Integrated Rate Laws

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

The rate law of any chemical reaction 

• must be determined experimentally

• can be deduced based on the stoichiometry of the reaction

• changes based on the condition of the experiment

• I don't know

Tags

NGSS.HS-PS1-5

A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________. 

• increase by a factor of 27 

• increase by a factor of 9 

• triple 

• decrease by a factor of the cube root of 3  

Tags

NGSS.HS-PS1-5

Which of the following procedures will allow the student to determine the rate constant, k , for the reaction?

• Plot ln [X] versus time and determine the magnitude of the slope.

• Plot 1/[X] versus time and determine the magnitude of

  the slope.

• Run another trial of the experiment with a different initial concentration, plot the data on the same graph, and see where the curves intersect.

Tags

NGSS.HS-PS1-5

In a chemical reaction, if the concentration of reactants is increased, what happens to the reaction rate?

• It decreases

• It increases

• It remains unchanged

• It initially increases, then decreases

Tags

NGSS.HS-PS1-5

Which of the following is the integrated rate law for a first-order reaction?

Tags

NGSS.HS-PS1-5

For a second-order reaction, the plot of which of the following versus time is linear?

What is the half-life of a first-order reaction dependent on?

• Initial concentration

• Rate constant

• Temperature

• Pressure

In a zero-order reaction, what happens to the rate of reaction as the concentration of reactant decreases?

• Increases

• Decreases

• Remains constant

• Fluctuates

Tags

NGSS.HS-PS1-5

Which of the following is true for a second-order reaction?

• Half-life is independent of initial concentration

• Half-life is directly proportional to initial concentration

• Half-life is inversely proportional to initial concentration

• Half-life is proportional to the square of initial concentration