Chemical Reaction Engineering Flashcards
If “n” is the order of reaction, then unit of rate constant is
a. 1 / (time) (concentration)n-1
b. (time)-1(concentration)n-1
c. (time)n-1 (concentration)
d. none of these
A.
Unit for zero-order reaction
Concentration per time (mol/L-s)
Unit for first-order reaction
Per time (/s)
Unit for second-order reaction
1/Concentration-time (L/mol-s)
The reaction in which rate equation corresponds to a stoichiometric equation is called
Elementary reaction
If the rate of reaction independent of the concentration of the reactants, the reaction is said to be?
Zero order
The ____ the k, the further the reaction is toward completion
Higher
If the reaction, 2 A + B –> C is second order, which of the following plots will give a straight line?
a. log CA vs time
b. CA vs time
c. log CA vs reciprocal time
d.1/CA vs time
D.
It is the time required to reduce the concentration of the reacting substance to half its initial value.
Half-life
The half-life of a material undergoing second-order decay is
inversely proportional to initial concentration
With increases in temperature, the rate constant obeying Arrhenius equation
Increases
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 ln k vs 1/T gives a straight line, with large slope for large E and small slope for small E.
A.
A batch reactor is characterized by
The variation in the extent of reaction and properties of the reaction mixture with time
A plug-flow reactor is characterized by
Presence of lateral mixing
Another name for STR (stirred tank reactor)
Backmix reactor
