Entropy change ΔS

Last updated: 10/02/2020

WJEC A-Level Chemistry Unit 3.7 – Entropy and feasibility of reactions Entropy change ΔS

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Question 1 of 20

1. Question
What is the definition of entropy?
- Measures the degree of disorder in a system
- Measures the amount of activity in a system
- Measures the amount of enthalpy in a system
- Measures the degree of energy in a system
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Question 2 of 20

2. Question
What is the symbol for entropy?
- S
- E
- En
- T
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Question 3 of 20

3. Question
What is the definition of the standard entropy?
- The entropy content of one mole of a substance under standard conditions
- The entropy content of one mole of a gaseous substance
- The entropy content of one mole of a substance
- The entropy content of a substance under standard conditions
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Question 4 of 20

4. Question
What is the definition of the standard entropy change of reaction?
- The entropy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions
- The entropy change that accompanies a reaction in the molar quantities
- The entropy change needed to make one mole of a gaseous substance under standard conditions
- The entropy change of a reaction
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Question 5 of 20

5. Question
What is the symbol for the standard entropy?
- S $^ө$
- LE $^ө$
- ET $^ө$
- En $^ө$
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Question 6 of 20

6. Question
What is the symbol for the standard entropy change of a reaction?
- ΔS $^ө$
- ΔH $^ө$
- ΔE $^ө$
- $Δ_{LE}^ө$
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Question 7 of 20

7. Question
What is the equation used to find the standard entropy of a reaction?
- Entropy sum of products – entropy sum of reactants
- Entropy sum of products x entropy sum of reactants
- Entropy sum of reactants – entropy sum of products
- Entropy sum of reactants / entropy sum of products
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Question 8 of 20

8. Question
What are the units for standard entropies?
- $J mol^{−1} K^{−1}$
- $J mol^{−1} K$
- $J mol K^{−1}$
- $J mol K$
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Question 9 of 20

9. Question
Which of the following affects entropy?
- Number of gas molecules
- Number of moles
- Volume of reactants and products
- Pressure of the reactions
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Question 10 of 20

10. Question
For which type of substances is the entropy at zero at 0 K?
- Perfect crystals
- Dissolved substances
- Metal salts
- Hydroxides
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Question 11 of 20

11. Question
What does it mean if the change in entropy is positive?
- System is more random
- System contains less energy
- System contains more energy
- System is more ordered
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Question 12 of 20

12. Question
What does it mean if the change in entropy is negative?
- System is more ordered
- System contains less energy
- System contains more energy
- System is more random
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Question 13 of 20

13. Question
What happens to the amount of energy as entropy increases?
- More spreading out of particles
- Less spreading out of particles
- Amount of energy increases
- Amount of energy decreases
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Question 14 of 20

14. Question
What happens to particle arrangement as entropy increases?
- Particles will have a more random arrangement
- Particles move next to one another
- Particles will randomly collide
- Particles become closer together
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Question 15 of 20

15. Question
Describe the amount of entropy in solids compared to gases.
- Gases have a higher amount of entropy than solids
- Solids have a higher amount of entropy than gases
- They both have the same amount of entropy
- It will depend on which substances
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Question 16 of 20

16. Question
Describe the amount of entropy in liquids compared to solids.
- Gases have a higher amount of entropy than liquids
- Liquids have a higher amount of entropy than gases
- They both have the same amount of entropy
- It will depend on which substances
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Question 17 of 20

17. Question
Describe the amount of disorder in solids compared to gases.
- Gases have more disorder than solids
- Gases have less disorder than solids
- They both have the same amount of entropy
- It will depend on which substances
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Question 18 of 20

18. Question
Describe the amount of disorder in solids compared to liquids.
- Liquids have more disorder than solids
- Liquids have less disorder than solids
- They both have the same amount of entropy
- It will depend on which substances
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Question 19 of 20

19. Question
Describe the amount of disorder in liquids compared to gases.
- Gases have more disorder than liquids
- Gases have less disorder than liquids
- They both have the same amount of entropy
- It will depend on which substances
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Question 20 of 20

20. Question
Describe the amount of entropy in solids compared to liquids.
- Liquids have a higher amount of entropy than solids
- Solids have a higher amount of entropy than liquids
- They both have the same amount of entropy
- It will depend on which substances
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