Ability Test-Reversible Reactions (Selective)

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  • Created by: Heather
  • Created on: 19-07-14 19:20
What is a reversible reaction?
A reaction that can go both ways, so not only can the reactants react to produce products, the products can react and produce the reactants,
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What is a closed system?
One where none of the reactants or products can escape,
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If a reversible reaction is occurring in a closed system, what can happen?
It will reach a state of equilibrium
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Describe a reversible reaction's concentrations at the start and what affect this has on the speed of the direction?
Start: There is a high concentration of reactions and low concentration of products, meaning the forward reaction will be the fastest and the reverse will be slow,
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What happens after the reactants have reacted? Describe the amount of both product and reactants on either side and speed of the directions?
After, there is a higher concentration of products than reactants so the forward reaction slows down while the reversible reaction speeds up,
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After a little while, what eventually happens to the rates and the concentration?
The forward and reversible reaction end up going at the same rate, meaning the concentrations of the reactants and products will be the same,
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What is a dynamic equilibrium?
When the forward and reverse reactions are both still happening at the same rate so both products and reactants are still be made but it looks like nothing is happening,
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What does the position of equilibrium tell you?
The amount of reactants compared to the amount of products that are present hen the reaction reaches equilibrium,
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If you increase the pressure, conditions will favour which direction in a reversible reaction?
The forward reaction so more products is made,
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What are the advantages of increasing the pressure? (kinetic theory)
It means there are more particles in the same area, meaning there is less space between particles so they are more likely to collide with one another so increases the yield as it makes more products,
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What are the disadvantages of increasing the pressure?
It costs alot and uses lots of energy as well as strong equipment to stand up to the high pressures which would be expensive to buy and maintain,
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If you increase the temperature, conditions will favour which direction?
The reverse direction so more reactants are made,
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What are advantages of increasing the temperature?
It means the particles have a higher kinetic energy, meaning more particles will have enough activation energy to collide and react with other particles, making more products so increasing the yield,
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What are the disadvantages of increasing the temperature?
It requires lots of energy so will be very expensive. An expensive machine will also be needed to withstand the high temperatures
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What is Le Chatelier's Principle?
'A reversible reaction will move its equilibrium position to resist any change in the conditions,'
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Other cards in this set

Card 2

Front

What is a closed system?

Back

One where none of the reactants or products can escape,

Card 3

Front

If a reversible reaction is occurring in a closed system, what can happen?

Back

Preview of the front of card 3

Card 4

Front

Describe a reversible reaction's concentrations at the start and what affect this has on the speed of the direction?

Back

Preview of the front of card 4

Card 5

Front

What happens after the reactants have reacted? Describe the amount of both product and reactants on either side and speed of the directions?

Back

Preview of the front of card 5
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