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Keep in mind that the reaction can only occur if the particles collide with enough power in the right position.

The rate of reaction generally depends on four factors:

  1. Concentration
  2. Nature of reactants
  3. Temperature
  4. Catalysts

For gases, pressure is also a factor. Say we have 1L of a gas and we compress it to 0.5L. Decreasing the volume will increase the pressure, and with a lower volume with the same number of particles increases the molarity (M). And as a convention, increasing the molarity/concentration increases the rate of the reaction because there is more of a chance for particles to collide in a small space rather than in a large space.

Temperature also increases the rate of the reaction because it increases the kinetic energy of the particles, which will mean that more particles have the energy equal to or above the activation energy for the reaction to occur.

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