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7 views

Is carbon dioxide soluble in petroleum ether, and why?

I googled it, and I'm finding some forum posts that say no, but no authoritative reference. CO2 is somewhat soluble in water (1.7 g/L at 20°C) and I understand that it's mostly NOT because it forms ...
1
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1answer
12 views

Does CO2 form carbonic acid in the atmosphere?

Since when $\ce{CO2}$ goes into water it makes carbonic acid, then what happens when it rains? Some of the $\ce{CO2}$ in the air joins the rain drop as it falls and while the rain drop falls and ...
4
votes
2answers
12k views

Why does rotating a double bond break the bond?

It is well known that double bonds are "stiff" and make particles less likely to rotate around the bond. But why? What makes it so that the bond has to be orientated a specific way?
1
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0answers
13 views

When alcohol is used to sterilize, what about it changes that it can't be re-used?

I read online that when you use regular household rubbing alcohol to soak something for sterilization purposes, you're then supposed to toss it out. I'm just curious why. Like, as long as there's a ...
1
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1answer
20 views

How to determine if a compound is a strong, weak, or non-electrolyte?

I'm stuck on questions asking whether a given chemical formula is a strong or weak electrolyte in an aqueous solution. I did some research online, but could not get a specific solution that I could ...
0
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0answers
6 views

Vinegar salt reaction to produce acid; does it matter what type of vinegar I use

I am trying to get get hydrogen chloride gas by using the reaction sodium chloride + vinegar = HCl(g) + sodium acetate, does it matter what type of vinegar I use eg apple cider vinegar, malt vinegar; ...
0
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0answers
9 views

Metal nail reaction in wall filler

Please help explain what is happening to this nail. It has been in this wall filler for a good few months. The substance being excreted was rising up forming these stalagmites, with a liquid forming ...
0
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0answers
5 views

What is the N factor of sulphur trioxide and sulphur dioxide in various reactions

As such i got my concept clear in case of redox reactions , but i fail to find n factor for non redox reaction specifiallyin case of SO2 ,SO3 , where i used the total.+ charge or total - chrge concept ...
0
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0answers
19 views

Is it possible to make micelles to pick up Microplastics from water?

I'd like to know if I could get micelles to pick up microplastics in water. I read that microplastics are sometimes charged, so can we make the lyophobic end to pick up microplastics, so that they can ...
0
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0answers
3 views

Calculate protein concentration based on Lowry assay

Calculate the UNKNOWN protein concentration based on Lowry assay method. A standard curve was plotted and the amount of protein added in the unknown protein concentration was calculated based on abs ...
0
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0answers
4 views

SN2 reaction on a chiral carbon atom

What would the mechanism for the treatment of a chiral carbon atom in an SN2 reaction be like. And can you please explain SN2 reaction briefly Thank you
-1
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1answer
32 views

Constant Pressure and Temperature during Phase Change

One of the solution guides to a question I was working on said that pressure and temperature is constant for a phase change. I understand why temperature is always constant for a phase change, but don'...
0
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0answers
8 views

Do glow sticks that emit high frequency light require higher activation energy when compared to low frequency light glows sticks?

I realized how people investigate glow stick kinetics using an Arrhenius plot, and was wondering whether a relationship between the glow stick light frequency and its activation energy has been ...
1
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0answers
27 views

What reactions involving hydrazine, dinitrogen tetroxide and possibly a contaminant can produce a salt?

Hydrazine $\ce{N2H4}$ and dinitrogen tetroxide $\ce{N2O4}$ form a hypergolic fuel and oxidizer pair widely used in spacecraft including Akatsuki. Wikipedia states: Hydrazine can be monoprotonated ...
0
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0answers
21 views

What is $\ce{NHO3}$?

Are $\ce{HNO3}$ and $\ce{NHO3}$ the same compounds? If not, what are the differences between them? If so, is one order preferred over the other? Are both acceptable?
0
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1answer
639 views

How was water formed if oxygen and hydrogen exist as molecules?

I have learnt that both hydrogen and oxygen exist as molecules. If so how was $\ce {H2O}$ formed? In water there is two hydrogen molecule and one oxygen atoms but how is this possible? Oxygen only ...
1
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0answers
18 views

What will be produced when sucrose and potassium bitartrate react with each other?

