Thursday, 16 May 2013
4.18 describe the effects of changes in surface area of a solid, concentration of solutions, pressure of gases, temperature and the use of a catalyst on the rate of a reaction
Higher temperature, more surface area, higher concentration, higher pressure and use of a catalyst all make a reaction faster.
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ReplyDeletecould you say something about the particle collision theory on this please?
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ReplyDeleteIncrease in concentration =
ReplyDelete+Increase in rate of reaction
+more particles in a given volume
+Particles collide more often
+therefore more successful collisions per second.
Increase in temperature=
+Increase in rate of reaction
+Particles have more energy
+therefore more collisions have the required activation energy
+which results in more successful collisions per second
Increase in surface area=
+Increase in rate of reaction
+More particles in contact with the other reactant
+Particles collide more often
+which results in more successful collisions per second
A CATALYST provides an alternative pathway for the reaction to start, which requires a low activation energy.
(Activation energy is the amount of energy required for a reaction to occur)
Happy revising people!!