Review Collision Theory and Rate Laws

Match the following

• change in [A] over change in t

• First order reaction

• independent variable is 1/[A]

• instantaneous rate

• horizontal line on a rate vs time graph

• Second order reaction

• k=1/s

• Zero order reaction

• data does not include rate

• Integrated Rate Law

Tags

NGSS.HS-PS1-5

Match the following

• plot is [A] vs t

• instantaneous rate

• plot is 1/[A] vs t

• Initial Rate Law

• plot is ln[A] vs t

• First order reaction

• data includes rate and concentration

• Second order reaction

• negative because of decreasing [A]

• Zero order equation

Tags

NGSS.HS-PS1-5

Match the following

• k=M^-1s^-1

• Second order rate law

• [A] does not affect rate

• First order process

• rate=k[B]²

• Second order process

• concentration changes the same as rate

• Zero order process

• only integrated line with a +k

• 2nd order linear equation

Tags

NGSS.HS-PS1-5

Match the following

• rate=k

• Zero order rate law

• rate=k[A]

• First order rate law

• [A]_t = -kt + [A]₀

• Second order integrated rate law line equation

• 1/[A]_t = kt + 1/[A]_t

• Zero order integrated rate law line equation

• ln[A]_t = -kt ln[A]₀

• First order integrated rate law line equation

Tags

NGSS.HS-PS1-5

Match the following

• False

• The constant k, used in the rate law, always has moles as part of it's units.

• True

• Rate laws are determined from reactant concentrations.

• False

• Initial rates rate determination requires experimental data.

• True

• Rate laws are used to describe how reactants are used up and products are formed.

• True

• Integrated rate law curves always have a positive slope.

Tags

NGSS.HS-PS1-5

Organize these options into the appropriate categories

Groups:

(a) First Order

,

(b) Second Order

,

(c) Zero Order

• k=1/Ms

• rate=k[A]

• dependent variable: 1/[A] for integrated rate law

• k=M/s

• dependent variable: ln[A] for integrated rate law

• dependent variable: [A} for integrated rate law

• rate=k

• k=1/s

• rate=k[A][B]

Tags

NGSS.HS-PS1-5

The rate expression for a particular reaction is Rate = k[A][B]².

If the initial concentration of B is increased from 0.1 M to 0.3 M, the initial rate will increase by which of the following factors?

• 3

• 27

• 4

• 6

• 9

Tags

NGSS.HS-PS1-5

For the reaction: 2HI → 2H₂ + I₂

If HI is first order, which of the following will yield a negative exponential plot?

• log [HI] vs time

• 1/[HI] vs time

• [HI]² vs time

• [HI] vs time

• ln[HI] vs time

The following data were measured for the reaction BF₃(g) + NH₃(g) —> F₃BNH₃(g)

What is the rate law for the reaction?

• R=k[NH₃]

• R=k[BF₃]²[NH₃]

• R=k[BF₃][NH₃]

• R=k[BF₃][NH₃]²

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