Le Chatelier’s principle and dynamic equilibrium

Last updated: 06/02/2020

AQA A-Level Chemistry Chemical equilibria, Le Chatelier’s Principle and Kc Le Chatelier’s principle and dynamic equilibrium

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Question 1 of 24

1. Question
A reaction is exothermic. What happens to the position of equilibrium when the temperature is increased?
- The position of equilibrium will move to the left
- The position of equilibrium will move to the right
- The position of equilibrium will not change
- It is dependant on the reactants and products in the reaction
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Question 2 of 24

2. Question
A reaction is exothermic. What happens to the position of equilibrium when the temperature is decreased?
- The position of equilibrium will move to the right
- The position of equilibrium will move to the left
- The position of equilibrium will not change
- It is dependant on the reactants and products in the reaction
Correct

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Question 3 of 24

3. Question
A reaction is endothermic. What happens to the position of equilibrium when the temperature is increased?
- The position of equilibrium will move to the right
- The position of equilibrium will move to the left
- The position of equilibrium will not change
- It is dependant on the reactants and products in the reaction
Correct

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Question 4 of 24

4. Question
A reaction is endothermic. What happens to the position of equilibrium when the temperature is decreased?
- The position of equilibrium will move to the left
- The position of equilibrium will move to the right
- The position of equilibrium will not change
- It is dependant on the reactants and products in the reaction
Correct

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Question 5 of 24

5. Question
Why, within an exothermic reaction, does the position of equilibrium shift to the left when the temperature is increased?
- The system is opposed by taking in heat
- The system is opposed by releasing heat
- Heat is lost
- Heat is gained
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Question 6 of 24

6. Question
Why, within an exothermic reaction, does the position of equilibrium shift to the right when the temperature is decreased?
- The system is opposed by releasing heat
- The system is opposed by taking in heat
- Heat is lost
- Heat is gained
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Question 7 of 24

7. Question
What does the addition of a catalyst do to the position of equilibrium?
- The position of equilibrium will not change
- The position of equilibrium will move to the right
- The position of equilibrium will move to the left
- It is dependant on the reactants and products in the reaction
Correct

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Question 8 of 24

8. Question
Why, within an endothermic reaction, does the position of equilibrium shift to the right when the temperature is increased?
- The system is opposed by releasing heat
- The system is opposed by taking in heat
- Heat is lost
- Heat is gained
Correct

Incorrect
Question 9 of 24

9. Question
Why, within an endothermic reaction, does the position of equilibrium shift to the left when the temperature is increased?
- The system is opposed by taking in heat
- The system is opposed by releasing heat
- Heat is lost
- Heat is gained
Correct

Incorrect
Question 10 of 24

10. Question
When taking into consideration equilibrium position factors, how do chemists manage reactions?
- Aim for the highest possible yield, but also considering the optimum position of equilibrium allowing reactions to be cheap and energy-efficient.
- Aim for the highest possible yield.
- Aim for the cheapest method of reaction.
- Aim for the lowest possible yield, but also considering the optimum position of equilibrium allowing reactions to be cheap and energy-efficient.
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Question 11 of 24

11. Question
When writing a chemical equation, which arrow is used to signify that the reaction has been completed?
- ->
- ⇌
- ⭬
- ↔
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Question 12 of 24

12. Question
When writing a chemical equation, which arrow is used to signify that the reaction is reversible?
- ⇌
- ->
- ⭬
- ↔
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Question 13 of 24

13. Question
What is the definition of equilibrium?
- When there is a chemical balance between both reactants and products in a reaction
- Everything is the same in a reaction
- When a reaction has been fully completed with no reactants left
- Midway through a chemical reaction
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Question 14 of 24

14. Question
What is the definition of dynamic equilibrium?
- When the rate of the forward reaction is the same as the rate of the reverse reaction
- A balance between reactants and products
- Pressure is constant in both the forward reaction and the reverse reaction
- When the rate of the forward reaction is different to the rate of the reverse reaction
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Question 15 of 24

15. Question
What happens to the concentrations of both reactants and products when a reaction is in dynamic equilibrium?
- They remain the same
- The reactants have a higher concentration than the products
- The products have a higher concentration than the reactants
- Both concentrations increase
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Question 16 of 24

16. Question
What is the definition of the position of equilibrium?
- The point where there is a balance between reactants and products
- The point where there is an equal number of moles between reactants and products
- The point where equilibrium finishes
- The point where equilibrium starts
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Question 17 of 24

17. Question
Describe the type of system for a reaction in dynamic equilibrium.
- Closed
- Open
- Heated
- Gaseous
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Question 18 of 24

18. Question
What is the definition of Le Chatelier’s Principle?
- When a reaction is in dynamic equilibrium the position of equilibrium will shift to minimise the change in the reaction.
- Equal concentrations of reactants and products.
- The balance between reactants and products.
- When a reaction is in dynamic equilibrium the position of equilibrium will shift to maximise the change in the reaction.
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Question 19 of 24

19. Question
What will the position of equilibrium do if the concentration of the reactants is increased within a chemical reaction?
- Position of equilibrium will minimise the change by decreasing the concentration of the reactant.
- Position of equilibrium will minimise the change by decreasing the concentration of the product.
- Position of equilibrium will minimise the change by increasing the concentration of the reactant.
- Position of equilibrium will minimise the change by increasing the concentration of the product.
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Question 20 of 24

20. Question
Which side of a chemical equation will the position favour if the concentration of the reactants is increased in a chemical reaction?
- Right, forming more products
- Left, forming more reactants
- Both sides
- Neither side
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Question 21 of 24

21. Question
What will the position of equilibrium do if the concentration of the products is increased within a chemical reaction?
- Position of equilibrium will minimise the change by decreasing the concentration of the product.
- Position of equilibrium will minimise the change by decreasing the concentration of the reactant.
- Position of equilibrium will minimise the change by increasing the concentration of the reactant.
- Position of equilibrium will minimise the change by increasing the concentration of the product.
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Question 22 of 24

22. Question
Which side of a chemical equation will the position favour if the concentration of the products is increased within a chemical reaction?
- Left, forming more reactants
- Right, forming more products
- Both sides
- Neither side
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Question 23 of 24

23. Question
What will the position of equilibrium do if the pressure is increased within a chemical reaction?
- Favour the side with the fewest number of gaseous moles
- Favour the side with the fewest number of moles
- Favour the side with the highest number of gaseous moles
- Favour the side with the highest number of moles
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Question 24 of 24

24. Question
What will the position of equilibrium do if the pressure is decreased within a chemical reaction?
- Favour the side with the highest number of gaseous moles
- Favour the side with the fewest number of moles
- Favour the side with the fewest number of gaseous moles
- Favour the side with the highest number of moles
Correct

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