Free Printable 9.0 REACTION KINETICS

1.

Which of the following is a unit of rate of reaction?

a)

s^-1

b)

Ms^-1

c)

M

d)

M^-1s^-1

2.

For the reaction below, which of the following is the correct differential rate equation?

NH₃(g) + O₂(g) → NO(g) + H₂O(g)

a)

$rate\ =\ -\frac{\text{d}\left[NH_3\right]}{\text{d}t}=-\frac{\text{d}\left[O_2\right]}{\text{d}t}=\frac{\text{d}\left[NO\right]}{\text{d}t}=\frac{\text{d}\left[H_2O\right]}{\text{d}t}$

b)

$rate\ =\ -\frac{1}{2}\frac{\text{d}\left[NH_3\right]}{\text{d}t}=-\frac{1}{3}\frac{\text{d}\left[O_2\right]}{\text{d}t}=\frac{1}{4}\frac{\text{d}\left[NO\right]}{\text{d}t}=\frac{1}{2}\frac{\text{d}\left[H_2O\right]}{\text{d}t}$

c)

$rate\ =\ \frac{\text{d}\left[NH_3\right]}{\text{d}t}=\frac{\text{d}\left[O_2\right]}{\text{d}t}=-\frac{\text{d}\left[NO\right]}{\text{d}t}=-\frac{\text{d}\left[H_2O\right]}{\text{d}t}$

d)

$rate\ =\ -\frac{1}{4}\frac{\text{d}\left[NH_3\right]}{\text{d}t}=-\frac{1}{5}\frac{\text{d}\left[O_2\right]}{\text{d}t}=\frac{1}{4}\frac{\text{d}\left[NO\right]}{\text{d}t}=\frac{1}{6}\frac{\text{d}\left[H_2O\right]}{\text{d}t}$

3.

Write a balanced chemical equation based on the given differential rate equation:

$rate\ =\ -\frac{\text{d}\left[C_2H_6\right]}{\text{d}t}=\ -\frac{2}{7}\frac{\text{d}\left[O_2\right]}{\text{d}t}=\frac{1}{2}\frac{\text{d}\left[CO_2\right]}{\text{d}t}=\frac{1}{3}\ \frac{\text{d}\left[H_2O\right]}{\text{d}t}$

a)

C2H6 + $\frac{2}{7}$ O2 $\rightarrow$ $\frac{1}{2}$ CO2 + $\frac{1}{3}$ H2O

b)

$\frac{1}{2}$ CO2 + $\frac{1}{3}$ H2O $\rightarrow$ C2H6 + $\frac{2}{7}$ O2

c)

C2H6 + $\frac{7}{2}$ O2 $\rightarrow$ 2 CO2 + 3 H2O

d)

C2H6 +3 O2 $\rightarrow$ 2 CO2 + 3 H2O

4.

For the reaction:

4NH₃(g) + 5O₂(g) → 4 NO(g) + 6H₂O(g)

the rate of disappearance of oxygen is 0.020 M/s. What is the rate of formation of H₂O?

a)

0.03 Ms^-1

b)

0.02 Ms^-1

c)

0.017 Ms^-1

d)

0.024 Ms^-1

5.

State the order for the reaction.

a)

zero

b)

1st

c)

2nd

d)

3rd

6.

A reaction has the rate law: Rate = k [A][B].
What is the overall order of reaction?

a)

1st

b)

2nd

c)

3rd

d)

4th

7.

The rate law for the reaction 2NO_(g) + O_2(g) → 2NO_2(g) is first order in O₂ and third order overall. What is the rate law for the reaction?

a)

Rate = k [NO]²[O₂]²

b)

Rate = k [NO]¹[O₂]²

c)

Rate = k [NO]²[O₂]¹

d)

Rate = k [2NO]²[O₂]¹

8.

Determine the order of reaction with respect to concentration of A

a)

zero

b)

1st

c)

2nd

d)

3rd

9.

The catalyst alters the rate of a chemical reaction by,

a)

providing an alternative pathway with a lower Ea

b)

changing the products formed in the direction of the reaction

c)

providing a surface on which the molecules react

d)

increasing the frequencies of collisions between molecules

10.

Liz observes 2 reactions, A and B.

Reaction A is performed in a beaker placed on top of a hotplate.

Reaction B is is performed in a beaker placed within a container of ice.

Which of the following statements is true?

a)

Reaction A will react slower because the higher temperature will cause more collisions because the heat makes the molecules tired.

b)

Reaction A will react slower because the higher temperature will cause give the reactants higher speed and kinetic energy.

c)

Reaction B will react faster because the lower temperature causes the particles to move slower, allowing them to have more time to attach to one another.

d)

Reaction B will react slower because the lower temperature makes the particles move slower, resulting in less collisions.

9.0 REACTION KINETICS

Total questions: 10

Worksheet time: 7mins

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