Questions asking for identification of compounds on photos, or given by formula.

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0
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0answers
11 views

Qualitative Analysis of Anions

From the image above, if you all could take a loot at step 1a. It makes no sense to me. I do not understand why adding $\ce{CH3COOH}$ has any effect on the solution whatsoever. What is the point of ...
-3
votes
1answer
47 views

Finding Mass, Density, Volume

I'm a bit confused on how I'm supposed to figure this out when given such limited information. Perhaps one of you could enlighten me. The question is as follows. An 18 karat gold necklace is 75% ...
1
vote
1answer
28 views

Detect Polyethylene

How can we detect polyethylene from a distance? The method should be mobile as I am thinking of employing it a mobile robot. I have no idea about it. Any suggestion or external link would be ...
3
votes
0answers
151 views

Help me to identify the structure of unknown compound from my 1H NMR , 13C nmr and dept 135

I need help to determine the structure of unknown compound from my 1H NMR , 13C nmr and dept 135 spectrum? I am a student and in my organic chemistry class we each had an unknown chemical from ...
9
votes
1answer
79 views

What is involved in this firey demonstration?

In this rather shaky Facebook video (sorry I can't provide a better link), a science teacher takes a burning beaker of something and spills it out onto the floor. It then proceeds to shoot fire out ...
0
votes
1answer
42 views

3rd analytical group of cations

If a mixture of Mn$^{2+}$, Zn$^{2+}$, Co$^{2+}$, Ni$^{2+}$ and Al$^{3+}$ salts is dissolved in water, a white dim solution is obtained. I guess that the aluminium and zinc ions hydrolysed and the ...
2
votes
5answers
386 views

What gas is released during dissolving NaOH

What gas is released during dissolving solid $\ce{NaOH}$ in a high purity water? Water more than 10 M$\Omega$/cm and standard quality $\ce{NaOH}$.
2
votes
1answer
27 views

Salt analysis: Position of lead ion

Why is $\ce{Pb^2+}$ present both in Group I and II of the basic radicals? Is it related to the solubity product of its salts?
6
votes
1answer
142 views

Does fluorescein decompose from long term exposure to light?

I've had about one liter of fluorescein solution setting on the shelf for at least several years and one day noticed that it suddenly lost its characteristic green color. It's now a light ...
0
votes
1answer
30 views

Is it possible to identify the source of a protein hydrolysate [closed]

I have a powder which only declares to be "Protein Hydrolysate" Meaning that the all the protein has been broken down. We've tried to identify the source of the powder with DNA research. But no ...
7
votes
1answer
312 views

What is the white substance left behind after boiling down water

I was boiling down water in a stainless steel pot as an experiment the other day. When the water was completely vaporised, a white substance was left behind on the bottom of the pot. I tried rubbing ...
2
votes
1answer
170 views

Is cyclohexol the same as cyclohexanol?

I recently came across different names for the following compound: Is the IUPAC name for this cyclohexol or cyclohexanol? Is ...
5
votes
1answer
100 views

what is the white fuzz left behind on basement floor after puddle evaporated

My basement is quite dry (knock on wood!). Recently I brought into the basement for the winter a table from outside. The table had some ice stuck to it which I couldn't remove, so I simply let it ...
0
votes
0answers
16 views

Identifying an aerogel like material or similar alternatives

A few years ago I saw this ultralight weight hydrophobic material and I have been trying to discover it's identity. I doubt it was aerogel since it was brought in by a high school student, but I cant ...
3
votes
2answers
119 views

How to get back my beautiful crystals made from iron and sulphuric acid

I have put some old nails and screws in the 30% sulfuric acid to prepare an electrolyte for plating. After some bubbling and horribly irritating smell (probably $\ce{SO2}$), the reaction slowed down. ...
6
votes
3answers
3k views

Which chemical is responsible for making marker ink permanent?

