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/sci/ - Science & Math

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4263218 No.4263218 [Reply] [Original]

Quick chemistry/entropy question:
let's say you have a reaction where one big molecule and one small molecule react to form two mid sized molecules.
Which side, if any, of the reaction is entropically favored/has a higher entropy and why?
inb4 homework: it's not, im just interested.
in return: c++ sparkchart bump.

>> No.4263222
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>> No.4263314
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>> No.4263327

Fuck c++ and everything about it.

>> No.4263358
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4263358

someone has to know this..

>> No.4263388

>>4263218
well when molecules combine
they build a molecule in which they're in the lowest energy state
this means that they were in high energy state
and entropy means that the small part of energy that was there initially is now gone
in the form of heat or light or whatever...

>> No.4263407

>>4263388
Okay.
Next question: How to reverse entropy?

>> No.4263411

>>4263407
Push every particle and energy back in time to where it was, as far back as you need to go.

>> No.4263413

let's say you have a reaction where one big molecule and one small molecule react to form two mid sized molecules.
Two things that affect entropy are at play here: size and number of particles. A large particle is more entropic than a smaller particle (assuming they are of EXACTLY the same physical makeup). Next is the number of particles. Two particles becoming one particle would be a decrease in entropy (again, assuming they maintain their phase). In your question, the number of reactants is the same as the number of products. So it comes down to size.

The way I would handle this is by assigning unit-less numbers. Let's say big = 3, medium = 2, and small = 1. The reactants are big + small = 3. The reactants are medium + medium = 4. In that, I'd say that the reactants exhibit more entropy than the reactants, though it feels somewhat counterintuitive to me.

>> No.4263414

>>4263407
INSUFFICIENT DATA AVAILABLE

>> No.4263418

>>4263407
If you are implying to reverse the reaction:
G=H-TS
If S isn't favorable, work at low T and enthalpy must be exothermic.
If the S is favorable: heat it up a bit.

But I have actually no idea what you are >implying

>> No.4263420

>>4263407
reverse time...
actually entropy is the only think that makes time have a direction

>> No.4263424

>>4263407
reverse entropy of what? the system or the surrounding? if you want to reverse entropy of the system you need to expend energy and increase entropy of the surrounding. Anyway for your previous question i don't think it is possible to discuss entropy at a molecular or atomic level,

>> No.4263447

Does anyone have a link to all the sparkcharts available?

>> No.4263450
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>>4263413
in your example big + small = 4 so they would actually be the same...