Kinetics Flashcards
In chemical engineering with regards to reactor design, what is the concern referred to with the question: What changes can we expect to occur?
A. Unit operations
B. Thermodynamics
C. Chemical Reaction
D. Nuclear Reaction
B
When designing a reactor what must b searching for the optimum efficiency?
A. Cost of the reactor
B. Alternatives for the process
C. Economics of over-all process
D. Treatment cost of materials and wastes
C
If it takes place in one phase alone. What is the reaction?
A. Homogeneous rxn
B. Hetero
A
Type of reaction that requires the presence of atleast two phases proceed at the rate that it does.
A. Homogeneous rxn
B. Hetero
B
The reaction in which rate equation corresponds to a stoichiometric equation is called
a. elementary reaction
b. parallel reaction
c. non-elementary reaction
d. autocatalytic reaction
A
In which of the following cases does the reaction go farthest to completion?
a. k = 10^2
b. k = 10^-2
c. k = 10
d. k = 1
A
The reaction in which rate equation corresponds to a stoichiometric equation is called
a. elementary reaction
b. parallel reaction
c. non-elementary reaction
d. autocatalytic reaction
A
The rate of formation of B in terms of rA, where ra = -kCACB^2 is?
а. 1/2 гА
b. rA
c. 2ra
d. 3ra
C
If the rate of reaction independent of the concentration of the reactants, the reaction is said to be?
A. 1st order
B 2nd order
C. 3rd order
D. 0th order
D
In a first order reaction the time required to reduce the concentration of reactant from 1 mol/L to 0.5 mol/L will be ___________ that required to reduce it from 10 mol/L to 5 mol/L in the same volume.
a. more than
b. less than
c. same as
d. data insufficient
C
- Half-life period of a chemical reaction is
a. the time required to reduce the concentration of the reacting substance to half its initial value
b. half of the space time of the reaction
c. half of the residence time of the reaction
d. none of these
a
- The half-life of a material undergoing second order decay is
a. proportional to the square of initial concentration
b. independent of initial concentration
c. proportional to initial concentration
d. inversely proportional to initial concentration
D
- For the liquid phase reaction A → P, in a series of experiments in a batch reactor, the half-life was found to be inversely proportional to the square root of the initial concentration of A. The order of the reaction is
a. 3/2
b. 1/2
c. 1
d. 2
A
With increases in temperature, the rate constant obeying Arrhenius equation
a. increases
b. decreases
c. decreases exponentially with temperature
d. can either increase or decrease, depends on the frequency factor
A
Which of the statements is wrong?
a. From Arrhenius Law, the value of the frequency factor, ko does affect the temperature sensitivity.
b. Reactions with high E are very T- sensitive, with low E are relatively T - insensitive
c. Any given reaction is much more T- sensitive at a low T than at a high T.
d. From Arrhenius law, a plot of In k vs 1/T gives a straight line, with large slope for large E and small slope for small E.
A
