8 Matching Annotations
- Sep 2022
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chem.libretexts.org chem.libretexts.org
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The frequency factor determines the maximum rate of collisions, is a function of particle size, concentration and the rate of diffusion. The steric factor accounts for orientation, in that not all collisions have the correct orientation to result in a reaction, (see video 14.6.214.6.2\PageIndex{2}). The rule of thumb is that the more symmetric a molecule the larger the steric factor (a value of 1 means there is no effect, and the pre-exponential is determined by the collision frequency) and the more complicated a molecule, the smaller the steric factor (which is less than one), because only a fraction of the collisions have the correct orientation.
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Arrhenius
e ea/rt - molecules that have enough energy to break activation barrier.
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components
high temperature - you have 1/ infinity
e ^0 is 1
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exponential
Endothermic break a bond ------- Exothermic Makes a bond
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mathematically
AE = ^ea/rt R- 8.314 mol/k
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That
Activataion energy. ENrgy needed to break bonds.K ALWAYS POSITIVE
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where R has units of 8.314J/mol-K
This is a constant of and its units used in the Arrhenius theory.
Tags
- Exam 2
- activation energy
- Constant
- Equation
- Endothermic to exothermic
- arhennius equation
- Pre-exponential
Annotators
URL
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- Feb 2021
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chem.libretexts.org chem.libretexts.org
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We know that the energy change of a reaction can be endothermic or exothermic.
Is kinetic energy exothermic since it’s moving?
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