Equilibrium constant Kp for homogeneous systems

Last updated: 11/02/2020

AQA A-Level Chemistry Equilibrium constant Kp for homogeneous systems Equilibrium constant Kp for homogeneous systems

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Question 1 of 28

1. Question
What is the definition of a mole fraction?
- The proportion of a gas by volume compared to the total volume of gases in a gas mixture
- A measure of the amount of a product that is present in a reaction
- The amount of moles of a substance
- A measure of the amount of a reactant that is present within a reaction mixture
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Question 2 of 28

2. Question
What is the symbol for a mole fraction?
- M $_f$
- M $_o$
- X $_m$
- X $_a$
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Question 3 of 28

3. Question
How do you calculate a mole fraction?
- number of moles of a substance / total number of moles of all substances
- total number of moles of all substances / number of moles of a substance
- number of moles of a substance + total number of moles of all substances
- number of moles of a substance x total number of moles of all substances
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Question 4 of 28

4. Question
What is the definition of a partial pressure?
- The pressure an individual gaseous substance would exert if it occupied a whole reaction vessel on its own
- The pressure of all the gaseous substances within a given reaction
- The pressure of an individual gaseous substance at equilibrium
- The pressure an individual gaseous substance would exert if it occupied a whole reaction vessel with oxygen
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Question 5 of 28

5. Question
What is the symbol for a partial pressure?
- p
- pp
- Pa
- Pr
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Question 6 of 28

6. Question
How do you calculate a partial pressure?
- mole fraction x total pressure
- mole fraction + total pressure
- total pressure / mole fraction
- mole fraction / total pressure
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Question 7 of 28

7. Question
What is proportional to partial pressure?
- Concentration
- Number of moles
- Volume
- Density
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Question 8 of 28

8. Question
What is the symbol for the partial pressure equilibrium constant?
- $K_p$
- $K_r$
- $K_w$
- $K_a$
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Question 9 of 28

9. Question
When writing a K $_p$ equation, what type of brackets should be used?
- Round
- Square
- No brackets
- Any brackets
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Question 10 of 28

10. Question
Within a reaction there is 0.3 mol of NaF and 0.2 mol of Cl $_2$ . Work out the mole fraction of Cl $_2$ , leave your answer to two decimal places.
- 0.40
- 0.28
- 0.20
- 0.39
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Question 11 of 28

11. Question
When writing a K $_p$ expression for a heterogeneous reaction, which of the following types of substances should not be included?
- Solids
- Liquids
- Gases
- Aqueous
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Question 12 of 28

12. Question
When writing a K $_p$ expression for a homogeneous reaction, which of the following types of substances should not be included?
- Pure liquids
- Liquids
- Solids
- Gases
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Question 13 of 28

13. Question
When an equilibrium constant is more than one which is favoured, left or right?
- Right
- Left
- Depends on the type of reaction
- Depends on whether the reaction is exothermic and endothermic
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Question 14 of 28

14. Question
When an equilibrium constant is less than one which is favoured, left or right?
- Left
- Right
- Depends on the type of reaction
- Depends on whether the reaction is exothermic and endothermic
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Question 15 of 28

15. Question
When an equilibrium constant is more than one which is favoured, reactants or products?
- Products
- Reactants
- Depends on the type of reaction
- Depends on whether the reaction is exothermic and endothermic
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Question 16 of 28

16. Question
When an equilibrium constant is less than one which is favoured, reactants or products?
- Reactants
- Products
- Depends on the type of reaction
- Depends on whether the reaction is exothermic and endothermic
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Question 17 of 28

17. Question
Which of the following equilibrium constants are affected by a temperature change?
- K $_c$
- K $_m$
- K $_a$
- K $_w$
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Question 18 of 28

18. Question
Which of the following equilibrium constants are affected by a temperature change?
- K $_p$
- K $_e$
- K $_a$
- K $_w$
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Question 19 of 28

19. Question
If a reaction is endothermic what happens to the equilibrium constant as temperature is increased?
- Equilibrium constant increases
- Equilibrium constant decreases
- Equilibrium constant stays the same
- It will depend on the pressure of a reaction
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Question 20 of 28

20. Question
If a reaction is exothermic what happens to the equilibrium constant as temperature is increased?
- Equilibrium constant decreases
- Equilibrium constant increases
- Equilibrium constant stays the same
- It will depend on the pressure of a reaction
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Question 21 of 28

21. Question
What happens to the equilibrium constant if the concentration of the reactants is increased?
- Equilibrium constant stays the same
- Equilibrium constant decreases
- Equilibrium constant increases
- It will depend on the chemicals and ratios involved
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Question 22 of 28

22. Question
What happens to the equilibrium constant if the concentration of the reactants is decreased?
- Equilibrium constant stays the same
- Equilibrium constant decreases
- Equilibrium constant increases
- It will depend on the chemicals and ratios involved
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Question 23 of 28

23. Question
What happens to the equilibrium constant if the pressure of the reactants is increased?
- Equilibrium constant stays the same
- Equilibrium constant decreases
- Equilibrium constant increases
- It will depend on the chemicals and ratios involved
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Question 24 of 28

24. Question
What happens to the equilibrium constant if the pressure of the reactants is decreased?
- Equilibrium constant stays the same
- Equilibrium constant decreases
- Equilibrium constant increases
- It will depend on the chemicals and ratios involved
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Question 25 of 28

25. Question
Within a reaction, if the concentration of the reactants is increased what does the position of equilibrium do in order to minimise the effect on K $_p$ ?
- Position of equilibrium shifts to the right
- Position of equilibrium shifts to the left
- Position of equilibrium shifts stays the same
- Shift in equilibrium will depend on the chemicals and ratios involved
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Question 26 of 28

26. Question
Within a reaction, if the concentration of the products is increased what does the position of equilibrium do in order to minimise the effect on K $_p$ ?
- Position of equilibrium shifts to the left
- Position of equilibrium shifts to the right
- Position of equilibrium shifts stays the same
- Shift in equilibrium will depend on the chemicals and ratios involved
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Question 27 of 28

27. Question
Within a reaction, if the pressure of both the reactants and products is doubled what does the position of equilibrium do in order to minimise the effect on K $_p$ ?
- Position of equilibrium shifts to the left
- Position of equilibrium shifts to the right
- Position of equilibrium shifts stays the same
- Shift in equilibrium will depend on the chemicals and ratios involved
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Question 28 of 28

28. Question
What happens to K $_p$ if a catalyst is added to a reaction?
- Stays the same
- Increases
- Decreases
- It will depend on whether the reaction is exothermic or endothermic
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