As asked in the question and also, a bonus question: which property of a chemical would make it 'permanent' in terms of markers?
7
votes
1answer
163 views

Scary jelly forming on zinc anodes

I'm continuing with my electrolysis experiments. Over a long time, I seek a perfect electrodes. It seems, that when you pick the right anode and cathode, it might be a lot cheaper than universal ...
6
votes
1answer
428 views

Does knowing the ratio of masses of the elements in a compound lead to the unique chemical identity of the compound?

I was posed this question from a friend, however I am not necessarily sure. I think: yes, because a molecule of any compound is composed of a whole-number ratio of atoms of its elements, per the law ...
9
votes
1answer
1k views

What is C2H5-O-CH=CH2?

Someone painted an original graffiti: source I wonder what kind of reaction was depicted; what's that product substance? The graffiti reads: $\ce{C2H2 + C2H5OH -> C_2 H_5 - O - CH = CH_2}$ ...
2
votes
1answer
2k views

Why is oxygen absorbed in a colorless alkaline solution of pyrogallol and why does it turn dark brown?

I'm reading about recognition and identification of gases. My book says: Oxygen is absorbed in colorless alkaline solution of pyrogallol and turns dark brown? I'd like to know why and how. ...
0
votes
1answer
66 views

What copper oxide is being created upon electrolysis?

Whenever using copper as anode, I end up with cyan dust that doesn't dissolve in water. What's that (presumably) oxide? Is it poisonous? Can I dissolve it in something to perform electroplating ...
0
votes
1answer
53 views

Naming an ensemble of compounds

As part of intern work I am running simulations on a group of compounds, but as it is I have little in the way of O-Chem experience and I wanted to be able to at least get some direction on naming ...
2
votes
1answer
163 views

Identifying 5 unknown substances

Please help me identify the following 5 substances; G, Y, T, L and J G is a white solid which is insoluble in water. Consider the following reactions carried out on solid G. Step 1: Excess dilute ...
3
votes
3answers
124 views

How to read a given chemical formula?

I'm trying to read this chemical formula but I'm a bit confused. I'm hoping that someone could help break this down for me to explain what the various parts mean. Someone purchased epigallocatechin in ...
3
votes
2answers
220 views

How to identify ionic compounds

I have a Chemistry lab in which I must design and carry out an experiment to determine the compound in each of eight numbered vials. Each vial contains one of these ionic compounds: BaCl2 CaCO3 ...
4
votes
2answers
425 views

What substance is used for staining brass?

While working at CNC engraving, I had at my disposal a small bottle of liquid used to stain brass for creating signs etc - engrave a writing, stain the engraving, then grind/polish the flat topmost ...
3
votes
3answers
791 views

How do we actually know the chemical structure of a compound?

If a compound is placed before you and you are asked to determine what it is and what it's structure is,how do you actually do that ? This might be a baby question for most of you but I am not from ...
3
votes
1answer
126 views

What is the best way to detect the presence of tear gas?

I realise that tear gas can be several different things (Pepper spray / CS Gas / CR gas, PAVA, etc) Is there a good way to detect some or any of these in the air? Ideally using an electronic sensor ...
3
votes
2answers
1k views

Electrolysis of molten Calcium Chloride: Identifying the product

I was trying to make Calcium metal by electrolyzing molten $\ce{CaCl_2}$. I used a stainless steel spoon and a thick steel wire as electrodes. Then I attached them to a power supply. I placed some ...
3
votes
3answers
1k views

Presumptive test for modafinil?

Given a sample that is probably modafinil plus common fillers, but could be fake, what reagent tests would best determine whether it contains modafinil? Assume a known-good sample for comparison. ...
1
vote
0answers
90 views

DNA qualitative analysis [closed]

Does DNA give positive tests for: Amides (using Hinsberg , isocarbonyl or any such test) Alcohols Phosphates (using the Ammonium Molybdate test)? I will be extracting DNA from fruits and ...
6
votes
1answer
789 views

Identifying a glass frosting chemical

I have purchased an "unknown" white coloured powder from the market which can frost glass objects. Here are some properties of this powder White in colour When mixed with HCL or water, it results in ...