# All Questions

28,405 questions
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### Dehydration of 4-Hydroxyphenylacetone to Phenylacetone possible?

Is a Dehydration of 4-Hydroxyphenylacetone (CAS.770-39-8)to Phenylacetone with H2SO4 possible? Does anybody have some Literature on that, cause i searched and didnt find anything.
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### Temperature dependency on isotope fractionation

I have a question concerning isotopic fractionation. I am trying to explore the effect of temperature on isotopic fractionation. I know that isotopic fractionation is temperature dependent and it ...
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### Solubility and analysis of diclofenac and lidocaine base

Helllo guys; I want to make a gel of diclofenac sodium and lidocaine base and prepare for quantitative analysis by uv spectroscopy.but there is close overlap for both(diclofenac sodium and lidocaine ...
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### Software or methods to predict properties of a substance

There's a very similar question here Software for predicting chemical reactions My question is slightly different. Given a formula for a molecule or a substance consisting of several molecules, is it ...
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### What is a simple formula to approximate the change in relative humidity as temperature rises/falls?

The moisture-carrying ability of air goes up as the temperature rises. So if I take a volume of air and heat it or cool it (allowing it to expand/contract so the pressure remains constant) how can I ...
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### If water vapour is assumed to be a perfect gas… Calculate the internal energy change when 1 mole of water is converted to ice

If water vapour is assumed to be a perfect gas, molar enthalpy change for vapourisation of 1 mole of water at 1 bar and 100 C is 41 KJ/mole. Calculate the internal energy change when 1 mole of water ...
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### HCl + NaCIO + Al + Fe What Happens? [on hold]

So I am going to combine the following elements and chemicals for an experiment. HCl + NaCIO + Al + Fe (Hydrochloric Acid + Sodium Hypochlorite + Aluminum + Iron) I understand that hydrochloric ...
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### Are these the intermediate steps for dihydroxylation of an alkene using OsO4?

or perhaps Also, is NaHSO3 required at any point and if so why?
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### Cathode lenght and configuration

I have cast iron cultipacker wheels that are rusted. I plan on using 1/2 rebar for anodes. 2 questions. 1 Will it make a difference if i use straight bars along edge of container or bend 90° and ...
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### Can iodometry analyse the peroxide radicals of palmitic acid after it has been heated?

I know that oleic acid in palm oil forms hydroxide radicals to form aldehydes in their secondary oxidation. Does a palmitic acid go under a similar process?
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### The carbon-13 NMR for 1,1,1-trichloroethane

I was working the following spectroscopy problem from Clayden 2e that asks us to identify the structure of a compound from information about its carbon-13 NMR peaks. Problem 3.5: The solvent ...
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### Why are dislocations thermodynamically unstable?

Dislocations are thermodynamically unstable in contrary to point defects.In this context I would like an answer for this.
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### Some clarifications about Point Groups rapresentations for molecules

This is what I've understood until now about this subject, please confirm if what I write is true or not. Choosen one molecule, there is a certain number of symmetry operations which this molecule ...
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### Difference between given mass of uranium block used in calculation and mass of protons calculated to be within it

I am explaining $E=mc^2$ in a project and calculating as an example the energy released if all the protons in a $\pu{1kg}$ block of uranium were converted into energy. To do this I have used mass/mol/...
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### How does ionic compounds exchange electrons in crystal lattice?

What I couldn't understand is, for example in NaCl, there is one Na and one Cl is needed. Because Cl needs one electron to complete it's octad. But in crystal structure, there are six Cl bonded one Na,...
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### Difference in leaving group ability due to variation in nucleophiles

Wikipedia writes: There can still exist contextual differences in leaving group ability in the purest form, that is when the actual group that leaves is not affected by the reaction conditions (by ...
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### In zero order why we don't need the coefficient of reactant in integration of rate law?

For a reaction: $\ce{aA->product}$ The rate law is $\text{Rate}=-\dfrac{\mathrm d[A]}{a\,\mathrm dt} = k$ Where: $k$ is the rate constant $[\ce{A}]$ is the concentration of the reactant $\ce{A}$...
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### Role of copper oxide in this ArSN2 reaction [on hold]

Please clear this doubt of mine?
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### What is the origin of chirality in the universe?

I am just curious with the fact that our body is made of so many chiral molecules the DNA that we possess is chiral, the amino acids in our body is chiral and there are many other objects other than ...
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### Production of alkyl halides

One of the famous reactions of production of alkyl halides is the reaction of hydrogen halide with alcohols. The synthesis of the alkyl halide is different depending upon the halogens. I was taught ...
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### Electron configuration project [on hold]

My teacher wants me to make a “ 3D accurately labeled and modeled s,p,d and f orbitals for electrons” any help pictures maybe? Due Monday!!
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### Proof of the VSEPR shapes

The VSEPR predicts that the atoms arrange themselves in such a way that the electron pair repulsion is minimized. Thus the atoms arrange themselves in space in such a manner so as to be as far apart ...
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### What is the mechanism for the formation of azodye when LiAlH4 reacts with nitrobenzene [on hold]

I couldn't find the mechanism. I thought aniline would be the final product.
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### How is the force constant and the distance of equilibrium calculated in the CHARMM force field (constants kb and b0 respectively)?

