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Page 1

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Factors affecting the rate of reaction

1. Temperature

Page 2

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Gradient is different
Amount of product formed is the same

Temperature low

Temperature high ­
particles collide with more energy

The higher the
temperature the more energy the particle have, they
collide with more force so more successful collisions
so faster reaction

2. Concentration

Page 3

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Gradient changes
Amount produced changes

Concentration of acid low

Concentration of
acid higher ­ more chance of particles colliding

The higher the
concentration the more particles, so there are more
successful collisions so faster reaction
(do not mix up with temperature, particle energy
remains the same)
3. Surface area


Page 4

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The higher the
surface area the more surface there is for collisions
so the more successful collisions so the faster the
Surface area of zinc low

Surface area of zinc
high ­ more zinc exposed to collisions

4. Using a catalyst

Page 5

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Hydrogen peroxide
decomposes very

Hydrogen peroxide water + oxygen

But when a catalyst is added this decomposition is
much faster

An enzyme in the liver has the same effect; enzymes
are natural (biological) catalysts

Page 6

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Most catalysts are specifics to one reaction only
The higher the surface area of the catalyst the
faster the reaction


An explosion is when a very fast reaction releases a huge
amount of gas
Places where there are large amounts of dust (e.g. flour,
sulphur or coal dust) are…

Page 7

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Experiment with acid and marble chips

Time (seconds) Volume of CO (cm )
15 16
30 25
45 44
60 86
75 95
90 107

Page 8

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y = 10 = 1.428571429 = 1.4
x 7
1.4cm of CO per second


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