Everything posted by chenbeier
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Synthesis of CH3O (para thesis) - benzene- CH2COCl
What is CH2COCl C6H6 => C6H5CH3 => p-NO2C6H4CH3 => NO2C6H4COOH => NH2C6H4COOCH3 => HOC6H4COOCH3 => CH3OC6H4COOCH3 => CH3OC6H4COOH => CH3OC6H4COCl
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Synthesis of hooc-ch2-nh-ch3
Maybe can use Strecker Amino acid synthesis.
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Synthesis of hooc-ch2-nh-ch3
CH2CH2 => HO-CH2CH2Cl => ClCH2COOH => ClCH2COOCH3 => CH3NHCH2COOCH3 => CH3NHCH2COOH
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Is 2-hexoxyethanol polar or non-polar?
It is at the limit. Its like a surfactant. The Hex- group is non polar. The oxyethanol is polar.
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mixing coolants
I dont see generally a problem. The main compounds of both coolants are the same. But I would test first a small amount in a beaker to see there is no precipitation. To mix borate with benzoate is maybe a problem.
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Converting Copper sulfate
CuCl is easy. Add sodiumchloride or hydrochloric acid and a strong reducer like dithionite or Ascorbinic acid to the coppersulfate. You will get a white precipitate. Manganesechloride : Add sodiumhydroxide first to manganese sulfate , you will get a sludge of manganese hydroxide. Filter it and wash it. Then neutralize with hydrochloric acid.
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Mystery Carbohydrates??
Of course these are not healthy. I dont think in food toxic carbo hydrats added. I added this post to mention, which compounds fit to (CH2O)n.
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Mystery Carbohydrates??
What about Formaldehyde CH2O, and its Polymers Metaformaldehyd, 1,3,5-Trioxane and Polymethylenoxide.
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Dimethylmercury question.
Don't worry. These compound can only obtained by Grignard Reaction. Mercury is still a noble element and will not react so fast with others.
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Question plastic bag and humidity
Plastic bags made mostly by poly ethylene. This will keep the moisture inside. But if the bag is open you have the same air inside like outside. There will be not more moisture in. But you can add a small bag of moisture absorber silica gel, if you want to close the bag.
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The difference of these two reactions
No it doesnt go homolytic reaction. Electrophil means some attraction to electron rich area. This means electrophil are positive like NO2+, Br+,H+,etc.
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The difference of these two reactions
No, in case of the HBr you get H+ and Br-. These are ions and no radicals . Radicals habe online one unpaired electron. Like Cl2 => 2Cl* In Br- the electron is paired with the one of bromine. 8 electrons in outer shell.
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Help understanding lead migration
The question is how much is 1 sip. 2 mg/l = 2 μg/ml = 0,5 μg/0,25ml So it is less then 1 tea spoon of liquid.
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2004 NECAS Canned Questions
For the first question the acid concept of Brönstedt should be used. According him acids are proton donators. In the given equation is NH4+ / H2O the donators. Bases are proton acceptors. So its NH3 / OH- for base pair.
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2004 NECAS Canned Questions
As mentions in the other forum, what is your own work in this?
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Metal and iron dissolving
Of course all safety measures has to taken in account. Conc. Hydrochloric acid can release HCl gas. The reaction develops hydrogen. Good ventilation is necessary. Also PSA has to be worn. Goggles, gloves, maybe a mask.
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Metal and iron dissolving
Get some heat to it. 40° C. You want to dissolved the whole piece takes some hours.
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Metal and iron dissolving
Any strong acid like hydrochloric acid will do it. But not every metal can be dissolved.
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Saponification without a base/acid
I dont see here a production of glycerin. Only two oils, water and salt are mixed and heated. A yellow dull mixture was formed. There is no separation process to get rid of the fat acids and the glycerin. This needs caustic soda to crack the ester bonds. At the end the whole mixture was put on the skin, not good idea.
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Can someone help me figure out what the noble gas configurations for zirconium and holmium are?
You wrote to much p- Electrons. Look up the total configuration of Krypton and Xenon.
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Which subshell does the 30th electron belong to?
Yes
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Which subshell does the 30th electron belong to?
Nothing will be filled, because copper and zinc individually elements. Copper has stabil configuration 3d10 4s1 and zinc has 3d10 4s2
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Which subshell does the 30th electron belong to?
Electrons are not different, so it doesn't matter if the d Orbitale will filled or the s Orbital.
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Which subshell does the 30th electron belong to?
From Scandium [Ar] 3d^1 4s^2 to Zinc [Ar] 3d^10 4 s^2 the d-Orbitales are filled. So all of them are d- Block Elements. In some cases half shell and very close to full shell s- electrons move to d-block. Consider all have a s^2 shell and free d Orbitals. The 30th. electron fill the d-Orbital Check, chromium, copper and palladium for irregularities.