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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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Is it possible to roughly determine the type of rubber used in a rubber band?

Based on basic observations and tests and no prior knowledge of the manufacturer, is it possible to determine (or at least make a rough prediction) what types of rubber were used to make a given ...
0
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2answers
35 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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1answer
38 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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2answers
105 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
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1answer
38 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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1answer
118 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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0answers
76 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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0answers
77 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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0answers
81 views

Identification of compound of potassium and oxygen based on flame color

When a flame test was carried out on A, it gave a lilac flame. Also, a glowing splint was re-lit during testing. This assumes that the substituents of the compound are potassium and oxygen. Identify a ...
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0answers
77 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 ...
1
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1answer
3k 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 ...
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0answers
31 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,...
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2answers
97 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 ...
2
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1answer
253 views

Home test for magnesium carbonate

People that do rock climbing and weightlifting usually use magnesium carbonate on their hands to decrease slippery hands. I would like to know how can someone that buys MgCO3 can really be sure it's ...
5
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1answer
375 views

What's the chemical formula of “Everitt's salt”?

According to my school textbook (which is notorious, for being in possession of several errors), a certain "Everitt's salt" is a complex that results from the reduction of Prussian Blue. Everitt's ...
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2answers
84 views

Identification of a metal from group 2 [closed]

A chemist adds $\pu{0.115 g}$ of a group 2 element to water and the resulting solution is made up to $\pu{400 cm3}$ by adding distilled water. The equation for the reaction is shown below. $\ce{M}$ ...
2
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1answer
87 views

What is this glassware between flask and condenser to collect liquid?

I've been trying to identify this piece of glassware for ages now. I've been combing the internet and can't seem find anything similar. It looks like some kind of adapter/collecter/trap that sits on ...
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1answer
115 views

Identification of an aromatic compound for a quiz [closed]

I need help identifying this structure for a puzzle. Original text was blurry, so a white overlay was added for readability, though some fragments might be different. Any help or suggestions are ...
10
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2answers
187 views

Brass Instrument: Dezincification or just scrubbed off?

I do own a brass instrument (a trombone). The lacquer is damaged. I asked how to deal with it here. Now I learned that the brass contains zinc, and there is a corrosion process called "...
3
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1answer
80 views

Strange green and gold coloured chemical [closed]

I have a reagent bottle with an unknown chemical that came with some other lab gear about 30 years ago, I stumbled on it again when clearing out some old stuff. It is a standard brown glass Merck of ...
1
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0answers
58 views

Whats the full name of HMOBA? [closed]

I'm doing some statisitcal research and I have come across an acronym for a chemical. I have tried googling it but it comes up with very little and I can't find the name. I only have HMOBA. Can ...
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1answer
72 views

What molecule is this? [closed]

I have tried some only searches but I couldn't find the molecule name. Can someone identify this for me?
2
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1answer
87 views

How to differentiate magnetite from metallic iron?

Both metallic iron and magnetite, $\ce{Fe3O4}$, are magnetic. Now, iron is grey in color, whereas hematite is black, so that they can be distinguished visually. Now, I have a powdery mixture of iron/...
2
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1answer
47 views

Structure of compound

The synthetic scheme below makes reference to a reagent $\ce{(CH_3)_3COCl}$ that is added at some points in the synthesis. What kind of structure does $\ce{(CH_3)_3COCl}$ have? The closest ...
4
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0answers
59 views

Can anyone explain this condensation pattern?

What is the hair-like polymer that condenses on the caps of the plastic cell vial? Inside vial are cells in a mixture of FBS and DMSO. The vials were frozen slowly in a special isopropanol-filled ...
5
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0answers
59 views

Fractal patterns on water

I stored water in a bucket (of aluminium probably), and some random fractal-like patterns are formed on the water: See here for some more pictures. Why this happened? I'm unable to reproduce it. ...
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1answer
142 views

Rubber composition A13 B13 C20 F17 K11 L14 [closed]

I am looking at a rubber compound with the following description: A13 B13 C20 F17 K11 L14 I cannot find the meaning for "A" and "L". I am not a chemist.
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1answer
1k views

Identification: was this gallium or mercury from broken thermometer?

I had accidentally broken a thermometer against my computer screen, resulting in the splash of the silvery substance seen below: I cannot remember whether the thermometer is a mercury-free ...
3
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1answer
60 views

Help identifying glassware

I am helping clean out my lab and there is some glassware that I can't identify. Attached are the photos: Thank you!
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0answers
241 views

What is the reason that this white substance formed on these coins?

I recently did an experiment where I put lots of pennies, and a few quarters, in a mixture of vinegar and salt for three days. By the end, the pennies were dull in color and the quarters had taken a ...
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1answer
63 views

What is this formula representing?

