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votes
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37 views

Stability of butene

Why is isobutene (2-methylprop-1-ene) more stable than cis-2-butene ((2⁠Z)-but-2-ene)? I can't find a reason as both of them have the same number of alpha hydrogens.
0
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0answers
17 views

What is a good substitue for monoethanolamine in creating conductive silver nanoparticles?

In this paper (https://pubs.rsc.org/en/content/articlepdf/2017/ra/c7ra05125e) and a few others, chemists create PAA-coated silver nanoparticles in a colloidal conductive ink. (Mods - I cant seem to ...
4
votes
1answer
66 views

Fractional index in a chemical formula of metal oxide

I have just read an article in which they used $\ce{WO3}$ and $\ce{WO_{2.9}}$ as precursors, whose objective was to form $\ce{WS2}$, in an atmosphere of argon by CVD. In one boat there is the powder ...
-1
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0answers
48 views

How do we calculate the force of a kinesin molecule? [closed]

In a physical chemistry book, we learn how to calculate the force of lifting yourself up against gravity. The force is equal to the body mass times gravitational acceleration. Then in the next problem ...
-1
votes
1answer
39 views

How can I redisolve and remove hardened baking soda [closed]

I have used baking soda in a commercial sprayer tank, and regretfully did not drain it out in a timely manner. I dissolved it once but then it re-hardened into a solid lump (about 2 inches thick). I ...
-1
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0answers
43 views

How can the rate of reaction between thiosulfate ion and acid be calculated as v = 1 M/Δt? [closed]

The experiment is done in the following way: Sodium thiosulfate is added in a beaker (the concentration is noted). Acid is added (the same amount each time). Time is taken till the reaction reaches ...
-3
votes
1answer
34 views

Why conjugate base/acid needed in buffer solution? [closed]

If I talk about the CH3COOH,CH3COONa acidic buffer solution , CH3COOH --> CH3COO- + H+ Why the conjugate salt is needed ?? Why it can't be like that the addition of extra H+/OH- neutralizes by ...
-3
votes
1answer
36 views

Dilution of Ca(OH)2 and its pH [closed]

A basic solution of Ca(OH)2 was diluted until a final concentration of 10^-9 M. What is the pH?
-2
votes
1answer
35 views

UV of product vs UV of reactant for a diels alder reaction [closed]

I am really stuck on how to interpret the change in wavelength and absorbance of my synthesized product and comparing it to the given UV of the reactant. I am supposed to include the shift in ...
-1
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0answers
27 views

Characterization of amorphous compounds [closed]

I need to characterise my dried precipitate, dried at temperatures between 100-120 deg cel, for various samples. I use Match! software by crystal impact to analyse XRD raw files. The problem is that, ...
-2
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0answers
18 views

Effect of shock waves on the chemical evolution [closed]

How do the shock waves affect the chemical evolution of interstellar medium or circumstellar medium of evolved stars etc?
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0answers
34 views

Charge and Discharge of a Battery [closed]

I'm a student who majors Chemical Engineering. I just have a question shown as below. First of all, I don't understand the answers of both 1) and 2). In my opinion, the answers should be switched. ...
-3
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0answers
34 views

Orientation of Nitro group w.r.t aromatic system [closed]

How do I know about orientation of nitro group with respect to aromatic system.
2
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0answers
44 views

How to obtain the linear form of Redlich Peterson isotherm model by algebraic transformation or any other ways? [closed]

The Redlich Peterson isotherm model is known as: $$ \begin{aligned} q_e=\frac{AC_e}{1+BC^g_e} \end{aligned} $$ Is there any way to obtain the linear form of this equation by algebraic transformation ...
0
votes
1answer
23 views

PdPS interlayer distance [closed]

PdPS is being considered as a layered material but when I look at its crystal structure it does not look like that. Fo example I could not figure out its interlayer distance. Does anyone familiar with ...
5
votes
1answer
1k views

Strong exothermic mixing of two 'safe' liquids

I have read (thanks to Stack Exchange) that mixing water and sulfuric acid is exothermic, as is NaOH and HCl. Are there two 'safe' liquids that can be mixed and produce anywhere near the same amount ...
0
votes
2answers
51 views

Memory foam chemicals from pillow spoiled bed and rendered it useless [closed]

I have recently purchased a memory foam pillow and in two days i ve experienced breathing problems and stomach problems and eyes irritation due to the harsh toxins in it and I returned the memory foam....
-1
votes
1answer
43 views

Sodium hydride 60% dispersion in mineral oil [closed]

I've got a bottle of sodium hydride 60% dispersion in mineral oil. It's not "in mineral oil" it's just powder with an oil coating. I'm using it in an inert reaction, is there a way to remove the oil?
2
votes
1answer
56 views

Is the speed of sound the fastest rate that a chemical reaction can progress through a substance?

