Questions tagged [identification]

Questions asking for identification of compounds in photos, by description, or given by a formula.

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Formula of what substance is shown in the clip Disappointed by Electronic? [closed]

I'd like to know the substance (if any) the model of which is shown in the clip Disappointed by Electronic. The following screenshot is taken from the video electronicofficial — Electronic - ...
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Could mixing naphtha-based cleaner and industrial floor cleaner produce hazardous substances?

I work in a car dealership, and the guy who cleans the workshop uses an industrial floor scrubber / vac on the floor tiles. On particularly stubborn oil / soot marks, he uses naphtha-based brake ...
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4 votes
2 answers
691 views

Hypothetical symmetric carbon peroxide

Could a hypothetical carbon peroxide $\ce{C5O12}$ with the following structure (MolView — 3D model) exist, and I what its properties would be (other than decomposing, of course)? I tried looking it ...
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2 votes
1 answer
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What organic molecule, if any, does this diagram represent in Louis CK's "Louie" Season Four, Episode Eleven, just before the six minute mark?

I'm wondering what molecule this is, if any, and whether this molecule is even physically likely or possible. Here is a screenshot of the scene from "Louie" (a hilarious and fascinating ...
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1 vote
0 answers
92 views

Is this plastic clip made of polypropylene or polyethylene?

I am trying to re-attach an automotive clip (painted plastic with a yellow (epoxy?) hard adhesive backing) which secures a trim piece back onto the vehicle's roof sheet metal (unpainted (primed?) area)...
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3 votes
1 answer
133 views

What molecule is pictured on the cover of Dead Sara's album "Ain't It Tragic?"

An album released today by Dead Sara, titled Ain't It Tragic, has a chemical structure on the album cover. Here's a close-up of that structure: As the structure is partially obscured, it's difficult ...
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2 answers
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What molecule is this. Pretty sure its not ethanol? [closed]

This is the molecule in question This in advance.
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11 votes
1 answer
797 views

Does the largest known cycloalkane contain 288 carbon atoms?

If you Google "largest known cycloalkane", you will find this result: For context, there has been discussions on "largest known alkane": Largest alkane having a given alkane as ...
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2 votes
1 answer
374 views

What reaction happens between glucose and ammonium chloride when drying?

I have the following observations: When I put a solution of glucose (80 g/ℓ) and ammonium chloride (20 g/ℓ) in a drying cabinet at 37°C (maybe a bit warmer) a brown substance forms when all (or most) ...
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2 answers
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Ambiguity in the direction of dissolution equilibrium

The following reaction is usually carried out to test for the carbonate anion in an inorganic salt; $$\ce{CO3^2- +BaCl2/CaCl2 -> BaCO3/CaCO3(s) + 2 Cl-}$$ The resulting carbonate is stated to be an ...
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Detection of sulphide in solution also containing sulphate

Question: The reagent(s) that can selectively precipitate $\ce{S^2-}$ from a mixture of $\ce{S^2-}$ and $\ce{SO4^2-}$ in aqueous solution is(are): (A) $\ce{CuCl2}$ (B) $\ce{BaCl2}$ (C) $\ce{Pb(...
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5 votes
1 answer
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Can we use silver nitrate to distinguish between chloride and carbonate salts?

Initially, we are given a solution containing two salts, they can be either carbonate or chloride salts (we do not know their composition initially). Generally, $\ce{AgNO3}$ is used as a confirmatory ...
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1 answer
114 views

Meaning of "Nonyl-phenol 10 mole"

In my workplace we are purchasing "Nonylphenol 10 mole" and "Nonylphenol 30 mole" for use as non-ionic surfactants. At first I assumed, because of the name, that the substance was ...
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6 votes
1 answer
84 views

Are atom coordinates in molfile necessary to produce a valid InChI identifier

I took this molfile of benzoic acid: ...
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1 vote
1 answer
117 views

How to identify the aromatic compound with the sum formula C7H6Cl2?

An aromatic compound (A), $\ce{C7H6Cl2}$, gives $\ce{AgCl}$ on boiling with alcoholic $\ce{AgNO3}$ solution and yields $\ce{C7H7OCl}$ on treatment with $\ce{NaOH}$. (A) on oxidation gives a mono-...
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-1 votes
1 answer
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Why do we need weak or strong acids to displace the anions of other weak acids from salts?