What is the formula on this cup representing?
3
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1answer
2k views

What is “mineral spirits”?

I'm working in a project, and for a specific thing, I need to work on a possible recovery of $\ce{HCl}$ in aqueous phase. I found a patent on the net in which they use an amine to make a complex with $...
1
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1answer
131 views

Measuring pH using pH paper makes solution change color

I have an unknown substance dissolved in water, and it's milky white. When I put in a pH paper, the paper shows that it is slightly basic at pH ~8. However, after putting in the pH paper, the solution ...
3
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1answer
80 views

What are the uses of ethyl phthalate

The last time I went to my junior college I remember seeing huge blue colored drums labeled ethyl phthalate. So just out of curiosity I decided to check upon this compound. Wikipedia entry containes ...
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4answers
3k views

Identify a molecule by structure

I have a drawing of a molecule, I want to know its name. Is there a software, or website that can help me identify the chemical? Im not a chemist, its been a decade since I had chemistry in college, ...
0
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1answer
202 views

Which white powders form acids when mixed with water?

I have a mystery acid which isn't citric, boric, or oxalic acid. When mixed with water, it smells pungent, like hydrochloric acid--though I haven't compared them side by side. Which other white ...
9
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2answers
3k views

What is this blue crystal?

I was sorting out some old boxes in one of the rooms in my house, when I found a small container with about 10 grams of this blue crystalline powder. I assume that it contains some form of copper due ...
10
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3answers
577 views

What metal is this?

Does anyone know what metal this is? (right click -> "Open image in new tab" for larger image) It has to be one of the following: magnesium, aluminum, zinc, tin, antimony, lead. This metal was found ...
3
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2answers
479 views

What goes on the NFPA 704 for multiple chemicals?

If you have a chemical that is classified (Health, Fire, Reactivity) 2, 1, 2. And another chemical that is 1, 3, 2. If these two chemicals are stored together, what is put on the storage container/...
6
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1answer
849 views

Finding the mystery ester strucuture using NMR

I have an unknown ester with the chemical formula $\ce{C9H10O2}$ that is used as a flavoring agent in candies. It exhibits the following H-NMR and C-NMR (Attached file: unknown ester NMR) Based on ...
0
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1answer
69 views

Unknown salt formed from electolysis of urine

I'm not sure what I was expecting to happen with this but I created a circuit to electrolyze various household liquids. My electrodes are copper (or at least claim to be, I think they might just be ...
0
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1answer
2k views

Reaction of copper (II) ion reacting with sodium hydroxide

Based on an experiment, a solution that contained $\ce{Cu^2+}$ formed a precipitate with $\ce{NaOH}$. Is this how you write the equation? $$\ce{2NaOH + Cu^{2+} -> Cu(OH)2 + 2Na+}$$ On the ...
2
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3answers
290 views

Looking for a toxic substance that cannot exist at room temperature [closed]

I am writing a short story, and am trying to find a gas with the following properties: It must have a very distinctive odor It must be impossible for it to exist at room temperature under normal ...
0
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0answers
69 views

Differentiating glycerol and glycols

I have a sample of some unknown viscous liquid, obtained from a pharmacy, labeled as "glycerine". However, it did not freeze in a freezer (freezer was at around -4 Celcius), even when touched with a ...
5
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1answer
878 views

What is “Cresol Soap”?

I recently came across a suggestion in an old (first published 1893) book that a solution of ~1% cresol soap in water could be used as a way to store a particular kind of root without allowing it to ...
2
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0answers
455 views

Identity of unknown metal

I wanted figure out what the identity of this scrap metal was. It seems to be some sheet metal but Wikipedia says sheet metal can be made of a variety of metals. My dad said it might be tin so I ...
2
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0answers
86 views

Identifying an unknown white oxidizing powder

I am working with a unknown white oxidizing powder that melts at around 500 degrees Fahrenheit. It turns my finger green when it comes into contact with my finger for a short while. It leaves a very ...
6
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2answers
458 views

Identify two amines

I was reading a random text about the surface chemistry of YBaCuO superconductors. In the text, there was a table. The table had a list of several chemical compounds, including these two: Alkyl Amine:...
4
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1answer
139 views

Volatile (aroma/scent-defining) compounds from Himalayan Balsam (Impatiens glandulifera)?

Has anyone identified the compound(s) that make up the distinctive and intense scent of Himalayan Balsam (Impatiens glandulifera)? I’ve found a number of compounds associated with Impatiens sp., but ...
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2answers
433 views

What compound does this chemical formula represent?

I recently saw this: What chemical does this formula represent?