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Chapter 13

Chemical Kinetics

QuestionAnswer
Identify the methods used to monitor a reaction as it occurs in the reaction flask Polarimeter Scetrometer Pressure measurement
Give the charateristics of the first order reaction having only one reactant The fate of the reaction is directly proportional to the concentration of the reactant
Give the charateristics of a zero orcer reaction haing only one reactant The rate of the reaction is not proportional to the concentration of the reactant
Give the charateristics of a second order reaction having only one reactant The rate of the reaction is proportional to the square of the concentration of the reactant
What are the units for K in Rate= k[X][Y]^2? 1/M^2s
What are the units for K in Rate= k[X]^2[Y]^2? 1/M^3s
What are the units for K in Rate= k[X][Y]? 1/Ms
What are the units for K in Rate= k[X] and k[X]^0[Y]^0? 1/s
What are the units for K in Rate= k[X][Y]^1/2? M-1/2s-1
What are the units for K in Rate= k[X]^2? M-1s-1
Which of the following represents the integrated rate law for a first-order reaction? ln[A]t/[A]o= -kt
Which of the following represents the integrated rate law for a second-order reaction? 1/[A]t 1/[A]o= kt
Which of the following represents the integrated rate law for the zeroth-order reaction? [A]t-[A]o= -kt
What data should be ploteed to show that experimental concentraction data fits a second-order reaction? ln[reactant] vs. time
What data should be plotted to show that experimental concentration data fits a zeroth-order reaction? [reactant]vs. time
Which of the following statements is FALSE? The half life of a first order reaction is dependent on initial concentraion of reactant The half life of a sencond order reaction is not dependent on concentraion
Derive an expression for a '1/3-life' for a first-order reaction? 1.099/k
Derive an expression for a '1/4-life' for a first-order reaction? 1.386/k
For a reaction, what generally happens if the temp is increased? an increase in k occurs, which results in a faster rate
Identify the rate-determining step. the slowest step
Rate constants are temp dependent
Identify an homogenous catalyst. H2SO4 w/ concentrated HCl
Identify an heterogenous catalyst Pd in H2 gas
In the hydrogenation of double bonds, a catalyst is needed. In the last step, the reactant must escape from the surface into the gas phase. This step is known as Desorption
Biological catalysts that increase the rates of biochemical reactions are known as enzymes
What are the units of k in a zero order reaction? M/s
what are the units of k in a first order reaction? 1/s
What are the units of k in a second order reaction? M-1s-1
Given the law Rate= k[X][Y]^2, how does the rate of reaction change if the concentration of Y is doubled? The rate of reaction will increase by a factor of 4
Give the law Rate= k[X][Y]^2, how does that rate of reaction change if the contration of X is doubled? The rate of reaction will increase by a factor of 2
Given the law Rate= [X][Y], how does the rate of reaction change if the concentration of Y is doubled? The rate of reaction will increase by a factor two
Given the law Rate= k[X]^2[Y]^3, how does the rate of reaction change if the concentration of Y is doubled? The rate of reaction will increase by a factor of 8
Rate= k[A][B]^2, what will happen to the rate of reaction if the concentration of A is increased by a factor of 5.0? the rate will increase by a factor of 5.00
Rate= k[A][B]^2, what will happen to the rate of reaction if the concentration of B is increased by a factor of 3.00? the rate will increase by a factor of 9.00
What is the overall reaction order for the reaction that has the rate law: Rate= k[O2][NO]^2? third order
Given the law Rate= k[X]^2[Y]^3, how does the rate of reaction change if the concentration of X is doubled? The rate of reaction will increase by a factor of four
Which of the following represents the equation for a first-order half-life? t 1/2= 0.693/k
Which of the following represents the equation for a second-order half-life? t 1/2= [A]o/2k
Which of the following represents the equaton for a zero-order half-life? t 1/2= [A]o/2k
Which of the following reactions would you predict to have the smallest orientation factor? NOCl2 + NO --> 2 NOCl
Which of the following reactions would you predict to have a largest orientation factor? H(g) + F(g) --> HF(g)
Which rate law is termolecular? rate=k[A][B]^2
Which rate law is bimolecular? rate=k[A][B]
k A
n, in Rate= k[A]^n reaction order
t1/2 half-life
Ea activation energy
A frequency factor
Define half-life a reaction is the time required for the concentration of a reaction to fall to one-half of its initial value
Define activation energy shows the energy of the molecule as the reaction proceeds
Define frequency factor represents the number of approaches to the activation barrier per unit
Created by: karmabites