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Why does silicon tetrafluoride have a higher melting point than sulfur tetrafluoride?

So looking at the Wikipedia pages of sulfur tetrafluoride and silicon tetrafluoride, the melting points are −121 °C and −90 °C respectively, and so $\ce{SiF4}$ has the higher melting point. However, their boiling points are −38 °C and −86 °C,…
Sidd Singal
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Does dinitratomethane exist?

In 2016 synthesis and structure of tetranitratoethane $\ce{C2H2N4O12}$ were reported [1]. Currently (as of 2017-Q4) this is the only dinitrato-carbon compound with the well-established crystal structure and composition: This article also mentions…
andselisk
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Is steric inhibition of resonance or steric inhibition of protonation dominant in o-toluidine?

I wish to know which effect out of steric inhibition of resonance (SIR) or steric inhibition of protonation (SIP) is dominant over the other when comparing basicities of o-toluidine and aniline: Case 1, using only SIR effect We see that due the…
Shrish Shankar
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Copper Chloride: neutralizing and disposal

I plan on etching some PCBs with hydrochloric acid and hydrogen peroxide, which will therefore produce some kind of copper chloride (green color) which is highly toxic if released into the environnement (it may be useful as an herbicide, but I don't…
user51166
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Synthesis Golf VIII: 4,6-Diacetylhygrophorone A12

As usual we are a bit late on this, but here is this month's molecule: which is known as (4​R,5​S,6​R)-4,6-diacetylhygrophorone A12, and is an antifungal natural product isolated from mushrooms of the genus Hygrophorus. As far as I know this…
orthocresol
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Is pyrite (FeS₂) an ionic or a covalent compound?

I have searched all over the web and found a lot of diverse explanations, but none of them are concluding exactly whether $\ce{FeS2}$ (solid - pyrite) is a covalent or an ionic compound. From electronegativity, it should be covalent as the…
jdw
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Etymology of saturation degrees (-ane, -ene, -yne) in aliphatic compounds

I like to know where the names for saturated, unsaturated double, and unsaturated triple bonded aliphatic compounds came from. What is the reason/etymology behind the suffix -ane, -ene, and -yne? I suppose it parallels something like the…
Raphael J.F. Berger
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Applying Huckel's rule to non-planar compounds

Which of the following compounds is aromatic? From the 4n+2 rule, it must be either option 2 or 4. The answer given in my book is option 4. Why? I think It might be due to one being planar and the other not, but to me both seem to be planar. Is…
Suroj Dey
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What's the mechanism of the reaction of (E)-methyl 3-(furan-2-yl)acrylate in acidic methanol?

In the organic chemistry textbook by Clayden et al. they mention that the reaction of (E)-methyl 3-(furan-2-yl)acrylate in acidic methanol yields dimethyl 4-oxoheptanedioate without providing the reaction mechanism and leaving it to the reader to…
Philipp
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Is there a way to "electroplate" wood with copper?

Maybe wood can be coated with copper (II) sulphate first, or roasted in order to form a conductive charcoal (carbon) layer.
HannesH
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Is it correct to say that ethenol is an alcohol?

IUPAC Gold Book defines alcohols as: Compounds in which a hydroxy group, $\ce{–OH}$, is attached to a saturated carbon atom $\ce{R3COH}$. However, Wikipedia says that: Vinyl alcohol, also called ethenol (IUPAC name), is an alcohol. Is…
ttsc
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How explosive is hydrogen gas?

I want to electrolyze water to get oxygen and hydrogen. I want to mix them in a regular balloon and ignite it. How much hydrogen would you need in a 2:1 ratio with air for it to be dangerous? Is this generally a safe experiment?
Friend of Kim
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What are the products of the dissociation of sodium bicarbonate in water? What is the relative pH of the solution?

I had a recent question on a test that asked what the products would be if sodium hydrogen carbonate were dissolved in water. I had a few candidate answers $\displaystyle\ce{NaHCO3 -> Na+ + HCO3-}$, but that one doesn't involve water at…
scrblnrd3
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Qualitative explanation of how COSY works

I think I understand 1D Proton NMR with the Fourier Transform, qualitatively. However, I am struggling to understand 2D COSY NMR. I am stuck on a few things; In 1D Proton FT-NMR, the "Pulse" I understand to be the application of a transverse…
Mark R
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Improving Elephant Toothpaste experiment

we are trying to perform the Elephant Toothpaste experiment involving the reaction of yeast and Hydrogen Peroxide for the students at school. However, the results have been very underwhelming, likely because we have to use the 3% version of Hydrogen…
itsnotme
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