Chemistry - Chem 9: Rates of reactions

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  • Created by: shcoool
  • Created on: 27-05-15 14:59
How may the rate of a reaction be found?
measuring the amount of a reactant used up or amount of product formed over time
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How do you find the rate of the reaction in a graph?
the gradient of amount of product against time graph
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If the one of the products is gas, how do you measure the rate of the reaction?
on a balance - mass loss, gas in a syringe - volume over time
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If one of the products is a solid, how do you measure the rate of the reaction?
the cloudiness over time
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name four factors that affect the rate of the reaction
temperature, concentration.pressure, presence of catalyst, surface are
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What is collision theory?
chemical reaction - two particles must collide and have enough energy to react.
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What is the activation energy?
minimum energy required to react
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increase temp
increase rate - more likely to have activation energy, more kinetic energy so move faster and collide more frquently
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increase concentration
increases frequency of collision so rate is increased
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decrease particle size
more surface area avaialbe to react with so increases rat eof collisions and rate
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add catalyst
provides lower activation energy so more likely to have it so reacts more often and rate is increased. not used up
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three examples of catalysts in industry and home
enxymes in washign powders to digest stains. zieglernatta to make polymers with specific properties. platinum in fuel cells which generate electricity
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Other cards in this set

Card 2

Front

How do you find the rate of the reaction in a graph?

Back

the gradient of amount of product against time graph

Card 3

Front

If the one of the products is gas, how do you measure the rate of the reaction?

Back

Preview of the front of card 3

Card 4

Front

If one of the products is a solid, how do you measure the rate of the reaction?

Back

Preview of the front of card 4

Card 5

Front

name four factors that affect the rate of the reaction

Back

Preview of the front of card 5
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