Fast Reaction: High concentration of reactants, High temperature, High surface area - crush up reactants, Fast moving particles, Frequent collisions between reactants, High energy successful collisions, High number of collisions per second, Reactants collide in the right orientation, Slow Reaction: Low concentration of reactants, Low temperature, Low surface area - large chunks of reactants, Slow moving particles, Infrequent collisions between reactants, Low energy unsuccessful collisions, Low number of collisions per second, Reactants collide in the wrong orientation,

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