Questions tagged [identification]
Questions asking for identification of compounds in photos, by description, or given by a formula.
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1answer
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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
60 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
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1answer
65 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 ...
1
vote
1answer
88 views
What emits the least light when hot?
What sudstance emits the least light or radiation when hot with the highest vapor pressure point in a vacuum?
https://space.stackexchange.com/questions/35486/shielding-capability-of-liquid-metals
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0answers
41 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 ...
1
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1answer
50 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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2answers
44 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?
9
votes
1answer
763 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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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
100 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
43 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
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1answer
58 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
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2answers
122 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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1answer
85 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....
2
votes
1answer
220 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
109 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
94 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:
$$\...
1
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0answers
153 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 ...
2
votes
2answers
7k 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
35 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
107 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
votes
1answer
388 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
votes
1answer
503 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 ...
0
votes
2answers
182 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
votes
1answer
99 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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votes
1answer
132 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 ...
9
votes
2answers
324 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
votes
1answer
84 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
vote
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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votes
1answer
83 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
votes
1answer
115 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
votes
1answer
63 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
votes
0answers
68 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
votes
0answers
65 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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votes
1answer
205 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.
9
votes
1answer
2k 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
66 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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1answer
74 views
3
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1answer
3k 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
vote
1answer
157 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
votes
1answer
83 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 ...
3
votes
4answers
4k 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
votes
1answer
429 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
votes
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
votes
3answers
642 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 ...
2
votes
2answers
691 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
votes
1answer
1k 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
112 views
Unknown salt formed from electrolysis of urine
I am 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
3k 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
votes
3answers
318 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 ...
