October 20, 2019, 07:42:24 AM
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Analytical Chemistry Forum / Re: Is vitamin D radioactive?
« Last post by Rembrandt on Today at 06:32:12 AM »
Great answer, thanks. The quick answer should be yes then ;)
2
It would be good with more details on your compound and the conditions, one possibility would be hexamethyldisilazane or N,O-bistrimethylsilylacetamide. Dimethoxypropane needs acid to react with water?
3
Well then that is the formula you should be using along with the n value given,  to determine the unknown n value.
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Inorganic Chemistry Forum / Re: Silicon allotropes
« Last post by GSRush on Yesterday at 07:49:34 PM »
If you look at the phase diagram - you need a temperature of almost 1200°C to melt your mixture and silicon will crystallize when cooling, and the Li12Si7 phase will solidify at 648°C regardless of the cooling speed (unless the phase diagram for atmospheric pressure is not true). Based on this phase diagram, it is difficult to predict what will happen under HTHP conditions. Zeolite o-Si24 was probably obtained from Na-Si alloy.

Yes, zeolite Si24 was produced from Na-Si alloy.
But I am looking for Li7Si12.
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Thank you, guys! So the strategy is to always simplify/cancel all spectator ions and see who is donating the proton (H+) to whom and who is donating electrons to whom?
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High School Chemistry Forum / Re: Why is hydrogen's boiling point 20 K?
« Last post by INeedSerotonin on Yesterday at 06:09:51 PM »
Yes. A phase change doesn't involve breaking covalent bonds,  only intermolecular interactions.  If covalent bonds are broken, it's a chemical reaction. If you need to explain something about a boiling point,  you have to think about factors that influence the strength of intermolecular forces.

Thank you! ;)
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Thanks!  Which do you think has faster kinetics?
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Organic Chemistry Forum / Re: Sn2/E2 exercise correction
« Last post by xshadow on Yesterday at 04:27:45 PM »
Hi

And what about elimination?

Can E2 occour in a secondary  allylic halides? (I 'll get a conjugated diene)
In the second molecule can I get a mixture of E2 and Sn2 products? (Sn1/E1 product low because I'm using a strong base and nucleophile)
Thanks

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Organic Chemistry Forum / Re: Reaction products
« Last post by AWK on Yesterday at 03:49:39 PM »
Just read your textbook - elimination, addition to the double bond, reduction

In example c, you have two C atoms sp2 hybridization.
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