Why should chemists care about entropy?

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Discussion Overview

The discussion revolves around the significance of entropy in chemistry, particularly why chemists should care about it. Participants explore its implications in various chemical phenomena, including the dissolution of substances and the elasticity of materials, while also addressing the conceptual understanding of entropy.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Meta-discussion

Main Points Raised

  • One participant questions the importance of entropy, noting its role as a measure of disorder and possible outcomes, but expressing confusion about its relevance to chemists.
  • Another participant raises specific examples related to entropy, such as the dissolution of ammonium chloride in water and the elasticity of rubber, suggesting these phenomena may be explained by entropy.
  • A different participant assumes that entropy is a key factor in the examples provided and requests further explanation.
  • One participant expresses reluctance to explain entropy, suggesting that the basics are covered in introductory chemistry textbooks and implying that the original question indicates a lack of effort to learn the material independently.
  • Another participant presents a viewpoint that entropy is an abstraction of micro-properties of substances, arguing that while it may not be necessary for small systems, it becomes essential for larger systems where direct calculations are impractical.
  • This participant uses the analogy of flipping a coin to illustrate the probabilistic nature of entropy, emphasizing the need for further understanding before delving deeper into the topic.

Areas of Agreement / Disagreement

Participants express differing views on the importance of understanding entropy, with some emphasizing its fundamental role in chemistry and others questioning the necessity of detailed knowledge. The discussion remains unresolved, with no consensus on the best approach to learning about entropy.

Contextual Notes

Some participants highlight the limitations of understanding entropy without prior knowledge, indicating that the discussion may depend on varying levels of familiarity with the concept.

samblohm
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Why is it important? I know it is a measure of the disorder of the system and the amount of possible outcomes. If it always increases, why should any chemist care about it?
 
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Why does ammonium chloride dissolve in water?
Why is rubber elastic?
 
I assume because of its entropy. Could you explain?
 
I could explain, but I don't see why I should. Every general/introductory chemistry textbook covers the basics of entropy in chemistry.
So if you're asking this question, you haven't made an effort to find out on your own. In which case I'm disinclined to help.

Please read up on the subject, then come back and ask if you don't understand something. But don't ask for a private lesson.
 
Well IMO, entropy is just a abstraction of what's actually going on. I mean entropy is a macro property based on a substances micro-properties. Now if you have a gas in a container and you only have 2 gas molecules then you wouldn't need entropy. You can do all the calculations you want just using by analyzing the interaction of the 2 molecules (Of course in an ideal container).

But what about when you have 1million? Anyone can easily see that doing such calculations is almost (if not actually) impossible (Since, technically, using classical physics we could calculate every single position the molecules would assume. But that would require a vast computational power beyond our ability). So why bother when you can use entropy, to approximate it? (I couldn't find a better word than approximate)

Now since I believe that what alxm said is true I will refrain from telling you too much until you have a better idea of what entropy actually is.

(Hint: what happens when you flip a coin? you could calculate the side that will come up, but instead you say that there's a 50-50 probability of heads or tails. Think a bit now...)

Disclaimer: Do not assume I am right, do your on research...
 

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