Entropy change ΔS

Last updated: 10/02/2020

OCR-A A-Level Chemistry Enthalpy and entropy Entropy change ΔS

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Question 1 of 20

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

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

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

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

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

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

7. Question
What is the equation used to find the standard entropy of a reaction?
- 1. Entropy sum of products x entropy sum of reactants
- 2. Entropy sum of products – entropy sum of reactants
- 3. Entropy sum of reactants – entropy sum of products
- 4. 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?
- 1. $J mol^{−1} K^{−1}$
- 2. $J mol K^{−1}$
- 3. $J mol^{−1} K$
- 4. $J mol K$
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Question 9 of 20

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

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

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

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

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

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

15. Question
Describe the amount of entropy in solids compared to gases.
- 1. Solids have a higher amount of entropy than gases
- 2. Gases have a higher amount of entropy than solids
- 3. They both have the same amount of entropy
- 4. 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.
- 1. They both have the same amount of entropy
- 2. It will depend on which substances
- 3. Liquids have a higher amount of entropy than gases
- 4. Gases have a higher amount of entropy than liquids
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Question 17 of 20

17. Question
Describe the amount of disorder in solids compared to gases.
- 1. Gases have more disorder than solids
- 2. Gases have less disorder than solids
- 3. They both have the same amount of entropy
- 4. 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.
- 1. It will depend on which substances
- 2. They both have the same amount of entropy
- 3. Liquids have less disorder than solids
- 4. Liquids have more disorder than solids
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Question 19 of 20

19. Question
Describe the amount of disorder in liquids compared to gases.
- 1. Gases have less disorder than liquids
- 2. Gases have more disorder than liquids
- 3. They both have the same amount of entropy
- 4. 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.
- 1. It will depend on which substances
- 2. They both have the same amount of entropy
- 3. Solids have a higher amount of entropy than liquids
- 4. Liquids have a higher amount of entropy than solids
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