Practice Meaning Of The Pre-exponential Factor A (3.5.2) - Unit 6: Chemical Kinetics

Practice: Meaning of the Pre-Exponential Factor A

Lesson 3.5.2Unit 6: Chemical Kinetics

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6 sample questions

Question 1.
What does the pre-exponential factor A represent in the Arrhenius equation?
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Think about the conditions under which A is considered.
Question 2.
In which range does A typically vary for simple bimolecular reactions?
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What does a higher value for A indicate about collisions?
3Question 3.
What does the pre-exponential factor A indicate about collisions?
- It indicates the speed of the reaction
- It reflects the frequency of effective collisions
- It is a measure of temperature effect
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Think about A in the context of molecular interactions.
4Question 4.
True or False: A is always equal to or greater than 1.
- True
- False
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Consider how molecular orientation affects collisions.
Question 5.
Consider a reaction that proceeds at a slow rate with a pre-exponential factor A = 10^5 and an activation energy Ea = 50 kJ/mol. Estimate the rate constant k at 300 K and discuss the implications.
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Make sure to convert Ea accurately to J/mol.
Question 6.
A reaction has A = 10^12 and Ea = 75 kJ/mol. Compare the rate of this reaction at 300 K with another where A = 10^9 and Ea = 70 kJ/mol, and evaluate which reaction is faster.
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Focus on how both factors contribute to the rate constants calculated.

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