All Questions

28,891 questions
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the percentage of C and H [on hold]

on complete combustion of 0.25 gram of an organic compound 0.22 gram of CO2 and 0.18 gram of H2O are obtained. the percentage of C and H respectively in the organic compound are
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Electronic configuration of d5-d-10 in terms of t2g and eg in an octahedral field when delta O is smaller than pairing energy?

As per the Crystal Field Theory, d4 splits into t2g3 and eg1 when delta 0 < Pairing energy. What about d5, d6 and so in the same case? Does the fifth, sixth... electrons enter the t2g or eg ...
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Under sn1 conditions which will be more reactive secondary butyl chloride or isobutyl chloride?

I have doubt that isobutyl chloride forming a primary carbocation will rearrange very fast to a tertiary carbocation which will be more stable than carbocation formed by secondary butyl chloride. So ...
247 views

Structure of pyrophosphorous acid

What is the structure of pyrophosphorous acid? I asked this question here because the answer which I found on web and other resources are inconsistent which each other. For example, following data is ...
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Using significant figures to imply the stated error [on hold]

The question reads; Express each of the following quantities, using significant figures to imply the stated error. (a) $3.6965 \pm 0.02$ (b) $25600 \pm 10$ (c) $56200 \pm 100$
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Precipitation of AgCl from the tap water solution of the group 2 chloride

I had this question about an experiment where the group 2 chloride was dissolved in distilled water and excess $\ce{AgNO3}$ was added to the solution to form $\ce{AgCl}$ precipitate. One of the sub-...
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Why V³⁺/V²⁺ couple has low reduction potential?

$\ce{V^2+}$ ion is more stable than $\ce{V^3+}$ because of the half-filled $\mathrm{t_{2g}}$ level. So, shouldn't the reduction potential be high?
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Why does the beryllium 2+ ion have a larger radius than a helium atom?

$\ce{Be^2+}$ has an ionic radius of $\pu{45 pm}$, while $\ce{He}$ has a radius of only $\pu{31 pm}$. If they are isoelectronic (they both have two elections in the $\mathrm{1p}$ orbital), and $\ce{Be}$...
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Behavior of molecules at absolute zero [on hold]

Can we say that at absolute zero temperature a gas like $\ce{CO2}$ will be separated into the constituent atoms and after that all of them will solidify devoid of any potential or kinetic energy as ...
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Co-ordination bond, Valence Bond Theory [on hold]

For Co(iii) ions when a weak ligand approaches (F), there is formation of sp³d² hybrid orbitals where only 2 d orbitals are going hybridisation, why can't all the 5 d orbitals participate in ...
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Estimating the absolute entropy of water at room temperature

I thought it would be fun to get an idea of how enormously large $W$ in $S = k\ln W$ is. I'd specifically like to estimate this for a mole of water at $\pu{1 atm}$ and $\pu{298 K}$. To do this, I ...
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Conflicting definitions of Lewis acids

I have struggled in attaining a solid grasp of the Lewis acid/base concept largely because so many sources seem to offer conflicting definitions. For instance, Klein's Organic Chemistry mentions that ...
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Heating Dry Benzenediazonium Chloride

If we heat BDC with water then phenol is formed. I was wondering what would happen if we heated dry benzenediazonium chloride. I know that on heating benzenediazonium fluoroborate we obtain ...
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Rank the substances below from highest boiling point to lowest boiling point [on hold]

Need help all structure are similar so i am confused
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Types of reactions [on hold]

What type of reactions can CH3-CH2-O-CH=O, CH3CH2NH+ OH, and each radical product from CH3CH2NH + OH undergo? I am lost on how to answer this question, I guess any help on it would be great!
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Why would decreasing ionic strength of buffer disrupt hydrogen bonds

I'm reading about cDNA synthesis in my textbook and it mentions that: The captured mRNAs are subsequently released and collected, for example, by decreasing the ionic strength of the buffer so that ...
287 views

Why doesn't the particle in a ring model have a potential energy term?

I was thinking of the "particle on a ring" problem as a subdivision of a bigger problem, i.e. the hydrogen atom. While in the hydrogen atom problem, the Hamiltonian contains a potential energy term, ...
30 views

Gabriel Phthalamide Reaction

Can we use acid chloride in place of alkyl chloride in Gabriel Phthalamide Reaction? Maybe it can be used as process to synthesize amides.
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Amber paramfit “monomer (or ligand)” problem [on hold]

I am trying to parameterize a novel molecule which has atoms not included gaff or parm force field. I finished parameterizing vdw-bond and angle force field. Also I did PES Scan for dihedrals and I ...
75 views

Finding the color of crystal violet theoretically

I am trying to find the color of an organic molecule, crystal violet, theoretically. I suspect that the color is due to the large conjugated system. My question is, how would I go about finding the ...
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High quality neutron mass measurement by spectroscopic isotope mass measurement [on hold]

The purpose of my question is to know if it is possible to measure with a standard deviation of less than $\pu{1e-4}$ the average mass of the neutrons present in any isotope of a heavy element. For ...
31 views

Can lone pair be converted into pi-bond [on hold]

I am confused in resonating structure. My doubt is that in aromatic rings we can't make lone pair act as $\pi$ bond but in $\ce{(CO3)^{2-}}$ lone pair act in resonance as $\pi$ bond
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Molar mass vs molecular mass [duplicate]

Why is that molar mass has of a substance, which is the mass of one mole of a substance ($6.02\times 10^{23}$ particles of that substance) has the same value as molecular mass, which is the mass of ...
36 views

What kind of prospects are there in computational chemistry? How can it transform lives? [on hold]

What kind of prospects are there in computational chemistry? How can it transform lives? As it's an "abstract" branch of real-world chemistry, then understanding how it ties to real-world chemistry ...
37 views

What will be the product here?

In this question, I thought the answer would be 3rd due to methyl shift but as per the solution, it is 2nd. Is it a case of Ethyl shift?
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Entropy change of isothermal irreversible expansion of ideal gas [duplicate]

Two mole of an ideal gas is subjected to isothermal expansion from $\pu{2 atm}$ to $\pu{1 atm}$ at $\pu{300 K}$. Calculate entropy change of the system, surrounding and total, if the process is ...
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Choosing the right wavelength for calibration curve and for analysis of actual results

Introduction: I am currently conducting a series of experiments in which I am studying the transport of polystyrene nanoparticles (PNPs) through sand and soil. This is done in sand/soil columns, into ...
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What would be the best way to study Quantum Chemistry? [on hold]

Title. I have a relatively sound mathematical foundation (linear algebra, differential equations, multi variable calculus etc.), so I’d like to ask what the “best” way to study Quantum Chemistry would ...
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Acidity order of p-halo benzoic acids? [on hold]

Its known that para-chlorobenzoic acid is more acidic than para-fluorobenzoic acid. But can anyone provide me the whole acidity order of para-halobenzoic acids with pKa values ? Here is what my book ...
82 views

Why Guanidine is called as strong base

I've studied pka of H2O as 15 and anything with a pka lower than it should be a acid . Guanidine has a pka of 13.8 and is being called as strong base . Why is it so. https://en.m.wikipedia.org/wiki/...
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Iron(III)oxide equation [closed]

If iron ore containing 100t iron(III)oxide,how many tons of pig iron containing 6% impurities can be extracted from reduction of the iron ore by carbon monoxide?