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Use Kinetic Molecular Theory to explain how temperature affects the rates of chemical reactions. Be detailed in your explanation.

Question

Use Kinetic Molecular Theory to explain how temperature affects the rates of chemical reactions. Be detailed in your explanation.

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Solution

The Kinetic Molecular Theory (KMT) is a simple microscopic model that effectively explains the gas laws (Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's law) in terms of the following postulates:

  1. Gases are made up of particles with volumes that are negligible compared to the container volume.
  2. Gas atoms or molecules exhibit no intermolecular attractions or repulsions.
  3. Gas particles are in continuous, random motion, undergoing collisions with each other and the container walls.
  4. Collisions between gas particles are elastic, meaning that there is conservation of both momentum and kinetic energy.
  5. The average kinetic energy of gas particles is directly proportional to the absolute temperature of the gas, and all gases at a given temperature have the same average kinetic energy.

Now, let's use these principles to explain how temperature affects the rates of chemical reactions.

  1. Increase in kinetic energy: According to the KMT, an increase in temperature leads to an increase in the kinetic energy of the particles. This means that the particles move faster.

  2. More collisions: As the particles move faster, they collide more frequently. In the context of a chemical reaction, these collisions can be between reactant molecules.

  3. More effective collisions: Not all collisions lead to a reaction. Only those collisions that have enough energy to break the bonds in the reactant molecules (the activation energy) and that occur with the correct orientation will lead to a reaction. As the temperature increases, not only are there more collisions, but a greater proportion of the collisions have enough energy to overcome the activation energy.

  4. Increased reaction rate: As a result of more frequent and more effective collisions, the rate of the reaction increases.

In conclusion, according to the Kinetic Molecular Theory, an increase in temperature leads to an increase in the kinetic energy of the particles, which results in more frequent and more effective collisions, and thus an increased reaction rate.

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