9.0 REACTION KINETICS

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

• s^-1

• Ms^-1

• M

• M^-1s^-1

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

NH₃(g) + O₂(g) → NO(g) + H₂O(g)

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

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

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

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

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

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

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

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

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

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

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?

• 0.03 Ms^-1

• 0.02 Ms^-1

• 0.017 Ms^-1

• 0.024 Ms^-1

Tags

NGSS.HS-PS1-7

State the order for the reaction.

• zero
• 1st
• 2nd
• 3rd

Tags

NGSS.HS-PS1-5

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

• 1st
• 2nd
• 3rd
• 4th

Tags

NGSS.HS-PS1-5

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?

• Rate = k [NO]²[O₂]²
• Rate = k [NO]¹[O₂]²
• Rate = k [NO]²[O₂]¹
• Rate = k [2NO]²[O₂]¹

Tags

NGSS.HS-PS1-5

Determine the order of reaction with respect to concentration of A

• zero
• 1st
• 2nd
• 3rd

Tags

NGSS.HS-PS1-5

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

Tags

NGSS.HS-PS1-4

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?

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

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

• 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.

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

Tags

NGSS.HS-PS1-5