What would happen if sugar and cream of tartar react with each other? Would it create an ester? $$\ce{KC4H5O6 + C12H22O11 -> KC16H21O14 + 3H2O}$$ Is this correct? If not, why?
24
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6answers
970 views

Why are equations of state for a non-ideal gas so elusive?

The ideal gas equation (daresay "law") is a fascinating combination of the work of dozens of scientists over a long period of time. I encountered Van der Waals interpretation for non-ideal gases ...
1
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0answers
7 views

Making Lyophilized Cake Lookalike using household ingredients

I'm working on a machine learning model to identify flaws in vaccines in lyophilized cake form. To train the model, I need a number of samples that look something like this: I have vials, but I'm ...
0
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0answers
23 views

Do glass and plastics NATURALLY crystallise at STP? [on hold]

Diamond, being a higher energy state, convert very slowly to graphite, which is stable at STP. Similarly, do glasses (tempered glass, glasses in lenses etc.) and plastics which are amorphous become ...
1
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0answers
13 views

styrene confusion

I am studying NMR and while looking at styrene, I can't figure out why the two hydrogens on the terminal double bond are not equivalent. Is it because one is closer to the ring in position than the ...
2
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0answers
40 views
+50

What are the degrees of freedom that define the temperature of an ionic solid (such as sodium azide)?

Degrees of freedom describe the different ways atoms move in a sample. For a pure ideal gas made of non-linear molecules, there are 3N degrees of freedom (N is the number of atoms in the molecule), 3N-...
10
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1answer
1k views

Birch reduction of anisole

Hepworth, Waring and Waring (2002) mentions that: In general, electron-withdrawing substituents make the arene more susceptible to reduction, while the opposite applies for electron-donating ...
-1
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0answers
10 views
1
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1answer
29 views

Thermal decomposition of K2CO3

K2CO3 doesn't boil - it thermally decomposes at 1200c. However, I find conflicting information online about this. Roughly what I have found say three inconsistent things. (1) It doesn't decompose (...
0
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0answers
9 views

When is the concentration in which you put into the equilibrium constant equal to 1 for solids and liquids?

There are many websites which states that pure liquids and solids have a concentration equal to one, but for some equations they are not! How do you explain the difference for this equation? For the ...
-1
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0answers
28 views

How high can compression be in a combustion engine? [on hold]

In order to make combustion engines more efficient by increasing compression I wonder how high compression can be in a combustion engine. Could solid combustibles, like gun powder and similar, be ...
-2
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0answers
9 views

What is the product : Reaction of 2,2-dibromopropane with alcoholic KOH [on hold]

What will be the product : Reaction of 2,2-dibromopropane with alcoholic KOH .
1
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0answers
13 views

Will distillation do the job of purifying the water?

I asked about my sophisticated water purification system for a generation ship on Worldbuilding Stack Exchange, and somebody mentioned this: If you're gonna go to all the trouble of distilling it, ...
2
votes
1answer
49 views

Application of Nernst Equation in Potentiometric titration of Fe2+ with Ce4+

It is well Known that to find $E_{cell}$ during titration of $Fe^{2+}$ with $Ce^{4+}$ we consider 3 domains: Before Equivalance point , $E_+ = E_{Fe^{3+}/Fe^{2+}}^o+\frac{RT}{nF}log\frac{[Fe^{3+}]}{...
10
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1answer
1k views

Will Proving or Disproving of any of the following have effects on Chemistry in general?

I am working on a project relating to- https://en.wikipedia.org/wiki/Millennium_Prize_Problems I wanted to list the effects of them being proved or disproved in different aspects of science and maths....
-1
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0answers
9 views

Predominating species in a solution

My question is When ferric oxide Fe2O3 is dissolved in 6M HNO3, which iron containing species predominates in solution?
-2
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1answer
29 views

Breast milk with reverse osmosis

I would like to make life lasting breast milk jewelry. I would need at least 5ml to make it. I've been doing a lot of research to get the best results, so far this questions are the result of more ...
8
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2answers
684 views

Strange Sticky Substance on Digital Camera

I purchased a used Canon Powershot A1100 IS camera online. When I received it in the mail it had a very strange sticky substance that looked like a thin film. It resisted attempts at cleaning. Water, ...
1
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2answers
76 views

