Collision Theory's Rate-Collision Proportionality
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Collision theory holds that a reaction's rate is proportional to the rate at which its reactant particles collide.
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Raising a gas's concentration packs more particles into the same volume, increasing how often they collide and how fast they react.
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Concluding that any collision reacts, so rate should equal collision frequency, is wrong — most collisions fail from bad orientation or insufficient energy.