Questions tagged [identification]
Questions asking for identification of compounds in photos, by description, or given by a formula.
145
questions
2
votes
1answer
123 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 ...
-5
votes
2answers
85 views
What molecule is this. Pretty sure its not ethanol? [closed]
This is the molecule in question
This in advance.
12
votes
1answer
630 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". There is a related chem.SE question. There ...
2
votes
1answer
224 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) ...
-1
votes
2answers
34 views
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 ...
0
votes
0answers
14 views
Identification of dried oil primer vs. acrylic primer on wooden panel
I am an artist and many years ago I primed a small wooden panel with either oil or acrylic primer. I have since generally noted what type of primer I have used on the backs of canvas stretchers or ...
0
votes
1answer
70 views
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(...
4
votes
1answer
203 views
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 ...
0
votes
1answer
69 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 ...
6
votes
1answer
78 views
Are atom coordinates in molfile necessary to produce a valid InChI identifier
I took this molfile of benzoic acid:
...
1
vote
1answer
102 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-...
-1
votes
1answer
42 views
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{...
0
votes
1answer
38 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?
2
votes
2answers
96 views
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 ...
2
votes
1answer
198 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 $\ce{NaOH},$ $\ce{KSCN},$ ...
7
votes
1answer
160 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 ...
0
votes
0answers
28 views
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 ...
7
votes
2answers
7k views
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 ...
2
votes
1answer
249 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 ...
3
votes
1answer
528 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 ...
2
votes
0answers
2k 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. ...
2
votes
1answer
345 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
$\ce{HgCl2}$ ...
6
votes
1answer
116 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 ...
1
vote
2answers
99 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 ...
3
votes
1answer
1k 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 ...
0
votes
1answer
39 views
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 (...
-2
votes
1answer
56 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:
13
votes
2answers
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 ...
0
votes
1answer
306 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?
6
votes
2answers
122 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 ...
1
vote
1answer
137 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 ...
0
votes
0answers
632 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 ...
4
votes
1answer
112 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 ...
2
votes
1answer
180 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, ...
0
votes
2answers
225 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?
11
votes
1answer
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, ...
-1
votes
3answers
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 ...
1
vote
1answer
140 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.
...
0
votes
2answers
239 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)
0
votes
1answer
362 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.
...
4
votes
2answers
155 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 ...
0
votes
1answer
298 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....
4
votes
2answers
473 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 ...
6
votes
0answers
269 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 ...
1
vote
0answers
152 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:
$$\...
14
votes
1answer
292 views
Does CN4 with the following structure exist?
I am a mathematician, not a chemist, so my questions are rather combinatorial. I am intrigued by the possibility of the following binary compound:
$$\ce{\overset{-}{N}=\overset{+}{N}=C=\overset{+}{N}=\...
1
vote
0answers
795 views
What is causing a blue colour when sodium bicarbonate, vinegar and aluminium are reacted together? [closed]
My 10 year old has been experimenting in my kitchen!
The other day he wanted to know why when he reacted bicarb soda and boiling vinegar in a container with some aluminium foil, the solution turned ...
3
votes
2answers
24k views
Mixing hydrochloric acid and sulphuric acid, both concentrated
In the chemistry lab, I stupidly decided to mix hydrochloric acid and sulphuric acid, both concentrated, in a random ratio, which was about $\pu{50 ml}$.
When I poured them in one test tube, the ...
1
vote
0answers
68 views
Need help with an IR spectrum (polymer identification)
I have been given an unknow polymer and I have to identify it.
DSC measurements showed no glass transition (which means it's below room temperature) and a melting temperature at around 100-120°C. So,...
-1
votes
2answers
169 views
What's this mystery acid? [closed]
Today, my dad told me about a cleaning product for membranes he bought a while ago. He told me he put his finger in it and it didn't hurt him at all, nor did it seem to damage any tissues.
But later ...
