing the pressure. The system will do so by favoring the reaction that produces the least amount of gas molecules.
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What will the effect of an increase in temperature be on an equilibrium ?
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The system will try to counteract the disturbance, thereby reducing the temperature. The system will do so by favoring the endothermic reaction.
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What is the effect of a catalyst on an equilibrium ?
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A catalyst will increase both the rates of the forward and reverse reaction, but no concentration change will take place because the system stays in equilibrium.
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Which factors will shift an equilibrium constant ?
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1. Change in concentration of substances
2. Change in temperature of substances 3. Change in pressure of system |
