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7 Cards in this Set

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What the does the area under the boltzman distribution curved show?

Number of molecules

What happens to the curve when tempreture decreases (boltzman)

The peak shifts to the left and the trough becomes higher, showing that more molecules now have less kinetic energy and more molecules are below the required E a -low rate of reaction.

How does increasing temperature/pressure effect boltzman distribution

Curve shifts to the right and the number of molecules above the activation energy is increased. If the number of particles has increased at this energy level then the number of particles at lower energy decreases and so the curve lowers here.

How do catalyst change a rate of reaction?

Provide a alternative pathway (through Intermediates)


Lower activation energy so more particles can react


Catalysts are reused


Improve yield of products


Faster rate of reaction


Suggest 3 advantages of catalyst use?

Faster reaction(larger yield more quick)


Lowers cost


Less energy required

How biological catalysts differ from chemical catalysts?

Biological =


Specific to one substrate


Enzymes are protiens

State le chatliers principle?

When a system in dynamic equilibrium is subject to change. The position of the equilibrium will shift on order to minimise the change.