On the other hand the chemical reaction so 4 h hso4 is 50 completed after about 10 4 s 1 2 3x10 4seconds reaction kinetics rate theory deals to a large extent with the factors which influence the reaction velocity take corrosion rusting of iron for example we all know that it. Module 7 theories of reaction rates lecture 32 theories of reaction rates i collision theory objectives after studying this lecture you will be able to do the following calculate collision frequency using kinetic theory distinguish between collision cross section and reaction cross section. Although the collision theory deals with gas phase reactions its concepts can also be applied to reactions that take place in solvents however the properties of the solvents for example solvent cage will affect the rate of reactions ultimately collision theory illustrates how reactions occur it can be used to approximate the rate . The rate of a reaction is the speed at which a chemical reaction happens if a reaction has a low rate that means the molecules combine at a slower speed than a reaction with a high rate some reactions take hundreds maybe even thousands of years while others can happen in less than one second
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