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Questions tagged [identification]

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

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How to tell the difference between mineral spirits and isopropyl alcohol [closed]

They are both clear liquids, so is there a fairly simple test to determine if a container has one or the other? Maybe by mixing a sample with another chemical and looking for a color change? Thanks!
user3015682's user avatar
8 votes
0 answers
227 views

Mysterious violet-purple compound in "Gerber Method" & "Banana oil synthesis"

During the determination of fat in milk (Gerber method), in a milk butyrometer are mixed milk + $\ce{H2SO4}$ 90% w/w + isoamyl alcohol (isopentyl alcohol) and heating. The acidic mixture separates ...
Stefano's user avatar
  • 109
4 votes
2 answers
283 views

What material is used in coating these aluminum containers for the food industry?

What is the material used to coat (some might use the term 'lacquer') disposable aluminum containers in the food industry? And can it be removed in a safe way (for the environment) with 'home methods'?...
Peltio's user avatar
  • 181
-5 votes
1 answer
177 views

Determine if particles are aluminium oxide

I am getting a white dust in my car, coming from the air vents and landing all over, mostly on the dashboard. After searching about this, it seems that it could be caused by the fins of the air ...
Magnus's user avatar
  • 109
1 vote
0 answers
22 views

Explanation of colours of solder plated copper pads after electrolysing a circuit board in NaCl solution

A last ditch method for identifying connections in a old multilayer circuit board that I have come up with, when you have a spare, is to put the board in salt (NaCl) solution and connect a power ...
REPuzzle's user avatar
2 votes
2 answers
452 views

What compound was drawn on this sidewalk?

A friend found this in the sidewalk of Kent town of Canterbury: What compound is this, and why would its picture be there?
Aleister Tanek Javas Mraz's user avatar
-2 votes
1 answer
72 views

Could you tell me the name of this compound please? [closed]

Could you please tell me make of this compound?
soolbi's user avatar
  • 9
0 votes
0 answers
126 views

Can I use potassium ferricyanide instead of potassium ferrocyanide for the identification of calcium?

I have to perform the identification test of calcium ion in calcium gluconate. I do not have potassium ferrocyanide for the test but I do have potassium ferricyanide. Can I take the ferrocyanide form ?...
jai durga's user avatar
3 votes
2 answers
877 views

How can I test for impurities in my steel wool?

I am trying to purify ferrous sulfate (for some electroplating experiments) and I came up with the following process: Dissolve 200g of iron fertilizer in 300ml of distilled water heated to 54 °C (...
iblue's user avatar
  • 212
2 votes
0 answers
244 views

Is it always necessary to boil off H2S(g) to test for group III cations in qualitative analysis?

When a sample contains $\ce{Al^3+}$ ions (group-III), to test for its presence, before adding NH4Cl/NH3 solution do we need to boil off acidic H2S added earlier to check for the presence of group-ii ...
Sudhagar's user avatar
  • 131
-2 votes
1 answer
141 views

How are substances identified in the real world? [closed]

Recently in AP Chem I did a lab that involved doing various tests (melting on hot plate, flame test, etc.) to identify a metal out of a list of metals. This had me wondering: how do chemists identify ...
jb0's user avatar
  • 336
2 votes
1 answer
87 views

How to identify unknown, insoluble solid with limited resources?

Looking for suggestions on how to identify an unknown white solid we received as a donation. It was originally labeled as $\text{MgSO}_4$, but clearly is not. We suspect it might be $\text{CaSO}_4$. ...
deasmhumnha's user avatar
0 votes
1 answer
2k views

What compounds smell like burning rubber or tar?

Background: A couple of friends of mine live next door to each other in a 10-year old block of flats in London, UK. They say that in the early hours of the morning, a toxic smell appears in their ...
Rocketmagnet's user avatar
-1 votes
1 answer
72 views

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 - ...
AunAun's user avatar
  • 109
1 vote
1 answer
113 views

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 ...
Daniel's user avatar
  • 21
6 votes
2 answers
754 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 ...
Qaos's user avatar
  • 79
2 votes
1 answer
226 views

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 ...
Matthew Christopher Bartsh's user avatar
1 vote
0 answers
146 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)...
adatum's user avatar
  • 119
3 votes
1 answer
174 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 ...
Zenon's user avatar
  • 157
-5 votes
2 answers
100 views

What molecule is this. Pretty sure its not ethanol? [closed]

This is the molecule in question This in advance.
finlay morrison's user avatar
13 votes
1 answer
1k views

Does the largest known cycloalkane contain 288 carbon atoms?

If you Google "largest known cycloalkane", you will find this: The above result came from a random HW-QnA site. From where does the result come from? Similar posts: Largest alkane having a ...
Nilay Ghosh's user avatar
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2 votes
1 answer
1k 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) ...
Wrzlprmft's user avatar
  • 509
-1 votes
2 answers
42 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 ...
harry's user avatar
  • 1,134
0 votes
1 answer
97 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(...
Jay's user avatar
  • 804
5 votes
1 answer
1k 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 ...
Jay's user avatar
  • 804
0 votes
1 answer
274 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 ...
Juan Perez's user avatar
6 votes
1 answer
100 views

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

I took this molfile of benzoic acid: ...
Paul Jurczak's user avatar
2 votes
1 answer
189 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-...
Soham Chatterjee's user avatar
-1 votes
1 answer
293 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{...
Koustubh Jain's user avatar
0 votes
1 answer
49 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?
Doli's user avatar
  • 13
2 votes
2 answers
111 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 ...
colt.exe's user avatar
  • 151
3 votes
1 answer
373 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 $\ce{NaOH},$ $\ce{KSCN},$ ...
Tornado547's user avatar
7 votes
1 answer
197 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 ...
Linus Köster's user avatar
0 votes
0 answers
82 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 ...
Hans's user avatar
  • 1,097
9 votes
2 answers
16k 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 ...
Vamsi Krishna's user avatar
2 votes
1 answer
3k 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 ...
peculiar_potato's user avatar
3 votes
1 answer
2k 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 ...
Jack Thomas's user avatar
6 votes
1 answer
7k views

How to convert 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. One ...
BND's user avatar
  • 392
3 votes
1 answer
933 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 $\ce{HgCl2}$ ...
Chem-Learner's user avatar
6 votes
1 answer
126 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 ...
andselisk's user avatar
  • 38k
1 vote
2 answers
121 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 ...
user avatar
3 votes
1 answer
3k 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 ...
Tapi's user avatar
  • 315
0 votes
1 answer
46 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 (...
FarO's user avatar
  • 175
-2 votes
1 answer
61 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:
IneedHelp's user avatar
  • 107
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 ...
SSimon's user avatar
  • 267
0 votes
1 answer
608 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?
achandra03's user avatar
7 votes
2 answers
176 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 ...
bobsburger's user avatar
1 vote
1 answer
275 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 ...
Aury's user avatar
  • 55
4 votes
1 answer
155 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 ...
uhoh's user avatar
  • 5,822
3 votes
1 answer
322 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, ...
jesse's user avatar
  • 45