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<p><a href="page.php?w=Image%3AMolecular-collisions.jpg">thumb</a><b>Collision theory</b> is a principle of <a href="page.php?w=chemistry">chemistry</a> used to predict the rates of <a href="page.php?w=chemical_reaction">chemical reaction</a>s. It states that when suitable particles of the <a href="page.php?w=Reagent">reactant</a>  hit each other with the correct orientation, only a certain amount of collisions result in a perceptible or notable change; these successful changes are called successful collisions. The successful collisions must have</p><p>
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