2025 LT 24 Remediation: Rate Law Graphs, Change in Conc.

We are studying the following reaction. We make a plot of ln[A] vs. time as the reaction proceeds. This plot turns out to be linear with a slope of -0.25. What is the rate law expression for this reaction?

2 A → 3 B

• rate = -0.25 s^-1ln[A]

• rate = 0.25 s^-1 ln[A]

• rate = 0.25 M^-1s^-1 [A]

• rate = 0.25 s^-1 [A]

Tags

NGSS.HS-PS1-5

What order would the reaction be given the graphs shown?

• zero order

• 1st order

• 2nd order

• cannot be determined

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NGSS.HS-PS1-5

What reaction order would the following graphs indicate?

• zero order

• 1st order

• 2nd order

• cannot be determined

Tags

NGSS.HS-PS1-5

What order of reaction is indicated by the graph?

• zero order

• 1st order

• 2nd order

• cannot be determined

Tags

NGSS.HS-PS1-5

Given the graphs shown, what was the beginning concentration of the substance?

• 0.01 M

• 100 M

• 4.6 M

• 1 M

Tags

NGSS.HS-PS1-5

What is the beginning concentration of the solution depicted in the graphs?

• 0.500 M
• -0.800 M

• .450 M

• 0 M

What is the half-life for the reaction depicted in the graphs?

• less than 10 sec

• somewhere from 10-20 sec

• somewhere from 20-30 sec

• somewhere from 30-40 sec

Tags

NGSS.HS-PS1-5

The rate constant for a second order reaction is 0.25 M^-1s^-1. If the initial concentration of the reactant is 0.45 M, how long does it take for the concentration to decrease to 0.15 M?

• 1.2 sec

• 4.39 sec

• 8.75 sec

• 17.8 sec

Tags

NGSS.HS-PS1-5

A reaction is second order with a rate constant equal to 0.0456 M^-1 min^-1 under certain conditions. If the initial concentration is 0.525 M, what is the concentration remaining after 5.00 min?

• 0.469 M
• 0.753 M

• 0.468 M
• 1.52 M

Tags

NGSS.HS-PS1-5

A compound decomposes by a first-order process. If 22.5% decomposes in 45 minutes, what is the rate constant?

• .00566
• 0.0331

• 11.5

• 0.50

Tags

NGSS.HS-PS1-5