Question

1. Given the reaction 2A + 3B à C + 4D the reaction is zeroth order with respect to A and second order with respect to B. If the concentration of both A and B are doubled and the temperature remains unchanged, the rate of the reaction will increase by a factor of what? Why?

2. The kinetics of the reaction A+B à P were studied. The following data was collected. What is the rate law for this reaction? Why?

Expt |
[A] (M) |
[B] (M) |
Initial rate (M/s) |

1 |
0.273 |
0.763 |
2.83 |

2 |
0.273 |
1.526 |
2.83 |

3 |
0.819 |
0.763 |
25.47 |

Answer #1

1) with respect to A reaction is zero order.

with respect to B second order.

so by doule the concentration of A rate will not change.

by double the concentration of B rate increased by 4 times.

2) with respect to A reaction is second order

with respect to B reaction is zero order

**rate = K [A] ^{2}**

^{reaction is zero order with respect to B. so it is
excluded in rate law.}

when concentration of A increases 3 times reaction increases 9 times so second order with respect to A

Consider the reaction
2A+3B-> C +4D
You mix 500ml of 1.0M A, and 500ml of 1.4 M B. At equilibrium,
you detect C to have a concentration of 0.218M. What is the
equilibrium constant for this reaction?

2A → B + C
The above reaction is run and found to follow first order
kinetics with a rate constant of 1.30 x 10-3
sec-1. If the initial concentration of A is 1.56 M, what
is the concentration after 133 seconds?
2A → B + C
The above reaction is run and found to follow zero order
kinetics with a rate constant of 1.30 x 10-3
M•sec-1. If the initial concentration of A is 1.51 M,
what is the...

1.) 2A → B + C
The above reaction is run and found to follow second order
kinetics with a rate constant of 1.30 x 10-3
M-1sec-1. If the initial concentration of A
is 1.33 M, what is the concentration after 164 seconds?
2.) 2A → B + C
Two trials of the above reaction are run with the same initial
concentration of A. The first trial is performed at 25oC
and the second at 35oC. If the rate constant...

For the reaction :
2ClO2(g) + 2OH-(g) à
ClO3-(g) + ClO2-(aq) +
H2O(l) was studied at 25oC and the following
results were obtained.
[ClO2]o M
[OH-]o M
Initial rate, M/s
0.0500
0.100
5.75 x 10-2
0.100
0.100
2.30 x 10-1
0.100
0.0500
1.15 x 10-1
a) Calculate the order of reaction with respect to
ClO2 and OH-
b) Calculate the rate constant for the reaction
c) Write the rate law of the reaction.

The following is known about the reaction below:
Chemical reaction: 2A-->2B
The order of A is second order
If you start out with 2.75 M of A, after 5 minutes you will have
2.00M
From these facts, determine:
a) the rate law constant, K
b) the first half life
c) from time 0, how long will it take to reach 25% of the
original concentration of A
d) what is the concentration of A after 10 minutes?

1.)A reaction in which A, B, and C react to form products is
zero order in A, one-half order in B, and second order in C.
By what factor does the reaction rate change if the
concentrations of A is doubled?
By what factor does the reaction rate change if the
concentrations of B is doubled?
By what factor does the reaction rate change if the
concentrations of C is doubled?
Enter your answers numerically to two significant figures.
2.)...

a) The reaction A(aq) → B(aq) is a first order reaction with
respect to A(aq). The concentration of A(aq) is reduced from 0.892
M to 0.505 M in 3.05 minutes. What is the half-life, in seconds, of
this reaction?
b) The reaction A(aq) → 2 B(aq) is a second order reaction with
respect to A(aq). Its activation energy is 49.5 kJ/mol. When the
concentration of A(aq) is 0.100 M and the temperature is
25.0oC, the rate of reaction is 0.333...

A second order reaction, A>3B+C, has a rate constant of
1.37*10^-2M^-1s^-1. What will be the concentration of B after
50.0s, if [A]initial=0.250M, [B]initial=0.164 and
[C]initial=0.51.

Given a reaction between an organic molecule, denoted as A, and
NaSH, we observe the following observations. Using the
observations, write a rate law for the reaction.
(a) The rate triples when the concentration of [A] is tripled
and the concentration of [NaSH] is held constant.
(b) The rate is decreased when the concentration of [A] is
doubled and the concentration of [NaSH] is cut by a factor of
3.
(c) The rate doubles when the concentration of [A] is...

Be sure to answer all parts. The reaction 2A → B is second order
in A with a rate constant of 27.9 M−1 · s−1 at 25°C. (a) Starting
with [A]0 = 0.00737 M, how long will it take for the concentration
of A to drop to 0.00180 M? s (b) Calculate the half-life of the
reaction for [A]0 = 0.00737M. s (c) Calculate the half-life of the
reaction for [A]0 = 0.00207 M. s

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