CRE Flashcards
Chemical kinetics can predict
rate of reaction
How do you write the intrinsic reaction rate of B for the reaction A + 2B = C?
1/2(-rB)
If n is the order of reaction the unit of rate constant is
[concentration]^(1-n) t^(-1)
Which of the following is the rate equation for the elementary dimerization reaction of A?
-rA = kCA^2
Which intermediates are species in transit and cannot be isolated
transition states
For the reaction 2A + B → P, the rate law is -rB = kCACB. If the reaction is written as A + 1/2B → 1/2 P, what will be the rate law?
-rB = kCACB
Half-life period for a first order reaction is ____ the initial concentration of the reactant
independent of
For a given parallel reaction, the product distribution is not affected by reactor type. The best way to control product distribution is
to use a selective catalyst
Which type of reactor is recommended to effect reactions involving expensive reactants and highly valuable product
batch reactor
Between a CSTR and a PFR, which is better for an isothermal operation? Assume all variables and operating conditions are same for both
CSTR
The time-course of the reactant concentration gathered from a batch reactor, when plotted, does not give a straight line. However, when the reciprocal of the concentration is plotted against time, a straight line is obtained. What is the order of the reaction?
2
When designing a reactor, what must be considered in searching for the optimum efficiency?
economics of the overall process
Which of the following (with regards to the variables) does not affect the progress of homogeneous reactions?
Container shape of the reactor and the diffusional characteristics of the fluid feed
What makes the integral method different from differential method of analyzing kinetic data?
A particular form of the equation is guessed and predicts that the plot of data results in a straight line
What is happening to the instantaneous fractional yield in single backmix reactors?
It varies with concentration
