# All Questions

28,833 questions
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### Using significant figures to imply the stated error

The question reads; Express each of the following quantities, using significant figures to imply the stated error. (a) 3.6965 p/m 0.02 (b) 25600 p/m 10 (c) 56200 p/m 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 have the same number of electrons (two, in the $\mathrm{1p}$ orbital), and $\ce{Be}$ has ...
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### Behavior of molecules at absolute zero

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

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 ...
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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

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 ...
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### 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, ...
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### 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

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 ...
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### 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

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 ...
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### Can lone pair be converted into pi-bond

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

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 ...
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### 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 ...
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### 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

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?

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 ...
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### 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 [on hold]

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?
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### Which reactions occur during the oxidation and dissolution of bromide/bromine?

I'm trying to understand the fate of bromide anions during and after they undergo anodic oxidation. I have a solution of 94% DMF/6% water (by volume) with 0.1 M tetrabutylammonium bromide (TBAB) as ...
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### Valence bond theory and molecular orbital theory — how do they complement one another?

Based on my readings, valence bond theory (VBT) and molecular orbital theory (MOT) tend to complement one another in explaining a molecule, but I don’t understand how VBT helps us explain the ...
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### What takes place in this transformation of the 1,3-dicarbonyl?

I was just looking at a particular synthesis method on the Organic Chemistry Portal when I saw a particularly puzzling step, involving a 1,3-dicarbonyl compound. The step which I am puzzled by is ...
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### Mixing Liquid Butane and Oxygen [on hold]

Hello Chemistry community. It's struck me a bit thinking about mixing butane and oxygen up in one canister, both being liquid and letting them vaporize and burn as a mix. That will definitely make for ...
Krapcho's decarboxylation is a reaction involving esters with a electron-withdrawing group $\beta$ to the carbonyl group and halide ions. It is typically conducted with $\ce {LiCl}$ and $\ce {DMSO}$ ...