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RATE OF REACTION

Name:W.M.H.G.T.C.K.Weerakoon Reg_no:13/AS/134 Index no: EP1801

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CONTENT•Definitions•Rate Law•Factors affecting Rate of Reaction

-Concentration-Pressure-Temperature-Catalysts

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DEFINITIONS•Reaction-Transformation of chemical substances

from one to another.•Rate of Reaction- The rate of change in the concentration of reactant or The rate of change in the concentration of products

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•Therefore,

or

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General equation,According to definitions,

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e.g.:

rate=

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Rate Law

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•A relationship between Rate of Reaction and Concentration of Reactants•Assumption:-reaction in a fixed temperature

rate=-Rate constant,-Reaction order

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FACTORS AFFECTING

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REACTION RATE

CONCENTRATION TEMPERATURE

PRESSURE

CATALYSTS• Underling

principle running is COLISSION THEORY

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Concentration….

• Low concentration leads few collisions and low speed in reaction rate.

• High concentration leads more collisions and high speed in reaction rate

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Temperature….• Low temperature and low average

kinetic energy, less successful collisions, low rate of reaction

• High temperature and high average kinetic energy, high successful collisions, high rate of reaction

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PRESSURE….• Specially affects on gases

• High pressure, high molecule density, high effective collisions and high rate of reaction.

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CATALYSTS….•Catalysts-Substances that increase rate of

reaction•Catalysts lower the activation energy and then high successful collisions•If to lower the rate of reactions INHIBITORS could be used

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