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24 Cards in this Set
- Front
- Back
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What is an elementary reaction?
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An elementary reaction is a reaction that cannot be decomposed into other reactions.
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T/F
A complex reaction can be broken down into two or more elementary reactions. |
True
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What is an intermediate?
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An intermediate is a complex that appears during the course of a reaction but does not appear in the net reaction, or as a final product.
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What is the rate determining step of a reaction?
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The rate determining step is the slowest step of a reaction.
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What is the general formula for the rate law of the following reaction?
aA + bB---->cC + dD |
Rate= k[A]^x[B]^y
*remember RATE LAW |
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T/F Rate= - change[reactant]/time or
Rate= change [products]/ time |
True
The neg sign indicates loss or reactants |
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What is the reaction order for the following rate law?
rate=k[A][B]^2 |
Reaction order =3
x=1 and y=2 therefore x+y= reaction order |
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Is the rate of a zero order reaction dependant on the concentration of the reactants?
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No!!
A zero order reaction has a constant rate that is independant of the concentration of reactants. |
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look at
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C34 graph....
resume |
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What is enthaply change of a reaction?
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Enthalpy change of a reaction is the difference between the potential energy of the products and the potential energy of the reactants.
products-reactants= change in delta H |
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How do increasing temperature and reactant concentration affect the rate of reaction?
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Increasing temperature and reactant concentration increase the rate of most reactions.
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Can the medium in which a reaction takes place affect the reaction rate?
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Yes
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How does a catalyst increase reaction rate?
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A catalyst increases the reaction rate by decreasing the Ea.
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What is the reaction RATE of the following one step reaction?
2A + B----> A2B |
Rate=k[A]^2[B]
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What is the equ' constant expression for the following reation?
A + 3B----> 2C + 2D |
Keq = [C]^2[D]^2/ [A][B]^3
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Does Keq for a reaction remain constant at all temperatures?
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No..it is characteristic of a given system at a given temperature.
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Do pure solids and liquids appear in an equ' constant expression?
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No
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If there is much more product than reactant at equ', what can be said of Keq
(as compared to 1)? |
Keq whould be greater than one
at equ' then is would be close |
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If Keq is very small compared to 1, then what can be said about the amount of reactants and products at equ'?
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more reactants than productat at equ'
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According to Le Chatelier's Principle, in which direction will equ' shift if products are removed?
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equ will shift to favor the forward reaction.
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How will increasing the pressure affect the following reaction?
4 mole >< 2 moles |
Increasing pressure will favor the forward reaction. >
Towards side with less |
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T/F Increasing the pressure of a system will shift equ' so as to increase the number of moles produced.
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False, increasing the pressure will shift equ' so as to produce fewer mole of gas.
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How will decreasing the temperaure affect the following reaction?
A >< B + heat |
Decreasing the temperature will favor the foward direction.
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What happens when you increase the temperature for the same reaction?
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Increasing temperature will favor the reverse reaction.
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