Question 1

The activation energy can be determined by

Accepted Answer

multiplying the slope by R and changing the sign

Answer

finding the Y intercept

Answer

multiplying the slope by R

Answer

dividing the slope by R and changing the sign

Question 2

In the Arrhenius equation, the variables are

Accepted Answer

k = rate constant,  T= temperature,  A = frequency factor

Answer

k = rate constant,  T= time,  A = activation energy

Answer

K = equilibrium constant,  T = time,  A = frequency factor

Answer

K = equilibrium constant,  T= temperature,  A = activation energy

Question 3

In the potential energy profile, which step in the mechanism is the rate determining step?

Accepted Answer

1st step

Answer

impossible to tell without the rate law

Answer

2nd step

Answer

3rd step

Question 4

What is the relationship between rate constant, k and temperature?

Accepted Answer

rate constant increases exponentially with temperature

Answer

rate constant increases linearly with temperature

Answer

temperature will not affect the rate constant

Answer

rate constant is inversely proportional to temperature

Question 5

What must be true of a reactant  that is zero order in a reaction?

Accepted Answer

it is not involved in the rate determining step

Answer

it must be a solid and therefore does not have a concentration

Answer

increasing its concentration decreases the reaction rate

Answer

it is really acting as as a catalyst for the reaction

Question 6

The catalyst in this reaction is

Accepted Answer

BC

Answer

AB

Answer

AD

Answer

C

Question 7

The intermediate(s) in this reaction is/are

Accepted Answer

B,  C,  and AB

Answer

B and C only

Answer

AB,  BC   and B

Answer

AB  and C only

Question 8

What is the overall rate law for this reaction?

Accepted Answer

rate = k[N$_2$O$_5$]

Answer

rate = k[NO$_2$][NO$_3$]

Answer

rate = k[N$_2$O$_5$]  [NO$_2$] $^{-1}$

Answer

rate = k [N$_2$O$_5$]$^2$

Question 9

which of these is an acceptable mechanism for the overall reaction?

Accepted Answer

mechanism I

Answer

mechanism III

Answer

all three could be possible mechanisms

Answer

mechanism II

Question 10

The frequency factor A in the Arrhenius equation, is associated with which of these aspects of collision theory?

Accepted Answer

the fraction of particles that have the correct orientation for a successful collision

Answer

the fraction of particles that collide with sufficient energy

Answer

the number of collisions per unit time

Answer

all of these

Question 11

Which of these is true regarding an S_N1 reaction between (CH₃)₃CBr + OH^-----> (CH₃)₃COH + Br^- ?

Accepted Answer

the rate determining step is unimolecular

Answer

the rate law is rate = k[(CH₃)₃CBr][OH^-]

Answer

the halogenoalkane is a primary one

Answer

increasing the concentration of hydroxide ion doubles the rate

Question 12

At 550^oC, the rate constant for a reaction is 1.1 L mol^-1s^-1, and at 625^oC the rate constant is 6.4 L mol^-1s^{^-1}; what is the activation energy for this reaction?

Accepted Answer

Answer

1.4 x 10⁵KJ/mol

Answer

6.7 x 10⁴J/mol

Answer

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