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Rates of reactions

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Harvey Buckle

on 3 November 2017

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Transcript of Rates of reactions

3rd November 2017
Rates of reactions
SL/HL To know the meaning of reaction rate
SL/HL To know how to measure reaction rate
SL/HL To demonstrate this witha practical
(The chances of all this happening if your reaction needed a collision involving more than 2 particles are remote. All three (or more) particles would have to arrive at exactly the same point in space at the same time, with everything lined up exactly right, and having enough energy to react. That's not likely to happen very often!)
Ea Reaction profile
Rates of reaction
If you have a situation involving two species they can only react together if they come into contact with each other. They first have to collide, and then they may react.
Why "may react"? It isn't enough for the two species to collide - they have to collide the right way around, and they have to collide with enough energy for bonds to break.
Energy and activation energy
Even if the species are orientated properly, you still won't get a reaction unless the particles collide with a certain minimum energy called the activation energy of the reaction.

Activation energy is the minimum energy required before a reaction can occur. You can show this on an energy profile for the reaction. For a simple over-all exothermic reaction, the energy profile looks like this:

In any collision involving unsymmetrical species, you would expect that the way they hit each other will be important in deciding whether or not a reaction happens.
Measuring the rate of a reaction
a. Temperature
b. Amount of reactants
c. Amount of product
d. Light produced
e. Mass
f. pH
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