I read that a martensitic transformation can travel at the speed of sound in that material. Is that confirmed as being the fastest speed of a chemical reaction (transformation)?
-2
votes
0answers
21 views

What example may there be that demonstrates an anion who's atomic radius becomes greater than 100% of it's non-ionized form? [closed]

This question is in regard to the idea of nuclear efficiency charges of atoms. If an atom loses electrons, it's volume reduces. The reduce in it's volume has limits and will not go below a certain ...
2
votes
1answer
40 views

Reason for double acylation of ferrocene only occurring with certain reagent combinations

Can anyone explain why the acylation of ferrocene produces the following results: Ferrocene + acetic anhydride + AlCl3 ==> mono-acylated ferrocene but: Ferrocene + acetyl chloride + AlCl3 ==> di-...
-1
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0answers
22 views

Could Nanorobots use DNA base pairs to execute actions? [closed]

I just started researching the nanotechnology field, including current research, what the holy grail of nanotech looks like and what are the limitations with todays technology. It would be very ...
0
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0answers
21 views

Is Gibbs energy minimized for processes at constant temperature are pressure only?

I've had this doubt for quite a while, This link https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Map%3A_Physical_Chemistry_for_the_Biosciences_(Chang)/04%...
-1
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0answers
15 views

Glucose oxidase calculation for Biosensor film? [closed]

I am trying to immobilize glucose oxidase (GOx) on a thin film. However, before doing that I need to make necessary calculations. According to given data on Sigma out GOx from Aspergillus niger has a ...
0
votes
2answers
103 views

Solubility Of Benzoic Acid [closed]

Why is benzoic acid well soluble in benzene (and other unpolar solvents, see e.g. wikipedia). What causes the hydrogen bonds in the solid to break? Something (i.e. polar and ionic substances) is ...
0
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2answers
39 views

Can I determine the rate law order from stoichiometric coefficients?

I've read in two books, and seen in three separate videos courses, that you cannot determine the rate law order from stoichiometric coefficients. Then, I have seen homework and "practice" problems ...
-2
votes
2answers
41 views

Confusion in half filled or full filled electronic configuration

At the end of electronic configuration, we were taught that, electron orbitals are most stable when they are either fully filled or half filled. E.g., the final valence configuration of chromium is $\...
2
votes
0answers
9 views

hydrodynamic thickness of polymer vs. concentration of electrolyte?

I've measured the hydrodynamic thickness of a NaPSS layer on polystyrene latex and plotted it against the concentration of the supporting electrolyte, NaCl. My graph shows a general decrease in ...
0
votes
0answers
17 views

Does PEO particle size decrease when dissolved in water?

I am looking to make metallic ink for inkjet printing and using PEO 1 wt% (MW ~600,000) as a binder. The print head I am hoping to use has a nozzle diameter of 80 microns. The metal powder dispersed ...
-1
votes
1answer
63 views

Good books/advice for reaction design [closed]

I'm a postgraduate doing a masters by research and I'm for the first time designing my own experiments but don't know where to start. Solvent choice, solvent, substrate ratio and catalysts for ...
-3
votes
0answers
39 views

COT molecule and aromaticity [closed]

Why is COT molecule anti aromatic eventhough it satisfies Huckles rule (4n+2)pi electrons for aromaticity but its dianion or dication is aromatic?
-1
votes
0answers
46 views

Can hybrid orbitals be broken into components?

For example, can we say in $\mathrm{sp^3d}$ hybrid orbital the equatorial orbitals are mostly $\mathrm{sp^2}$ and axial orbitals are $\mathrm{p}_z\mathrm{d}_z^2,$ thus axial bonds are longer and ...
2
votes
0answers
28 views

Why can zwitterions be difficult detect by HPLC-MS?

