988535
Description
Mind Map by Chloe.Sharland, updated more than 1 year ago
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Created by Chloe.Sharland
almost 11 years ago
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C3c - Rate of
Reactions 3
- Surface area of Solid Reactants
- Powdered solids react faster than lumps of the same reactant. A
powdered reagent has a much larger surface area compared to
lumps of the same material. There are more particles available on
the surface for the other particles to collide with. The greater the
number of particles exposed, the greater the chance of them
colliding together, which increases the reaction.
- Gas and fine dust have the
largest surface area of all and
sometimes they react so fast it
leads to an explosion. An
explosion is a very fast chemical
reaction when huge volumes of
gas are made. Other materials
that can explode are dynamite
and TNT.
- Factories that handle powders such as flour, custard powder or
sulphur have to be very careful because the dust of these materials
can mix with air and could cause an explosion if there is a spark. The
factories have to prevent dust being produced and take precautions
to ensure no spark is made that would ignite a dust- air mix.
- Powdered solids react faster than lumps of the same reactant. A
powdered reagent has a much larger surface area compared to
lumps of the same material. There are more particles available on
the surface for the other particles to collide with. The greater the
number of particles exposed, the greater the chance of them
colliding together, which increases the reaction.
- Using a Catalyst
- A catalyst is a substance that increases the rate of reaction and is unchanged at the end of the
reaction. Catalysts are very useful materials, as only a small amount of catalyst is needed to
speed up the reaction of large amounts of reactant.
- Catalysts are most effective when they
have a large surface area. The greater
the number of particles exposed, the
greater the chance of them colliding
together, which means more effective
collisions per second.
- You may be asked to sketch a graph
showing the effects of using a catalyst
in an experiment. One line without a
catalyst, linear line, and one line
without a catalyst.
- Enter text here
- A catalyst is a substance that increases the rate of reaction and is unchanged at the end of the
reaction. Catalysts are very useful materials, as only a small amount of catalyst is needed to
speed up the reaction of large amounts of reactant.
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