Arrhenius Equation and Chemical Kinetics Quiz

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What is the key factor that limits the molecularity of a reaction to never exceed three?

Decreased rate of reactions with more than three molecules.
Limited chances for molecules to undergo effective collisions. (correct)
High energy barrier for reactions with more than three molecules.
Complexity of higher order reactions.

In a multistep reaction, how is the molecularity determined?

By looking at the slowest step only.
Only in the first step.
By combining the molecularity of all steps.
Separately in each step. (correct)

In a complex reaction, what is the slowest step called?

Rate limiting step
Fastest step
First order step
Rate determining step (correct)

What is the overall molecularity of a complex reaction equal to?

Molecularity of the slowest step (D) Signup and view all the answers

If a reaction has a molecularity of 1, what is it called?

Unimolecular (D) Signup and view all the answers

What does the order of reaction define?

Number of reactants determining the rate of reaction. (D) Signup and view all the answers

If a reaction is bimolecular, what is its molecularity?

2 (D) Signup and view all the answers

Rate constant units for a second-order reaction are:

$mol L^{n} s^{-1}$ (D) Signup and view all the answers

Rate constant units for a third-order reaction are:

$mol^{-2} L^{2n-1} s^{-1}$ (C) Signup and view all the answers

What does the Arrhenius equation define?

Relationship between reaction rate and activation energy (B) Signup and view all the answers

In the Van’t Hoff differential method, what does 'n' represent?

Change in activation energy with temperature (D) Signup and view all the answers

For a pseudo-unimolecular reaction, what does 'V∞' refer to?

Volume at infinity (C) Signup and view all the answers

What is the relationship between activation energy (Ea) and threshold energy?

Ea = Threshold energy - Potential energy of reactants (B) Signup and view all the answers

Which equation describes the relationship between two different temperatures (T1 and T2) and activation energy (Ea)?

Ea = 2.303R log10(T2/T1) (D) Signup and view all the answers

What is the formula for the rate constant (k) in the Arrhenius equation?

k = Ae or -Ea/RT log (D) Signup and view all the answers

What is the half-life method used for in chemical kinetics?

Comparing half-lives of reactions with different orders (C) Signup and view all the answers

'Order' in chemical kinetics refers to what aspect of a reaction?

[A]m [B]n in the rate equation (A) Signup and view all the answers

For a second-order reaction, what does 'dx ∝ [A]1/dt' represent?

[A] concentration over time for a second-order reaction (B) Signup and view all the answers

What is the formula for calculating 'n' in the Van’t Hoff differential method?

Change in activation energy with temperature over difference in concentration logs (B) Signup and view all the answers