Question 1

A reaction is found to have an activation energy of 108 kJ/mol.If the rate constant for this reaction is 4.60 × 10-6 s-1 at 275 K,what is the rate constant at 366 K?

Accepted Answer

A) 12 s-1 
B) 1.7 s-1 
C) 0.58 s-1 
D) 5.4 × 10-5 s-1 
E) 1.9 × 10-4 s-1 
A) 12 s-1 
B) 1.7 s-1 
C) 0.58 s-1 
D) 5.4 × 10-5 s-1 
E) 1.9 × 10-4 s-1

Question 2

Match the following.
-Ea

Accepted Answer

A) frequency factor 
B) activation energy 
C) half-life 
D) rate constant 
E) reaction order 
A) frequency factor 
B) activation energy 
C) half-life 
D) rate constant 
E) reaction order

Question 3

What is the overall order of the following reaction,given the rate law?
Rate = k[X]3[Y]2

Accepted Answer

A) 3rd order 
B) 5th order 
C) 2nd order 
D) 1st order 
E) 6th order 
A) 3rd order 
B) 5th order 
C) 2nd order 
D) 1st order 
E) 6th order

Question 4

Given the following proposed mechanism,predict the rate law for the overall reaction.
A2 + 2B → 2AB (overall reaction)
Mechanism
A2 ⇌ 2A fast
A + B → AB slow

Accepted Answer

A) Rate = k[A][B] 
B) Rate = k[A2][B] 
C) Rate = k[A2][B]1/2 
D) Rate = k[A2] 
E) Rate = k [A2]1/2[B] 
A) Rate = k[A][B] 
B) Rate = k[A2][B] 
C) Rate = k[A2][B]1/2 
D) Rate = k[A2] 
E) Rate = k [A2]1/2[B]

Question 5

The rate of disappearance of HBr in the gas phase reaction
2HBr(g)→ H2(g)+ Br2(g)
Is 0.301 M s-1 at 150°C.The rate of appearance of Br2 is ________ M s-1.

Accepted Answer

A) 1.66 
B) 0.151 
C) 0.0906 
D) 0.602 
E) 0.549 
A) 1.66 
B) 0.151 
C) 0.0906 
D) 0.602 
E) 0.549

A reaction is found to have an activation energy of 108 kJ/mol.If the rate constant for this reaction is 4.60 × 10^-6 s^-1 at 275 K,what is the rate constant at 366 K?

Match the following. -E_a

What is the overall order of the following reaction,given the rate law? Rate = k[X]³[Y]²

Given the following proposed mechanism,predict the rate law for the overall reaction. A₂ + 2B → 2AB (overall reaction) Mechanism A₂ ⇌ 2A fast A + B → AB slow

The rate of disappearance of HBr in the gas phase reaction 2HBr(g)→ H₂(g)+ Br₂(g) Is 0.301 M s^-1 at 150°C.The rate of appearance of Br₂ is ________ M s^-1.

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Exam 13: Chemical Kinetics