________ can be classified as homogeneous or heterogeneous homogeneous: They exist in the same phase as the reactants.
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Chemical kinetics
________ deals with the speed at which these changes occur.
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prefix uni
The ________- means one, bi- means two, and ter- means three.
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t1 2
For a first- order reaction, ________ is independent of the initial concentration.
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frequency
A depends on the collision ________ and relative orientation of the molecules.
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Unimolecular step
________: A reaction involving one molecule.
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theory of gases
The kinetic molecular ________ predicts that an increase in temperature raises molecular velocities and so increases the frequency of collisions between molecules.
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value of Ea
The ________ can be found by obtaining the values of k at several temperatures 12.8 Catalysis.
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proportionality constant k
The ________, called the rate constant, and n, called the order of the reactant, must both be determined by experiment.
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identical molecules
When two ________ combine, the resulting molecule is called a dimer.
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original concentration
The time required for a reactant to reach half its ________ is called the half- life of a reactant.
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Bimolecular
________ and termolecular: Reactions involving the collision of two and three species.
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rate law
To experimentally determine the integrated ________ for a reaction, concentrations are measured at various values of t as the reaction proceed.
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zero-order reaction
A(n) ________ has a constant rate.
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Elementary step
________: rate law for the step can be written from the molecularity of the reaction 12.7 A Model for Chemical Kinetics.
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K
________ is the rate constant is the order; not related to the coefficients in the balanced equation.
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Heterogeneous catalysis
________ also occurs in the oxidation of gaseous sulfur dioxide to gaseous sulfur trioxide.
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Reaction mechanism
________, a series of elementary steps that must satisfy two requirements: The sum of the elementary steps must give the overall balanced equation for the reaction.
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order reaction
For a first- ________, a plot of ln [A] versus t is always a straight line.
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Flashcard (20)