WorksheetsPractice 1.0 Reaction Kinetics
Total questions: 23
Worksheet time: 2hrs 42mins
For the reaction;
A + 2B → C + 2D
the rate of disappearance of A is 2.6 x 10-2 Ms-1. What is the rate of disappearance of B?
6.5 x 10-3 Ms-1
1.3 x 10-2 Ms-1
2.6 x 10-2 Ms-1
5.2 x 10-2 Ms-1
If a reaction is described as a zero order with respect to reactant A, this means that
A is a catalyst in the reaction
A is not involved in the rate determining step
the value of the rate constant is independent of A
the rate of reaction is inversely proportional to the concentration of A
The reaction A + 2B → products was found to have the rate law, rate = k[A][B]2. Predict by what factor the rate of reaction will increase when the concentration of B is doubled and the concentration of A remained unchanged.
2
4
6
8
What is the unit for rate constant,K if rate law:
Rate = K [A]
s-1
M s-1
M-1 s-1
M-2 s-1
The first order rate constant for the decomposition of 0.5 M compound A at 100oC is 0.03 min-1. Calculate the half-life of A.
1.5 min
8.3 min
23.1 min
66.7 min
The catalyst alters the rate of a chemical reaction by,
providing an alternative pathway with a lower Ea
changing the products formed in the direction of the reaction
providing a surface on which the molecules react
increasing the frequencies of collisions between molecules
Which of the following plots will show a linear relationship for a second order reaction?
[A] vs time
1/[A] vs time
ln[A] vs time
[A]2 vs time
Given the following balanced equation :
2NO(g) + Cl2(g) → 2NOCl(g)
If the rate of disappearance of Cl2 is 4.84 x 10-2 Ms-1, what is the rate of disappearance of NO?
1.45 x 10-2 Ms-1
2.42 x 10-2 Ms-1
3.67 x 10-2 Ms-1
9.68 x 10-2 Ms-1
In the chemical reaction, the successful formation of products depends on the following factors EXCEPT:
The collisions between reacting molecules must be effective
The colliding molecules must approach each other in the right orientation
The energy of colliding molecules must be equal to or more than activation energy
A collision between molecules must produce sufficient energy to overcome the activation energy
Decreasing concentration has which of the following effects on reaction rate?
Increases reaction rate.
Has no effect on reaction rate.
Decreases reaction rate.
The rate expression for the reaction
X(g) + 2Y(g) → 3Z(g) is
rate = k[X]0 [Y]2
By which factor will the rate of reaction increase when the concentrations of X and Y are both increased by a factor of 3?
6
9
18
27
The collisions which bring about a chemical reaction are called:
Consistent collisions
Normal collisions
Effective collisions
The half-life of a reactant, t1/2, is the amount of time needed for a reactant concentration ......
to increase by three times original concentration.
increase by half of original concentration.
decrease by ten times original concentration.
decrease by half of original concentration.
The following integrated rate law could be used to find the the concentration of a ________________ order reactant at a certain time.
[A] = - kt + [A]0
zero
first
second
The t1/2 for the decomposition of hydrogen iodide, a second order reaction, is 253 seconds. Determine the rate constant if its initial concentration is 0.05 M.
0.08 M-1s-1
0.08 Ms-1
0.04 M-1s-1
0.04 Ms-1
The decomposition of a compound A into its products has a rate constant of 0.083 mol dm-3 min-1 at 380 K. How long will it take for the concentration of A to drop to 1.00 mol dm-3 if at t = 0.0 min [A] is 3.50 mol dm-3.
30.1 minutes
15.1 minutes
43.1 minutes
8.6 minutes