I have already looked at Why does a strong acid displace salt of weak acid? but I couldn't understand the answer and the analogy there. And I mean the above question in the following context : $\ce{...
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1 answer
44 views

What would be the identification reactions of selenate(IV) ion? [closed]

I have not been able to find any $\ce{SeO3^2-}$ identification reactions anywhere. Are there any?
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2 answers
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What's the usual agent added to discourage drinking of hazardous substances

I've once read somewhere that in materials that are hazardous to swallow, a chemical is used in very small quantities to assure any accidental drinker to retch. This also helps to prevent suicide by ...
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3 votes
1 answer
270 views

Identification of aqueous solutions of sodium hydroxide, sodium acetate and potassium thiocyanate using nickel(II)

I'm very new to chem — taking an intro to chemistry course where we are currently focused on substance identification. I have two substances, both aqueous solutions of either $\ce{NaOH},$ $\ce{KSCN},$ ...
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7 votes
1 answer
171 views

Name of this bond-line formula? [closed]

I don’t know much about chemistry but I recently found the below bond-line structural formula painted on a wall near my place. I really can’t let go of trying to find the name of the compound. If ...
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0 answers
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Yellowing/Browning from Mixing Ascorbic Acid with Calcium Carbonate and Glycerol

I slowly get some yellowing / browning upon mixing ascorbic acid with calcium carbonate and glycerol and letting it sit at room temperature over time. At first I thought it was ascorbic acid oxidating ...
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8 votes
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What happens when an alkyne reacts with ammoniacal Cu2Cl2?

My text book provided me with 2 reactions concerning alkynes (Specifically Terminal Alkynes). The first one was the dimerisation of an alkyne on passing it through ammoniacal $\ce{Cu2Cl2}$. All was ...
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2 votes
1 answer
672 views

Is there any easy trick to know if a substance is a Brønsted–Lowry acid or base? [duplicate]

I know that Brønsted–Lowry acids can donate a proton and a Brønsted–Lowry base can receive a proton. I have also memorized the strong acids and bases, which makes it easier to figure out. However, if ...
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3 votes
1 answer
734 views

Identify the structure of compound with C₉H₁₀ formula using IR and NMR data [closed]

Use IR and NMR data to define the structure of the molecule, the formula of the given structure $\ce{C9H10}.$ On what basis do we conclude that its structure is that (the answer) only? On what points ...
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2 votes
0 answers
3k views

CAS id to SMILES

How can I convert a list of CAS ids to structures (SMILES). I have been trying (Chemspider API, PubChem and the chemical identifier Resolver) but there are still some ids I can't find the structure. ...
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2 votes
1 answer
436 views

Why does HgCl2 react with HCO3^- but not with CO3^2-?

I have started learning Qualitative Salt analysis recently. When I was reading about tests to distinguish $\ce{CO3^2-}$ and $\ce{HCO3-}$, I came across a line in a book which states $\ce{HgCl2}$ ...
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6 votes
1 answer
121 views

What is "dithreitol"?

The article by Hu et al. [1] mentions a compound "dithreitol" in the Saliva Proteome Analysis section (emphasis mine): For the "shotgun" approach, saliva samples (1 mL) were pre-fractionated with ...
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1 vote
2 answers
107 views

How can chemists distinguish pure chemical element specimens that look almost "the same" as well as what deposit is what in a multimineral mined rock?

As a non chemist I am most often charmed when visiting Wikipedia articles of chemical elements and see images of very pure specimens of element after element, proton by proton, and often also metal ...
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3 votes
1 answer
2k views

Can 2‐chloropropane and acetyl chloride give the iodoform test?

Can $\ce{CH3-CHCl-CH3}$ and $\ce{CH3COCl}$ give the iodoform test? I thought $\ce{CH3COCl}$ having the keto-methyl group would show the iodoform test, while $\ce{CH3-CHCl-CH3}$ will not since it's ...
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1 answer
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Which compound should I avoid in deodorants to avoid "sticky, unwashable" feeling?

I tried some personal deodorants to avoid the smell of sweat, both in stick, no gas, gas sprays. Some can be washed away easily with body soap on the next day, some require either hair shampoo (...
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  • 175
-2 votes
1 answer
57 views

Identifying molecule with three adjacent six-membered rings from blurry image

I have found this isolated image on one of my old hard drives and I would like to know what molecule does the image represent:
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13 votes
2 answers
2k views

What is this fluorinated organic substance?