Thickening and/or slowing evaporation of IPA-based ink

The conundrum I have a security printing ink that I make by adding an IR-absorbing dye to a 50/50 mix of Isopropyl Alcohol and distilled water. The ink solution is pale green but dries virtually ...
-2
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0answers
24 views

Do formulas to find number of nodes applies to all degenerate orbitals?

total number of nodes $= n-1$ number of angular nodes $=l$ number of radial nodes $= n-l-1$ for example: for $\mathrm{4p}$ total nodes $= 4-1= 3$ no. of angular nodes $= l= 1$ radial nodes $= 2$ ...
0
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0answers
24 views

Hydrogen bonding in o-nitrophenol versus o-nitobenzoic acid

p-nitrophenol is more acidic than o-nitrophenol because of hydrogen bonding in the latter. If I apply the same logic, then o-nitrobenzoic acid should be less acidic than p-nitrobenzoic acid. However, ...
3
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2answers
749 views

SMILES for functional groups

Does a resource exist that has the SMILES formula of the generalized pattern that represents the group? For instance: I have the Aldehydes group, which has the pattern: ...
0
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0answers
6 views

Boys-Bernardi counter poise calculation [on hold]

can someone tell me how to do a Boys-Bernardi counter poise calculation through the CPMD program. thank you.
24
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1answer
2k views

Why do the atoms in molecular models have the colors they have?

Molecular models are a great tool for visualizing a molecule in three-dimensional space. These models even appear on the web (practically every chemical's Wikipedia page), and there is a very specific ...
0
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1answer
36 views

Bohr's postulate of quantisation of angular momentum

The Bohr's postulate of quantisation of angular momentum can be written in a formula as $mvr = nh/(2π)$ where $m$ is mass of electron $v$ is its velocity $r$ is the radius of that shell $h$ is ...
0
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1answer
28 views

Bromination of an alkene in presence of water

Bromination of an alkene in presence of water results in its mechanism in a cyclic bromonium ion and "afterwards $\ce{H2O}$ binds to the carbon atom surrounded by more electron donating groups." This ...
7
votes
1answer
100 views
+100

Activators for non-sulphide compounds in froth floatation

I was recently studying about Metallurgy. Concise Inorganic Chemistry by J. D. Lee claims the process of froth floatation can also be applied to non-sulfide ores such as Malachite ($\ce{CuCO3.Cu(OH)...
1
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1answer
80 views

Which of the resonance structures is more stable?

I am quoting a rule on resonance from Organic Chemistry by T.W. Graham Solomons, Craig B. Fryhle, 12th edition, page 25. Structures in which all the atoms have a complete valence shell of ...
2
votes
1answer
514 views

Reaction of aqueous sodium carbonate with aluminum foil

Aqueous sodium hydroxide is known to react with aluminum foil in an exothermic, hydrogen-gas releasing reaction like $$\ce{2NaOH(aq) + 2Al(s) + 2H2O(\ell) → 2NaAlO2(aq) + 3H2(g)}$$ However, on ...
0
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0answers
14 views

Can classification techniques used for identifying solids be used to identify precipitates?

I am preparing for an assessed practical experiment where an unknown precipitate must be identified. I know that precipitates are insoluble, and my textbook says they are considered to be solid with ...
-2
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0answers
25 views

Determinig the mass of a third isotope [EASY] [on hold]

I am totally new to Chemistry. I am taking my first Physical Chemistry course. And in the exercise sheet i am solving there is the following question : There are three Oxygen isotopes, occuring with ...
-1
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0answers
17 views

Free aldol addition and condensation [on hold]

Just had some questions I'm working on that I'd like some help with; what is the mechanism with arrows for the base-catalysed aldol addition and condensation of ethanal with itself (with both steps). ...
1
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0answers
38 views

Is propanol 1-2 diol 178 the same as propylene glycol?

I clean vinyl records in an ultrasonic vinyl record cleaning machine the manual states it uses propanol 1-2 diol 178 as a surfactant. I think this is the same chemical as propylene glycol. Is it? ...
1
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0answers
17 views

Is there a heatformed vinyl-like plastic that is hard as shellac when cold?

I recently started collecting shellac records, and got the idea of releasing my own music on 78rpm shellacs. But the exact formulas and techniques for making shellac records seems pretty much lost to ...

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