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Level 147

Chemical Mechanics


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elementary reaction
A series of of elementary reaction equations that add up to give a reaction equation
Intermediate species
A species produced in one step of a reaction and consumed in the following step. they cancel out when two elementary reaction equations are added up to give the overall reaction
Bimolecular reactions
Elementary reactions that involve the reaction of two molecules which my or may not be chemically distinct
Unimolecular
A reactions involving a single species. A unimolecular reaction occurs when a molecule rearranges itself to produce one or more products.
collision theory
for a set of reactions to occur, molecules must collide
Activation energy Diagram
A horizontal axis labeled progress of reaction and represents how far the reaction has proceeded from (reactants) to (products).
Activated complex
a transitional structure that results from and effective collision that persists while old bonds are breaking and new bonds are forming.
Steric Equation
Is the (P) representing the fractions of collisions with the correct relative orientations. in kinetic theory for gases equation (K=pze^?Ea/RT)
Arrhenius Equation
An equation Expressing the temperature dependence of a reaction rate constant. K=Ae^Ea/RT
rate determining step
In a multi-step reaction, the slowest step is _
Equilibrium
The state of a body in which there is no change in its motion.
Termolecular Reaction
EXTREMELY rare because the probability of three particles colliding SIMULTANEOUSLY with enough energy and effective orientation is EXTREMELY small
Homogenous Catalyst
A catalyst that is in phase with the reactants, such as using a gaseous catalyst and reacting it with gaseous reactants.
enzymes
biological catalyst
Substrate
Contains aliphatic carbon
Active Site
-small part of enzyme's surface (like a hollow carved into a mountainside)
Michaelis Menten mechanism
A two step process that involves the formation of an intermediate complex between the enzyme and the substrate.
Steady state approximation
Is based on the assumption that the rate at which [ES] is formed is equal to the rate at which it is broken down and thus [ES] maintains a steady state value during the course of a reaction
K_M=k_1+k2/k1
Michaelis Menten Constant
1/R=(K_m/R_Max)(1/[S])+1/R_Max
Lineweaver Burk equation
Lineweaver Burk Plot
a graphical representation of the Lineweaver-Burk equation of enzyme kinetics