5.3 P.1

X → products

Pure substance X decomposes according to the equation above. Which of the following graphs indicates that the rate of decomposition is second order in X ?

• 
• 
• 
• 

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

Which of the following best identifies the rate constant k

for the reaction based on the information in the plot of ln[H₂O₂] versus time (t) ?

• k = ln[H₂O₂] at t=0s

• k = −(slope of plot)

• k = ln[H₂O₂] at t=500s

Tags

NGSS.HS-PS1-5

What is the rate constant for a first-order reaction with an initial reactant concentration of .300 mol/L if, after 200 s, the concentration is .200 mol/L?

• .005 s^-1

• .002 s^-1

• .001 s^-1

• .006 s^-1

Tags

NGSS.HS-PS1-5

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

Tags

NGSS.HS-PS1-5

The graphs shown in the diagram indicate that reactant A is ________________ order.

• zero

• first

• second

Given the following differential rate late, what be the units for k?

Rate = k[A][B]²

• 1/M s

• 1/M² s

• 1/M³ s

• 1/s

What is the half-life of a first-order reaction if the rate constant k is 0.693 s^-1?

• 2 s

• 0.5 s

• 1 s

• 0.693 s

For a second-order reaction with the rate law Rate = k[A]², what will be the effect on the rate if the concentration of A is doubled?

• The rate will quadruple.

• The rate will remain the same.

• The rate will halve.

• The rate will double.

Tags

NGSS.HS-PS1-5

Which of the following graphs would indicate a zero-order reaction?

• A plot of [A] versus time with an exponential decrease.

• A plot of 1/[A] versus time with a linear increase.

• A plot of ln[A] versus time with a linear decrease.

• A plot of [A] versus time with a linear decrease.