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TitleSpeed of Reaction Summary
TagsCatalysis Reaction Rate Chemical Reactions Gases
File Size236.8 KB
Total Pages3
Document Text Contents
Page 2

2012 Edited by Mr Chong, Singapore


2


increases the speed of reaction because:


 The area of contact between the reacting particles increases, the number of
effective collisions per unit time also increases.


7. Concentration of reactant:

 An increase in concentration of the reactants increases the speed of reaction
because:


 When the concentration of a reactant is increased, there are more reacting

particles per unit volume.

 The frequency of collisions between the reacting particles thus increases.


 This leads to an increase in the number of effective collisions per unit

time.


8. Pressure of reactant (for gases only):
 An increase in pressure of the reactants increases the speed of the reaction

because:


 When the pressure of a gas is increased, there are more gas particles per
unit volume.


 The frequency of collisions between the gas particles thus increases.



 This leads to an increase in the number of effective collisions per unit

time.




Key Concepts:


1. A catalyst is a substance that changes the speed of the reaction but it remains chemically
unchanged at the end of the reaction.


2. Catalysts provide an alternative pathway for reactions to occur. In the catalyzed pathway,

less energy is required for the reaction to occur, so the activation energy is lowered.

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