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Qwerty90

Which of the following changes has a decrease in entropy?

  • 2 years ago
  • 2 years ago

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  1. Qwerty90
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    hg N2O4 (g) 2NO2 (g) 3O2 (g) + 2KCl (s) 2KClO3 (s) C2H5OH (l) + 3O2 (g) 2CO2 (g) + 3H2O (g) H2O (l) H2O (g)

    • 2 years ago
  2. Mani_Jha
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    Do you know what a decrease in entropy means?

    • 2 years ago
  3. Qwerty90
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    Yes. It means that the amount of randomness decreases eighter by the movement or amount of moleues

    • 2 years ago
  4. Qwerty90
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    But its hard to tell from these equATIONS

    • 2 years ago
  5. Mani_Jha
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    Now, see if I lump two free molecules(which had a lot randomness) into a single molecule of more weight, which will have more entropy(randomness), the two free molecules, or the resultant single heavier molecule? Did you get my question?

    • 2 years ago
  6. Qwerty90
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    Uhh. are you asking which would be heavier

    • 2 years ago
  7. Qwerty90
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    I get what you're saying in the first half but when you asked it looks like you left out th word "what" so I couldn't really see what you are asking

    • 2 years ago
  8. Mani_Jha
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    No, I am asking which one will move more easily i.e which will have more randomness. Of course, the single molecules formed as a product will be heavier than either of the reactants.

    • 2 years ago
  9. Qwerty90
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    Is it this one? 3O2 (g) + 2KCl (s) 2KClO3 (s)

    • 2 years ago
  10. Mani_Jha
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    Yes. Do you understand why? Two reactants combine to form a single product of more weight. This restricts movement.(It is difficult for a heavier particle to move). So, it has less entropy

    • 2 years ago
  11. Qwerty90
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    OHhh I got ya. So if it decreases we are looking for more of a solid or a more combined molecule. And if it increases we are looking for more seperation. Is this right>

    • 2 years ago
  12. Mani_Jha
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    Yes, exactly.

    • 2 years ago
  13. Qwerty90
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    one thing...Which of the following changes will always be true for a spontaneous reaction? Would this be 1deltaG

    • 2 years ago
  14. Qwerty90
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    Im sorry -1deltaG

    • 2 years ago
  15. Mani_Jha
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    Yes, whenever Gibb's Free Energy is negative, the reaction is spontaneous. Because then the change in enthalpy is negative. This means that the products are more stable than the reactants.

    • 2 years ago
  16. Qwerty90
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    And would boiling water be an example of an increase in entropy? or these filtering sand out of a sample of water synthesizing water from hydrogen and oxygen

    • 2 years ago
  17. Mani_Jha
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    Boiling water converts liquid water into gaseous water vapour. As the particles in a gas have more randomness, there is an increase in entropy. Synthesizing water from hydrogen and oxygen is again one case where two molecules lump together to form a heavier molecule. So what do you think?

    • 2 years ago
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