I am trying to create a molecular dynamics simulation by implementing a simple version of the CHARMM potential function: How are the kb and b0 constants derived based on the length of the bond?
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### Anyone know how to solve this problem? [on hold]

Guys this question is from my homework. Any thought on this?
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### Oxygen Solubility in Water

This is probably really obvious, but I really don't understand. Why does oxygen dissolve in water when oxygen is a nonpolar molecule and water is a polar molecule? It's obvious that oxygen does ...
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### What tends to gain electrons? Why? [on hold]

What atoms tends to gain electrons? Metals, nonmetals or metalliods? I tried to look this up. I need to know for class- we have a test soon. Gaining electrons is one of the key points.
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### Best level of theory for many CO2 molecule behavior [on hold]

What level of theory is best to use for simulating effects of varying levels of light and magnetic force on a set of closely aligned CO2 molecules (preferably 5 or more). Is there a Windows desktop ...
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### Substance dissolved in non-polar solvent, then added to polar solvent? [on hold]

What is the fate of a substance dissolved in a non-polar solvent, say ethanol or acetone, then added in small proportion, say 10% v/v, to a polar solvent such as water? The solubility of the substance ...
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### From where does nucleophile attack the ketone in a nucleophilic addition reaction ? [on hold]

I inserted a picture to help show where my misunderstanding lies. I know that in the nucleophilic addition of ketones and aldehydes , a racemix mixture is produced . And I know that the reason is ...
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### Reaction between hcfc 141b and isopropyl alcohol [duplicate]

Can 50% 1,1-dichloro-1-fluoroethane react with 50% isopropyl alcohol? Condition: room temperature
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### How to find the pH for a very diluted HCl solution? [duplicate]

Yesterday my chemistry professor asked us to try to solve this problem. Find the pH of this reaction: $$\ce{HCl + H2O -> H3O^+ + Cl^-}$$ Knowing that: The volume of the solution is 1 liter. ...
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### Could Be2- exist?

I understand that Be2 cannot exist, since it has as many electrons in the antibonding as in the bonding orbitals. But it seems to me that since the next electron would go into the πu orbital, which ...
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### Diffuse functions for Ahlrichs/Karlsruhe basis sets in Gaussian?

As the question states, can one use the basis sets of Ahlrichs and coworkers (e.g. def2-SVP, def2-TZVP, ...) with diffuse functions (e.g. def2-TZVPD) in Gaussian? The regular basis sets have been ...
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### Electrolysis of water and using Sulfuric acid as a conductor [on hold]

Okay, when I use Sulfuric acid as a conductor, then, no change occurs in the sulfuric acid. But why? Why doesn't something occur with the sulfate ions? If there's any problem in my question please ...
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### Why is Aromaticity good for molecules stability and Anti-aromaticity isn't? [on hold]

I have read that ring current in aromatic molecules is stabilizing and that in anti-aromatic is destabilising. But I cannot wrap my head around it why.
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### Which has the smallest bond angle? [on hold]

Which of the following has the smallest bond angle? A)(I3)- , B)CS2 , C)(N3)- , D)XeF2 , E)NO2.
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### Hydrogen bonding deshielding

In NMR spectra it has been stablished the deshielding effect on those hydrogens participating in a hydrogen bond but my question is: if the $\ce{O}$ of a $\ce{-CH2OH}$ group acts as a donor, does it ...
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### Question on enthalpy change [on hold]

Well, this is a picture from my book, My problem here is that, in exothermic reactions, isn't the enthalpy of reactants greater than the enthalpy of products? Then, why does my book say otherwise? ...
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### The real structure of difluoro(dioxo)xenon (XeO2F2)

I have a problem regarding structure of difluoro(dioxo)xenon ($\ce{XeO2F2}$). I have posted a image above. my teacher is saying that the structure B is correct as there is very less repulsion in ...
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### Why we don't we save water by boiling the contaminated water to get the pure steam?

I see lot of drinkable water wasted in household and industrial activities, water usually gets contaminated with detergents(and other household materials),chemical effluents released from factories . ...
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### Why must a buffer solution contain both a weak acid and a salt solution of its conjugate base?

Doesn’t the weak acid dissociate to produce the conjugate base on its own? I understand that when a strong base is added to the buffer solution, the hydroxide ions will react with the hydrogen ions ...
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### How to determine concentration of components in sample using Gas Chromatography and spiking technique? [on hold]

A pesticide sample of 1,250 g contains the main components A, B, C and the filler material is dissolved in a solvent up to 1L. As many as 5 mL of the sample injected into the GC turned out to give a ...
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### Calculate the transition dipole moments between the 1s inner shell and the high-lying states of a molecule

I am trying to calculate the transition dipole moments between the 1s inner shell and the high-lying states of N2, namely, $<\psi_{1s}|{\bf r}|\psi_{high-lying}>$. For this, I installed ...
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### Why is a thioester more reactive than an ester? [duplicate]

I'm curious as to why a thioester is more reactive than an ester when it comes to reactivity towards nucleophilic attack. I know that the two factors affecting the reactivity towards nucleophilic ...