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Chemical Physics and Physical Chemistry Forum | Forum profile
Forum profile page for Chemical Physics and Physical Chemistry Forum on http://www.chemicalforums.com. This report page is the aggregated overview from a single forum: Chemical Physics and Physical Chemistry Forum, located on the Message Board at http://www.chemicalforums.com. This forum profile page summarizes the general forum statistics such as: Users Activity, Forum Activity, and Top Authors, which are reported in either a table or graph below for a given reporting time period. Additional forum profile information for "Chemical Physics and Physical Chemistry Forum" on the Message Board at http://www.chemicalforums.com is also shown in the following ways:

1) Latest Active Threads
2) Hot Threads for Last Week

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Site: Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help - Chemical Physics and Physical Chemistry Forum
Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
(site profile, domain info chemicalforums.com)
Title: Chemical Physics and Physical Chemistry Forum
Url: http://www.chemicalforums.com/index.php?board=6.0
Users activity: 18 post per thread
Forum activity: 14 active threads during last week
 

Posting activity on Chemical Physics and Physical Chemistry Forum:

  Week Month 3 Months
Threads: 14 51 147
Post: 19 98 265
 

Chemical Physics and Physical Chemistry Forum Posting activity graph:

Posts by:  day  week  month 

Top authors during last week:

Name
Posts
darien2009
2
user's latest post:
question about calculate of...
Published (2009-11-27 03:56:00)
which law is right? H2-H1 or H1-H2 1 for reactants 2 for products
coda
2
user's latest post:
Molecule size of water and oxygen
Published (2009-11-29 01:10:00)
Thanks, i have got most of the answer. The size i mean is really just spaces a molecule can take. And i asume that 1 oxygen molecule is taken more space than 1 water molecule. The materials i know i only can find something with holes so small that only water's molecules can pass. But i really cannot think of any and can't sure that this kind of materials exist on the market. Can you give me any sugguestion? thanks  
lugerard
2
user's latest post:
Gibbs free energy
Published (2009-12-01 15:38:00)
So when do we actually use ΔG(T1) = ΔH(T1) - (T2-T1)ΔS(T1)
Yggdrasil
2
user's latest post:
Gibbs free energy
Published (2009-11-30 15:49:00)
Quote from: lugerard on Today at 03:38:40 PM So when do we actually use ΔG(T1) = ΔH(T1) - (T2-T1)ΔS(T1) You don't.  That's not a valid expression.
Fridushka
2
user's latest post:
CRxS=Yx100..how?
Published (2009-12-01 09:05:00)
well i got how it is... thx now, if any one need help regardig this..let them send me a msg and i'll help:)
BigMan
1
user's latest post:
Proton condition equation question.
Published (2009-11-27 01:01:00)
Greetings Looking over some past coursework for my course i came about a question asking to derive an appropriate proton condition equation for a solution of maleic acid, then from this to use a graph, log over ph (have a spreadsheet set that gives the graph) to identify the point where the proton condition equation is satisfied. I'm not really sure as to how to go around this. I know that maleic acid is a diprotic acid and as such...
bstanley
1
user's latest post:
How to determine the rate of...
Published (2009-11-26 18:35:00)
Hi all, I am working with a surfactant. Above a "critical micelle concentration", surfactant molecules aggregates together to form a micelle. A good example of this is sodium dodecyl sulphate. Anyway, I have a surfactant and I want to measure the rate constant of formation of this micelle. Can someone recommend a type of experiment that can be done to measure this? Basically I want to find out how fast is the micelle form....
vijay_cluster
1
user's latest post:
chemical equilibrium
Published (2009-11-27 05:24:00)
1) A vessel contains N2O4 and NO2 at pressures 2 atm and 1 atm respectively. If the equilibrium pressure of NO2 is 1.8 atm, total pressure at equilibrium will be (in atm) The answer is given as 3.4 atm. 2) 0.25 mole NH4HS(S) is heated in a 4 Litre vessel so that 0.125 mole left at equilibrium. Now Kc for NH4HS (s) equilibrium with  NH3(g) + H2S(g) is   The answer is given as 1/(32)2   Can any body solve these two...
Borek
1
user's latest post:
chemical equilibrium
Published (2009-11-27 06:18:00)
Quote from: vijay_cluster on Today at 05:24:43 AM Can any body solve these two problems for me No. Plese read forum rules .
domaca
1
user's latest post:
Good material on electrochemistry
Published (2009-11-28 04:00:00)
Harris, Daniel - Quantitative Chemical Analysis has several good chapters on electrochemistry.
  

Latest active threads on Chemical Physics and Physical Chemistry Forum::

Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 1 week ago (2009-11-30 15:49:00)  by Yggdrasil
Quote from: lugerard on Today at 03:38:40 PM So when do we actually use ΔG(T1) = ΔH(T1) - (T2-T1)ΔS(T1) You don't. That's not a valid expression.
Thread:  Show this thread (6 posts)   Thread info: Gibbs free energy Size: 333 bytes
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Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 6 days ago (2009-12-01 17:14:00)  by Yggdrasil
Quote from: lysiepoo on Yesterday at 01:01:31 PM I was also taught in biology to think of oxidation in metabolism as a release of potential energy held by C-C or C-H bonds (due to equal sharing of electrons turning into a polarized sharing of electrons, releasing chemical potential energy). However oxidation does not always result in this change, sometimes it occurs by turning a polarized ...
Thread:  Show this thread (3 posts)   Thread info: Bond energy, redox reactions, and thermodynamics Size: 6,262 bytes
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Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 6 days, 8 hours ago (2009-12-01 09:05:00)  by Fridushka
well i got how it is... thx now, if any one need help regardig this..let them send me a msg and i'll help:)
Thread:  Show this thread (2 posts)   Thread info: CRxS=Yx100..how? Size: 220 bytes
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Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 1 week, 1 day ago (2009-11-29 01:10:00)  by coda
Thanks, i have got most of the answer. The size i mean is really just spaces a molecule can take. And i asume that 1 oxygen molecule is taken more space than 1 water molecule. The materials i know i only can find something with holes so small that only water's molecules can pass. But i really cannot think of any and can't sure that this kind of materials exist on the market. Can you give me ...
Thread:  Show this thread (4 posts)   Thread info: Molecule size of water and oxygen Size: 479 bytes
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Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 2 weeks ago (2009-11-23 13:51:00)  by MackTuesday
So chemical potential energy is included in enthalpy. That helps! Thank you. If you're still feeling charitable I have a couple more questions. If not I certainly can't blame you. What if the system is rigid and adiabatic? (By that I mean d(PV) = 0 and there's no heat transfer across the system boundary.) Is it possible for enthalpy to change in that case? It seems like we must have dU = ...
Thread:  Show this thread (6 posts)   Thread info: Atkins or McQuarrie? Or something else? Size: 730 bytes
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Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 1 week, 2 days ago (2009-11-28 04:00:00)  by domaca
Harris, Daniel - Quantitative Chemical Analysis has several good chapters on electrochemistry.
Thread:  Show this thread (2 posts)   Thread info: Good material on electrochemistry Size: 94 bytes
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Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 1 week, 3 days ago (2009-11-27 06:18:00)  by Borek
Quote from: vijay_cluster on Today at 05:24:43 AM Can any body solve these two problems for me No. Plese read forum rules .
Thread:  Show this thread (2 posts)   Thread info: chemical equilibrium Size: 377 bytes
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Chemical Forums: Chemistry Forum, Chemistry Question, Chemistry Help
Started 2 months, 1 week ago (2009-10-01 07:05:00)  by sjb
Write a balanced equation for the reaction Which bonds have you broken? Which have you made?
Thread:  Show this thread (7 posts)   Thread info: question about calculate of enthalpy Size: 105 bytes
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Hot threads for last week on Chemical Physics and Physical Chemistry Forum::

Chemical Physics and Physical Chemistry Forum
Started 1 week ago (2009-11-30 15:49:00)  by Yggdrasil
Quote from: lugerard on Today at 03:38:40 PM So when do we actually use ΔG(T1) = ΔH(T1) - (T2-T1)ΔS(T1) You don't. That's not a valid expression.
Thread:  Show this thread (6 posts)   Thread info: Gibbs free energy Size: 333 bytes
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Chemical Physics and Physical Chemistry Forum
Started 1 week, 1 day ago (2009-11-29 01:10:00)  by coda
Thanks, i have got most of the answer. The size i mean is really just spaces a molecule can take. And i asume that 1 oxygen molecule is taken more space than 1 water molecule. The materials i know i only can find something with holes so small that only water's molecules can pass. But i really cannot think of any and can't sure that this kind of materials exist on the market. Can you give me ...
Thread:  Show this thread (4 posts)   Thread info: Molecule size of water and oxygen Size: 479 bytes
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Customize:  Customize "Re: Molecule size of water and oxygen :: Chemical Physics and Physical Chemistry Forum :: Chemical Forums: Chemistry Forum, Chemistry Questi..."
Chemical Physics and Physical Chemistry Forum
Re: CRxS=Yx100..how? - 2 new posts
Started 6 days, 8 hours ago (2009-12-01 09:05:00)  by Fridushka
well i got how it is... thx now, if any one need help regardig this..let them send me a msg and i'll help:)
Thread:  Show this thread (2 posts)   Thread info: CRxS=Yx100..how? Size: 220 bytes
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Chemical Physics and Physical Chemistry Forum
Started 2 weeks ago (2009-11-23 13:51:00)  by MackTuesday
So chemical potential energy is included in enthalpy. That helps! Thank you. If you're still feeling charitable I have a couple more questions. If not I certainly can't blame you. What if the system is rigid and adiabatic? (By that I mean d(PV) = 0 and there's no heat transfer across the system boundary.) Is it possible for enthalpy to change in that case? It seems like we must have dU = ...
Thread:  Show this thread (6 posts)   Thread info: Atkins or McQuarrie? Or something else? Size: 730 bytes
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Customize:  Customize "Re: Atkins or McQuarrie? Or something else? :: Chemical Physics and Physical Chemistry Forum :: Chemical Forums: Chemistry Forum, Chemistry Questi..."
Chemical Physics and Physical Chemistry Forum
Started 6 days ago (2009-12-01 17:14:00)  by Yggdrasil
Quote from: lysiepoo on Yesterday at 01:01:31 PM I was also taught in biology to think of oxidation in metabolism as a release of potential energy held by C-C or C-H bonds (due to equal sharing of electrons turning into a polarized sharing of electrons, releasing chemical potential energy). However oxidation does not always result in this change, sometimes it occurs by turning a polarized ...
Thread:  Show this thread (3 posts)   Thread info: Bond energy, redox reactions, and thermodynamics Size: 6,262 bytes
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Customize:  Customize "Re: Bond energy, redox reactions, and thermodynamics :: Chemical Physics and Physical Chemistry Forum :: Chemical Forums: Chemistry Forum, Chemistry Questi..."