Recent questions and answers in Chemical Kinetics

Which of the following statement(s) is/are correct?

answered Jan 18, 2016 by meena.p

1 answer

which of the following is correct about half life period?

answered Jul 19, 2015 by sharmaaparna1

1 answer

The rate of reaction for A---> products is 10 mol.lit-1.min-1 at time t1=5minutes. what will be the rate at the time t2=10minutes

answered Jul 8, 2015 by sharmaaparna1

1 answer

For the reaction $A+B \rightarrow C+D$ , calculate the value of k for this reaction based on the following data collected in three different experiments:

answered Jul 25, 2014 by balaji.thirumalai

1 answer

The activation energy for a certain reaction is 76.7 kJ mol $^{-1}$ . How many times faster will the reaction occur at 50 $^\circ$ C compared to 0 $^\circ$ C?

answered Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant of a reaction at 32 $^\circ$ C is 0.055 s $^{-1}$ . If the frequency or pre-exponential factor is 1.2 $\times$ 10 $^{13}$ s $^{-1}$ , what is the activation energy?

answered Jul 25, 2014 by balaji.thirumalai

1 answer

Calculate the value of k for this reaction based on the following data collected in three different experiments:

answered Jul 25, 2014 by balaji.thirumalai

1 answer

If a temperature increase from 20 $^\circ$ C to 35 $^\circ$ C triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?

answered Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant (k) for a reaction was determined as a function of temperature. A plot of $ln\; k$ versus $\large\frac{1}{T}$ (in $K$ ) is linear and has a slope of $-1.01 \times 10^{4}\;K$ . Calculate the activation energy for the reaction.

answered Jul 25, 2014 by balaji.thirumalai

1 answer

A certain reaction is first order, and 540 s after initiation of the reaction, 32.5% of the reactant remains. At what time after initiation of the reaction of the reaction will 10% of the reactant remain?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

A certain first order reaction is 45% complete in 65 seconds. Determine the rate constant and the half-life for this process.

answered Jul 25, 2014 by balaji.thirumalai

1 answer

Calculate half-life for first-order reaction if 68% of a substance is reacted within 66 s.

answered Jul 25, 2014 by balaji.thirumalai

1 answer

What is the rate of a reaction if $[A]_o = 560\;M$ , $[B]_o = 0.2\;M$ , and 2nd order rate constant is $0.1\;M^{-1}s^{-1}$ ?

answered Jul 25, 2014 by balaji.thirumalai

1 answer

What is the concentration of $A$ at time $45\;s$ if $[A]_o = 1\;M$ , $[B]_o = 45\;M$ , and 2nd order rate constant is $0.6\;M^{-1}s^{-1}$ ?

answered Jul 25, 2014 by balaji.thirumalai

1 answer

If $[A] = 55\;M$ at $39s$ , $[A]_o = 99\;M$ , and $[B]_o = 1000\;M$ , what is the 2nd order reaction rate constant?

answered Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant for the 2nd order reaction shown below is $0.54 M^{–1}$ at 300 $^{\circ}$ C. How many seconds would it take for the concentration of NO $_s$ to decrease from $0.62\; M$ to $0.28\; M$ ?

answered Jul 24, 2014 by balaji.thirumalai

1 answer

The thermal decomposition of phosphine to phosphorus and hydrogen gas is a first order reaction, with a half-life of 35 s at 680 $^\circ$ C. Calculate the time required for 95% of phosphine to decompose.

answered Jul 24, 2014 by balaji.thirumalai

1 answer

The thermal decomposition of N $_2$ O $_5$ to form NO $_2$ and O $_2$ is a first order reaction. The rate constant for the reaction is $5.1x10^{–4}s^{-1}$ at $318^{\circ} K$ . Calculate the half-life of this reaction.

answered Jul 24, 2014 by balaji.thirumalai

1 answer

The following data was collected in three different experiments:

answered Jul 24, 2014 by balaji.thirumalai

1 answer

Calculate the value of k for this reaction based on the following data collected in three different experiments:

answered Jul 24, 2014 by balaji.thirumalai

1 answer

Consider the following reaction: $A + 3 B \rightarrow 2 C + 2 D$ . In one experiment, the rate of change of B was found to be $2.50 \times 10^{–4}\;M/s$ . What is the rate of change of C in this experiment?

answered Jul 24, 2014 by balaji.thirumalai

1 answer

A certain first order reaction proceeds through t first order kinetics. The half-life of the reaction is 180 s. What percent of the initial concentration remains after 900s?

answered Jul 24, 2014 by balaji.thirumalai

1 answer

The decomposition of $N_2O_5$ is given by the following equation: $2\; N_2O_5\; (g) \rightarrow 4 NO_2\;(g) + O_2\;(g)$ At an initial $[N_2O_5]_0 = 3.15\; M$ , the initial rate of reaction is $5.45 \times 10^{-5} \;M/s$ and when $[N_2O_5]_0 = 0.78\; M$ , the initial rate of reaction is $1.35 \times 10^{-5}\; M/s$ . What is the rate constant of this reaction?

answered Jul 24, 2014 by balaji.thirumalai

1 answer

The reaction $A \rightarrow \text{Products}$ is second order in $A$ . Initially $[A]_0 = 1.00 M$ and after $25 \; \text{mins}, \;[A] = 0.25\; M$ . What is the rate constant for this reaction?

answered Jul 24, 2014 by balaji.thirumalai

1 answer

From the integrated rate law for a first order reaction, $[A] = [A]_0\; e^{-kt}$ . Suppose rate constant, $k = 2.95 X 10^{-3} s^{-1}$ , What percent of $A$ remains after $150 \;s$ ?

answered Jul 24, 2014 by balaji.thirumalai

1 answer

An elementary reaction, $2 A + C \rightarrow D$ , is second order in $A$ and first order in $C$ . The rate of this reaction is $2.5 \times 10 ^{-1}1\; M/s$ when the concentrations of $A$ and $C$ are all $3.00\; mM$ . What is the rate constant for the reaction?

answered Jul 24, 2014 by balaji.thirumalai

1 answer