The corresponding author of the paper where this formula was published as appendix passed away. Can someone help me with identifying what is the name of this compound and why have strange zig-zag ...
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  • 267
0 votes
1 answer
376 views

Flame test color for non-ionic compounds

What color would a non-ionic compound, such as $\ce{NH4OH}$ or $\ce{HCl}$, produce in a flame test? Is no color produced, or is it different for each compound?
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6 votes
2 answers
145 views

Removing sodium borate for the test proving thiocyanate ions

I've just learned that when carrying out the identification test for thiocyanate ions borax can induce a false positive and therefore needs to be removed. I couldn't find the answer on google so I'm ...
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1 vote
1 answer
180 views

How do I identify the compound(s) that formed from a failed synthesis of another compound?

A general answer to the question is great, but specified to my problem is very much welcomed. My team had a lab project — to synthesize chrome alum crystals. We first dissolved $0.3 \, \rm g$ of ...
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0 votes
0 answers
682 views

Victor Mayer test for 2° alcohol

In the last step in Victor Mayer test for 2° alcohol, why do we need to add an alkali like NaOH? Isn't pseudo nitrolic acid that is formed already blue in colour? What would be the reaction of alkali ...
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4 votes
1 answer
118 views

What gas was produced in this orbiting space-balloon from 33 pounds of benzoic acid and anthraquinone? Why these two chemicals?

As pointed out in this answer, on page 4 of NASA Technical Note TND-1366 The Orbital Behavior of the Echo I Satellite and its Rocket Casing During the First 500 Days (June, 1962) says: PHYSICAL ...
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2 votes
1 answer
220 views

Is there another name for compound "delta-7 sterine", does it exist alone?

Is there a more common name for "delta-7 sterine"? Is this spelled correct? I read all over the internet and this compound exists in many articles, but I cannot find any information on it at all, ...
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0 votes
2 answers
292 views

What are methods of identifying which amino acids are in a sample of protein? [closed]

Are there any methods out there to identify which amino acids are in a sample of protein? Perhaps using NMR?
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11 votes
1 answer
2k views

Formula of Oxone

A problem in my book asked the commercial name of sodium peroxide. The answer given was 'Oxone'. Even the website https://www.911metallurgist.com/oxone/ mentions oxone as sodium peroxide. However, ...
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-1 votes
3 answers
1k views

What is the name of this chemical LiB2PO4H7? [duplicate]

I was recently looking at a chemical equation calculator that balances equations for you. I came across a reaction that I am unsure about, it goes like this: B2H6 + LiH + PO4 = LiB2PO4H7 I was ...
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1 vote
1 answer
150 views

Is my chlorine sample real?

I bought a pressurized liquid chlorine ampoule online and I was surprised how thick it was. It was more like oil than water. Here's a YouTube video showing someone else with a very similar sample. ...
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0 votes
2 answers
257 views

Molecule identification [closed]

I'd really like to know what compound this formula is and don't know if there's any software for that matter, if anyone could help me :) (With a sw suggestion or the compound identification)
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0 votes
1 answer
489 views

Which compound results in the following products when mixed with AgNO3 and Chlorinated water

I'm currently working on attempting to identify a particular substance of which I know the cation is Na, however I am unsure as to what the corresponding anion is based off of these characteristics. ...
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4 votes
2 answers
167 views

Which white powder first "boils off" and then catches fire at high temperatures?

I'm a high school student doing a project where we need to identify chemicals and one of the substances had a very unique change when heated. Before heating it was an extremely fine, flour-like white ...
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0 votes
1 answer
343 views

CAS numbers for salts of molecules

Often times Pharma molecules come as different salts where the Cation changes. Do these have typically the same or different CAS numbers? e.g. Take Glucosamine Hydrochloride. https://en.wikipedia....
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  • 1,498
4 votes
2 answers
504 views

Structure of the compound C9H7O2Cl?

A compound having formula $\ce{C9H7O2Cl}$ (O = oxygen) exists predominantly in enol form (A) and also in keto form (B). On oxidation with $\ce{KMnO4}$ it gives m-chlorobenzoic acid as one of the ...
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  • 185
6 votes
0 answers
274 views

What are metal zip tags and belt buckles made of?

Metal zipper tags and belt buckles melt very easily and can be melted by heating it in the stove for 5 minutes. But other metals like aluminium refuse to melt even after hours. If you leave it ...
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1 vote
0 answers
174 views

White compound, insoluble in water, turns pink and then white again on adding water

Which white, ionic compound(s) that is insoluble in water turns pink when you add only a little of water but white again when you add more water? I know that the cation is one of the following: $$\...
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18 votes
0 answers
405 views

Does CN4 with the following structure exist?

I am a mathematician, not a chemist, so my questions are rather combinatorial. I am intrigued by the possibility of the following binary compound: $$\ce{\overset{-}{N}=\overset{+}{N}=C=\overset{+}{N}=\...
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