Advertisements
Advertisements
प्रश्न
Define half life of a reaction.
उत्तर
The half life of reaction is the time required for the reactant concentration to fall to one half of its initial value.
APPEARS IN
संबंधित प्रश्न
Answer the following in one or two sentences.
What are the units for rate constants for zero-order and second-order reactions if time is expressed in seconds and concentration of reactants in mol/L?
Answer the following in one or two sentences.
Write the relationships between rate constant and half-life of the first order and zeroth-order reactions.
What are pseudo-first-order reactions?
Solve
The half-life of a first-order reaction is 1.7 hours. How long will it take for 20% of the reactant to react?
Time required for 100% completion of a zero order reaction is _______.
The rate of catalysed reaction is large than the uncatalysed reaction as _______.
Write a mathematical expression for integrated rate law for zero-order reaction.
Derive an integrated rate law expression for first order reaction: A → B + C
This reaction follows first-order kinetics. The rate constant at particular temperature is 2.303 × 10−2 hour−1. The initial concentration of cyclopropane is 0.25 M. What will be the concentration of cyclopropane after 1806 minutes? (log 2 = 0.3010)
Give two examples for zero order reaction.
A first order reaction is 40% complete in 50 minutes. Calculate the value of the rate constant. In what time will the reaction be 80% complete?
In a first order reaction, the concentration of the reactant is reduced to 25% in one hour. The half-life period of the reaction is ____________.
For first order reaction the slope of the graph of log10 [A]t Vs. time is equal to ____________.
The slope of a graph, log [A]t versus 't' for a first order reaction is −2.5 × 10−3 s−1. The rate constant for the reaction is ____________.
For a zero order reaction, the plot of [A]t vs t is linear. The slope of the line is equal to ____________.
The half-life of a first order reaction is 6.0 hour. How long will it take for the concentration of reactant to decrease from 0.4 M to 0.12 M?
A first order reaction is 50% completed in 16 minutes. The percentage of reactant that will react in 32 minutes is ____________.
A certain zero order reaction has rate constant 0.025 M s-1. What will be the concentration of reactant 'A' after 15 seconds, if initial concentration is 0.50 M?
Half-life of first-order reaction \[\ce{X -> Y + Z}\] is 3 minutes. What is the time required to reduce the concentration of 'X' by 90 % of it's initial concentration?
Rate constant for zero order reaction is 2 × 10-2 mol L-1 s-1. If the concentration of the reactant after 25 sec. is 0.5 M, what is the initial concentration of reactant?
For zero order reaction, when [A]t is plotted against time (t), the slope of the straight line obtained is equal to ______.
The expression to calculate time required for completion of zero order reaction is ______.
The integrated rate law is a direct relationship between time and ______
Obtain the expression for half-life and rate constant of the first-order reaction.
Which one of the following reactions is a true first-order reaction?
Which of the following is correct for a first-order reaction?
A radioactive isotope decayed to 17/32 of its original mass after 60 minutes. Find the half-life of this radioisotope.
What are integrated rate laws?
