## A in the Arrhenius Equation

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

Sarah Zhari 1D
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Joined: Sat Sep 14, 2019 12:16 am

### A in the Arrhenius Equation

What exactly is A in the Arrhenius equation? From the lecture, I know that it is the "frequency or pre-exponential factor" and it has something to do with particles colliding in the correct orientation, but what does this actually mean?

Lara Kristine Bacasen 1L
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### Re: A in the Arrhenius Equation

A in the Arrhenius Equation the frequency of collisions in the correct orientation.

Jasmine Fendi 1D
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### Re: A in the Arrhenius Equation

Some collisions occur with wrong orientations, so this tells how many occur in the correct orientation for the reaction to occur.

MinuChoi
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Joined: Wed Sep 18, 2019 12:15 am

### Re: A in the Arrhenius Equation

Note that the A constant is a unique value for each chemical reaction, like the k constant.

kristi le 2F
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### Re: A in the Arrhenius Equation

Since molecules need to collide at the correct orientation in order to react, orientation must be accounted for in the Arrhenius equation. This dependence on orientation leads to less molecules reacting than if we only accounted for collisions based on kinetic energy.

Sydney Pell 2E
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### Re: A in the Arrhenius Equation

How would you calculate the value of A to put in the Arrhenius equation? Would it need to be given to you?

Orrin Zhong 4G
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### Re: A in the Arrhenius Equation

"A" accounts for how often molecules collide in the proper orientation for the reaction to occur.

SimranSangha4I
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Joined: Sat Sep 14, 2019 12:17 am

### Re: A in the Arrhenius Equation

A is essentially the frequency of collisions in the proper orientation and it is unique.

Shail Avasthi 2C
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Joined: Fri Aug 30, 2019 12:17 am

### Re: A in the Arrhenius Equation

A is the fraction of molecular collisions that occur at the proper angle for a reaction to occur.

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