Chemistry- Rates of Reaction

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  • Created by: lucy.wood
  • Created on: 28-03-17 18:54
What is a Rate of Reaction?
A rate of reaction is the time taken for a certain amount of reactant to be used up or a certain amount of product to form.
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What is the collision theory?
Chemical reactions can only happen if reactant particles collide with enough energy. The more frequently particles collide, and the greater the proportion of collisions with enough energy, the greater the rate of reaction.
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Reactions that happen slowly have a...
Low rate of reaction.
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Reactions that happen quickly have a...
High rate of reaction.
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What are the two ways to measure the rate of a reaction?
The rate at which a reaction is used up, and the rate at which the product is formed.
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What are the things to measure in the rate of reaction?
The mass of a substance-solid liquid or gas and the volume of a gas.
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What is the equation for measuring the rate of reaction?
Amount of reaction used or amount of product formed/ time taken.
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What is the effect of changing the temperature on the rate of reaction?
At a higher temperature, the rate of reaction increses. There will be more frequent collisions and the particles will have more energy.
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Why do vegetables last longer in a fridge?
The temperature is lower, and that slows down the rate of reaction.
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What would happen to a reaction if the temperature was lowered?
The rate of reaction would be lower, the particles are moving around less quickly so there would be less frequent collisions and particles have less energy so there would be fewer collisions that have enough energy for a reaction to occur.
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The effect that temperature has on the rate of reaction according to the collision theory...
Particles have less energy, less frequent and successful collisions....Particles have high energy, more frequent and successful collisions.
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What is a catalyst?
A substance that can increase the rate of a reaction without being used up itself.
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What effect does a catalyst have on the rate of a reaction?
A catalyst provides an alternative reaction pathway of lower activation energy.
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What effect does surface area have on the rate of reaction?
The larger the surface area, the faster the rate of reaction. More frequent collisions.
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Why do potatoes cook faster if they are cut into small pieces?
They have a larger surface area. The energy can then be transferred from the water to the potatoes more easily and quickly.
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What happens if the concentration reactant is increased or the pressure of a reacting gas is increased?
The reactant particles become more crowded. There is a greater chance of the particles colliding. The rate of reaction increases.
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Card 2

Front

What is the collision theory?

Back

Chemical reactions can only happen if reactant particles collide with enough energy. The more frequently particles collide, and the greater the proportion of collisions with enough energy, the greater the rate of reaction.

Card 3

Front

Reactions that happen slowly have a...

Back

Preview of the front of card 3

Card 4

Front

Reactions that happen quickly have a...

Back

Preview of the front of card 4

Card 5

Front

What are the two ways to measure the rate of a reaction?

Back

Preview of the front of card 5
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