Rates of Reaction

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  • Created by: Tasha.L
  • Created on: 13-04-16 17:29
How does increasing the concentration increase the rate of reaction?
Increasing the concentration means there is a greater number of molecules within a given volume. Therefore, there are more successful collisions per second, and so the rate of reaction increases.
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How does increasing the pressure increase the rate of reaction?
Increasing the pressure increases the proximity of the molecules. This increases the number of successful collisions per second, and so the rate of reaction increases.
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How does increasing the temperature increase the rate of reaction?
Increasing the temperature increases the kinetic energy of molecules. Therefore, a greater number have the activation energy, and there are more successful collisions per second, increasing the rate of reaction.
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How does increasing the surface area increase the rate of reaction?
Increasing the surface area means there are greater number of molecules available to react, and so more successful collisions per second.
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How do catalysts affect the rate of reaction?
Catalysts speed up the reation, and are not actually used up in the reaction themselves. They lower the activation energy by offering an alternative path.
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How does light affect the rate of reaction?
Some reactions are much more vigorous when carried out in bright light.
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What is the activation energy?
Activation energy is the minimum energy required for molecules to react, breaking existing bonds and forming new ones.
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If the products have less energy than the reactants, the reaction is?
Exothermic - energy has been given out.
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If the products have more energy than the reactants, the reaction is?
Endothermic - energy has been taken in.
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What is a activated complex?
This is where the pre existing bonds have partially broken, and the new bonds have begun to form.
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What is a homogeneous catalyst?
These are catalysts in the same phase as the reactants.
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Give an example of a homogeneous catalyst.
Iron Ion in the oxidation of iodine ions by peroxodisulfate.
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What is a heterogeneous catalyst?
These are catalysts that are in a different phase compared to the reactants.
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Give an example of a heterogeneous catalyst.
Iron in the Haber process or Vanadium oxide in the contact process.
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State the four ways for measuring the rate of reaction.
Change in volume, change in mass, change in gas pressure, colorimetry.
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Card 2

Front

How does increasing the pressure increase the rate of reaction?

Back

Increasing the pressure increases the proximity of the molecules. This increases the number of successful collisions per second, and so the rate of reaction increases.

Card 3

Front

How does increasing the temperature increase the rate of reaction?

Back

Preview of the front of card 3

Card 4

Front

How does increasing the surface area increase the rate of reaction?

Back

Preview of the front of card 4

Card 5

Front

How do catalysts affect the rate of reaction?

Back

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