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High School Chemistry Forum / Re: Doubt plastic rubber
« Last post by jonas8732 on November 14, 2024, 06:56:26 AM »What is the main cause of dryness in plastic and rubber in electronic devices?
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High School Chemistry Forum / Re: Doubt plastic rubber
« Last post by marquis on November 14, 2024, 05:34:52 AM »Quick answer is, if you've got something quick, and cheap, why not try it out? There are many longer answers if you want longer research answers. When you get to that point, let me know.
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Inorganic Chemistry Forum / Re: What is the delta H of this reaction?
« Last post by Stickman712 on November 13, 2024, 10:53:10 PM »Have you tried looking for heats of formation for the reactants and products?The problem is that it seems impossible to find deltaH for the product...
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Organic Chemistry Forum for Graduate Students and Professionals / Re: Extra mass and extra H-1 peak in a synthetic intermediate
« Last post by MOTOBALL on November 13, 2024, 10:32:47 PM »Two suggestions to determine if the additional mass is due to solvent of crystallization,
1) Send a sample for micro-analysis for C, H and P
2) Heat a weighed amount of sample in a vacuum oven overnight at 50-60 deg; any weight loss will indicate a volatile component (solv. of xtlln or a byproduct/impurity).
1) Send a sample for micro-analysis for C, H and P
2) Heat a weighed amount of sample in a vacuum oven overnight at 50-60 deg; any weight loss will indicate a volatile component (solv. of xtlln or a byproduct/impurity).
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High School Chemistry Forum / Re: Luminol + Hydrogen Peroxide Solution not glowing?
« Last post by Maisinxy on November 13, 2024, 10:32:10 PM »UPDATE:
I tried the lab again today with the new tips I received.
I added 0.02g of luminol into 4mL water and stirred it until it was dissolved.
I then added 5mL of 3% and 9% peroxide (I tried it twice with each concentration respectively)
after adding the peroxide, I added 0.25mL CuSO4 and stirred more.
This time, the mixture didnt turn brown, it was a translucent yellowish colour, thoug hti still did not glow or turn into the light blue.
As I said, I tried it twice, changing the concentration from 3% to 9% though both times it didnt glow. Im currently trying to troubleshoot the issue, though I cannot find anything wrong with my procedure.
I may try again tomorrow by adding 1g baking soda (sodium bicarbonate) into the luminol as I have watched some videos, specifically from Nile Red in which he added sodium bicarbonate.
If anyone knows the reason why it still is not glowing please let me know!
I tried the lab again today with the new tips I received.
I added 0.02g of luminol into 4mL water and stirred it until it was dissolved.
I then added 5mL of 3% and 9% peroxide (I tried it twice with each concentration respectively)
after adding the peroxide, I added 0.25mL CuSO4 and stirred more.
This time, the mixture didnt turn brown, it was a translucent yellowish colour, thoug hti still did not glow or turn into the light blue.
As I said, I tried it twice, changing the concentration from 3% to 9% though both times it didnt glow. Im currently trying to troubleshoot the issue, though I cannot find anything wrong with my procedure.
I may try again tomorrow by adding 1g baking soda (sodium bicarbonate) into the luminol as I have watched some videos, specifically from Nile Red in which he added sodium bicarbonate.
If anyone knows the reason why it still is not glowing please let me know!
56
Inorganic Chemistry Forum / Re: What is the delta H of this reaction?
« Last post by Corribus on November 13, 2024, 02:15:04 PM »Have you tried looking for heats of formation for the reactants and products?
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Inorganic Chemistry Forum / What is the delta H of this reaction?
« Last post by Stickman712 on November 13, 2024, 01:51:56 PM »Couldn't find any information about the product.
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High School Chemistry Forum / Re: Doubt plastic rubber
« Last post by marquis on November 13, 2024, 12:51:30 PM »Why do you think the rubber and plastics are drying out? What kind of stuff are you seeing? Thanks.
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Organic Chemistry Forum for Graduate Students and Professionals / Re: Extra mass and extra H-1 peak in a synthetic intermediate
« Last post by Babcock_Hall on November 13, 2024, 09:28:53 AM »Yes the sulfone is easy to make, and a new synthesis also occurred to me as possibly being the better choice. Of course, the same problem may occur twice, whatever it is. BTW we obtained a H-1 NMR of the starting sulfide, and it looks fine. We have not yet tried recrystallization, but my bet is that hexanes or heptane would work.
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High School Chemistry Forum / Re: Doubt plastic rubber
« Last post by jonas8732 on November 13, 2024, 08:21:27 AM »I don't know of an easy-to-find fabric that is good for protecting the plastic and rubber of devices from drying out
I had read on Google that polyester was good
I had read on Google that polyester was good
