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44 Cards in this Set
- Front
- Back
Rate of Rxn depends on |
[Particles], temperature, structure, and orientation |
|
Rate= |
-[ΔA]/Δt |
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As time increases reactant concentration ____ |
Decreases |
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As time increases product concentration ____ |
Increases |
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Rate law = |
Rate = k[A]^n |
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Zero order |
The rate is independent of [A] |
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First order |
The rate is directly proportional to the [A] |
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Second order |
The rate is proportional to the square of the [A] |
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Rate law for a reaction must be determined |
Experimentally |
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First order: ln([A]t/[A]0) = -kt Y=mx+b Y= m= b= |
Y= ln[A]t m= -kt b= ln[A]0 |
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First order y axis Slope = |
Y-axis = Ln[A]t Slope = -k |
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Second order: 1/[A]t - 1/[A]0 = kt Y=mx+b Y= m= b= |
Y= 1/[A]t m= kt b= 1/[A]0 |
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Second order y-axis Slope |
Y-axis = 1/[A]t Slope = +k |
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Zero order y-axis Slope = |
Y-axis = [A] Slope = -k |
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If the half life is constant ___ order rxn |
First |
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If half life depends on initial concentration then ____ order rxn |
Second |
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For second order: as concentration increases the half life _____ |
Increases |
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Zero order k units |
M • s-1 |
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First order k units |
s-1 |
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Second order k units |
M-1 • s-1 |
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What order? |
Second order plot |
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What order |
First order plot |
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What order? |
Zero order plot |
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Order of half like expression? |
First order |
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Order of half like expression? |
Second order |
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Order of half like expression? |
Zero order |
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A= |
Frequency factor / Collison factor |
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Activation energy |
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Activated complex / Transition state |
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ΔHrxn |
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p= z= |
p= orientation factor z= collision frequency |
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Collision frequency |
Number of collisions per unit of time |
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Reaction mechanism |
Steps of a chemical reaction |
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A → products __molecular |
Uni |
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A + A → products __molecular |
Bi |
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A + B → products __molecular |
Bi |
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A + B + C → product __molecular |
Ter |
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Rate determining step |
Slowest step |
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Which is rate determining step? |
First / pink |
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Catalyst |
Increases the rate of rxn Not consumed by the rxn |
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Homogenous catalyst |
Same phase of the reactants |
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Heterogeneous catalyst |
Different phase than reactants |
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Active site |
Specific area where just right to bind to the substrate |
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Substrate |
Reactant molecule that fits into the active site like a key |