May 25, 2024, 12:39:48 PM
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Undergraduate General Chemistry Forum / Re: Reverse Diffusion Demonstration
« Last post by Corribus on Today at 09:20:51 AM »
The failure after the battery being turned off could just be a matter of kinetics. Under Borek's theory of corrosion, corrosive substances generated during the cell operation could take some time to cause enough damage to reach the point of failure.
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Analytical Chemistry Forum / Re: Kinetic chain reaction mechanism
« Last post by Linh_ on Today at 08:56:40 AM »
Quote from: Hunter2 on Today at 07:56:21 AM
First is CH4 = k2*CH3°*H2/H° and CH4 = k3*C2H6*H°/CH3° ?
CH4 = k2*CH3°*H2 + k3*C2H6*H°, from the two propagation reactions.
Also the suggested mechanism is part of the question and not something I chose.

Can you explain more please? substituting here doesn't lead to anything and I don't know what to do
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Analytical Chemistry Forum / Re: Kinetic chain reaction mechanism
« Last post by Hunter2 on Today at 07:56:21 AM »
First is CH4 = k2*CH3°*H2/H° and CH4 = k3*C2H6*H°/CH3° ?

Only this two equations have to be combined.
Substitute H° in first equation with second equation and solve for CH4.

Initiation and Termination is in my opinion not necessary. It's not part of the chain reaction.
Termination have more possibilities like 2 H° => H2 or CH3° + H° => CH4



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Analytical Chemistry Forum / Kinetic chain reaction mechanism
« Last post by Linh_ on Today at 07:15:54 AM »
this is the question and the beginning of my answer
https://imgur.com/a/Xw0AM7I

I just don't know what to do from here, I tried substituting but it doesn't help and I don't have any other idea.
Can someone help me please?
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Undergraduate General Chemistry Forum / Re: Reverse Diffusion Demonstration
« Last post by S_Ch_S on Today at 03:19:01 AM »
Thank you again for the response, it seems very weird that this happened especially after turning the voltage off.
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Undergraduate General Chemistry Forum / Re: Reverse Diffusion Demonstration
« Last post by Borek on Today at 03:00:08 AM »
Three factors that could contribute to the failure: hydrogen, chlorine, and pH going up. Hydrogen seems to be the least problematic, but both chlorine and high pH can easily speed up corrosion/decomposition of many substances/glues.

Doesn't mean it wasn't just a completely random thing.
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Undergraduate General Chemistry Forum / Re: Reverse Diffusion Demonstration
« Last post by S_Ch_S on Today at 02:27:33 AM »
Thank you for the response, the tank was absolutely not hermetically closed, and the 12V electrolysis of sodium chloride infused water was happening for 3hrs. After I turned it off it broke. Any logical explanation? It was a thin and long tank but its top side was completely open.
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Undergraduate General Chemistry Forum / Re: Reverse Diffusion Demonstration
« Last post by Corribus on Yesterday at 08:51:57 PM »
If the tank was hermetically sealed and it is not pressure rated, then, sure, gas generation at the electrode could certainly cause failure.
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Undergraduate General Chemistry Forum / Re: Reverse Diffusion Demonstration
« Last post by S_Ch_S on Yesterday at 06:25:27 PM »
May I ask something: I did the sodium chloride infused water electrolysis in a self-built thin and long water tank for about 3 hours and after I turned the voltage (12V) off, my glass water tank broke. I didn't see how this happened but I found it broken 5 minutes after I turned the voltage off. Any explanation on this? Was the hydrogen product trapped in the water tank but which other factor contributed to this? Thanks!
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Biochemistry and Chemical Biology Forum / Re: Glucose Mutarotation
« Last post by Babcock_Hall on Yesterday at 09:55:26 AM »
https://cdnsciencepub.com/doi/pdf/10.1139/v73-085#:~:text=The%20mutarotation%20of%20glucose%20is,is%20not%20known%20with%20certainty.

You have asked more questions than I can answer.  The beta-anomer is only slightly more stable than the alpha-anomer; therefore, the equilibrium between them is only about 64:36.  Regarding rates of reaction in water, specific acid catalysis is the speeding up of a reaction due to protons.  The definition of specific base catalysis is analogous.  General acid catalysis is the speeding up of a reaction in the presence of a weak acid at constant pH, and the definition of general base catalysis is analogous.  The paper above may answer some of your questions.
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