I understand that to separate molecules by HPLC (or SFC) you commonly adjust the pH of the mobile phase to get preferable charges (i.e. negative charges) on the molecules - so that they interact with ...
-3
votes
0answers
25 views

What are some good dissertation topics in biochemistry (post graduate level)? [closed]

We have to write a dissertation on a topic based on current research works. It is not lab based, I just need to find papers of the topic, understand them and write the dissertation down. It is like a ...
5
votes
2answers
93 views

Is there any way to chemically check sweetness level in any drink or water or tea etc?

I was wondering if there is a test or way to find out how sweet any drink is? For example, if I mix sugar in water, how can I test its level or number of sweetness?
2
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0answers
19 views

How to extract force when the center of mass of molecules is put in the box in GROMACS?

To extract the force as in the title I used the gmx trjconv command like below. ...
0
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0answers
29 views

Will cooking destroy cucurbitin?

I'm curious whether cooking a food containing cucurbitin (an amino acid found in plants related to cucumbers) will destroy it. More specifically, will roasting pumpkin seeds result in significant ...
2
votes
0answers
30 views

Are there many examples of stable, well characterised organometallic compounds of saturated hydrocarbons with beta hydrogens?

One of the first things you tend to learn in organometallic chemistry is that transition metal compounds containing beta-hydrogens are unstable (there are plenty of stable main groups ones; eg ...
-3
votes
0answers
33 views

Is menthol in aqueous solution acidic or alkaline? [closed]

I was wondering whether the menthol added in common "mint based" chewing gum has a potentially acidic nature. I can't seem to find any answers for this via a web search.
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0answers
49 views

Looking for a fluid that is safe, inert, and doesn't evaporate at room temperature

In the lab where I work undergraduate research, we have several engineering demos. One demo includes a pump system that draws fluid from an open air basin and deliberately leaks said fluid back into ...
1
vote
0answers
23 views

When and how do mineral chelates separate in the body?

If one consumes an amino acid chelate such as iron bisglycinate, it is generally absorbed intact as far as I am aware. At some point, presumably the iron could be used for say hemoglobin synthesis and ...
-4
votes
0answers
213 views

The number of non-bonding electrons present in the frontier molecular orbitals of HF? [closed]

(a)10 (b)4 (c)6 (d)8 I don't understand the word frontier molecular orbitals. And also how the answer is 4.
3
votes
2answers
47 views

Where do the percents in empirical formula questions come from?

A typical empirical formula problem reads something like this: Determine the empirical formula for a compound that contains 35.98% aluminum and 64.02% sulfur. source How would those percentages be ...
7
votes
1answer
110 views

How to obtain curve energy and non-bonded interaction parameters (e.g. Lennard Jones parameters) with Gaussian?

I am parameterizing a force field and would need to obtain non-bonded interaction parameters of atoms (e.g., Lennard-Jones parameters). My primary idea is to obtain a potential energy curve using the ...
-1
votes
0answers
39 views

Free electrons of the wire in a galvanic cell [closed]

In a galvanic cell, do the free electrons contained inside of the conductive wire actually flow since a voltage is created across the wire, or is it just the electrons produced by the redox reaction? ...
2
votes
0answers
49 views

Is there a list of must-have columns for LC-MS/MS used in biochemistry/clinical lab setting?

Considering a wide variety of chromatographic columns used for (U)HPLC based on phase type (normal or reverse); column dimensions (geometry, length, inner diameter); particle material $(\ce{SiO2},$ $\...
0
votes
1answer
34 views

How to calculate the concentration of a solution [closed]

So I’m trying to calculate the concentration of a solution made by mixing a powder with water. Concentration = mass(powder) / total volume of solution Total volume of solution = Volume(water) + ...
0
votes
1answer
39 views

Determining sulfate content in Mohr's salt

I am practicing problems for my chemistry test and I am stuck on the following problem: The value of $x$ in $\ce{Fe(NH4)2(SO4)2 ⋅ xH2O}$ can be found by determining the amount, in moles, of sulfate ...
2
votes
1answer
86 views

How to set up an equation to solve a rate law computationally?

I am confused on how to set up my equations to use in the solver. I have an equation $$\ce{A + 2B -> C}$$ As a given, it is first order in A and second order in B. What I need to do is to solve for ...
2
votes
1answer
50 views

are there any stable four membered chelate rings?

With reference to coordination compounds, most chelate rings formed with the metal atom and ligands are 5-member rings (including the central metal atom), such as complexes with Oxalate, ...

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