All Questions

-1
votes
0answers
10 views

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
2
votes
0answers
13 views

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-...
0
votes
0answers
19 views

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?
3
votes
1answer
120 views

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 ...
1
vote
0answers
27 views

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 ...
0
votes
0answers
9 views

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 ...
1
vote
1answer
34 views

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 ...
0
votes
0answers
25 views

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 ...
0
votes
0answers
21 views

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 ...
-4
votes
0answers
15 views

Rank the substances below from highest boiling point to lowest boiling point [on hold]

Need help all structure are similar so i am confused
-3
votes
0answers
19 views

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!
2
votes
1answer
23 views

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 ...
4
votes
2answers
252 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, ...
1
vote
1answer
25 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.
1
vote
0answers
29 views

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 ...
2
votes
1answer
65 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 ...
-1
votes
0answers
20 views

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 ...
-3
votes
0answers
25 views

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
-1
votes
2answers
66 views

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 ...
-1
votes
0answers
31 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 ...
-1
votes
0answers
30 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?
1
vote
2answers
127 views

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 ...
1
vote
0answers
18 views

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 ...
-1
votes
0answers
30 views

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 ...
0
votes
0answers
30 views

Adiabatic flame temperature of a blast furnace gas

Calculate the adiabatic flame temperature of combustion of a blast furnace gas analyzing $25\%$ $\ce{CO}$, $10\%$ $\ce{CO2}$, and rest nitrogen. Use theoretical amount of preheated air at $\pu{1000 °C}...
-2
votes
0answers
16 views

Chemical Equation [on hold]

I am doing a project on the synthesis of detergent by using waste cooking oil. I need help in the chemical equation for the synthesis process. Cooking oil + Sodium hydroxide + Sulphuric acid + Formic ...
1
vote
1answer
31 views

Calculate Gibbs energy of dinitrogen pentoxide using its vapor pressure and sublimation

I am having trouble with the following problem: Dinitrogen pentoxide, $\ce{N2O5}$, is a solid with a high vapor pressure. Its vapor pressure at $\pu{7.5 °C}$ is $\pu{100 mmHg}$, and the solid ...
-5
votes
0answers
34 views

how much money is 1 gram of Hyaluronic Acid? [on hold]

I just wanted to ask how much money 1 gram of Hyaluronic Acid is/could be. I am currently doing a research paper.
-1
votes
1answer
34 views

How to I measure the acidity of milk?

I am doing a High school lab experiment and I was wondering how would I go about looking at the acidity of milk. I think that it would involve titration of some kind but I am not sure how to do it.
-3
votes
0answers
15 views

Concentrations on Facial cream [on hold]

Does the concentration of each ingredient in the facial cream affects the effectiveness of the facial cream? why and how?
-1
votes
0answers
15 views
0
votes
0answers
28 views

How do chelating ligands interact with metal orbitals?

How do ligands like acac and ox interact with metal d orbitals? I know both are pi donor ligands (weak field), so do they interact with the T2g set of orbitals?
0
votes
2answers
38 views

Reaction mechanism for the conversion of acyl hydrazide to acyl azide

How is an an acyl hydrazide converted into an acyl azide in the presence of $\ce{HNO2}$? According to me, the $\ce{-NH2}$ group of hydrazide will get converted into $\ce{-N2+}$ through $\ce{HNO2}$. ...
0
votes
1answer
33 views

Why this redox equation occurs on basic medium?

I have the following redox equation that I need to balance: $$\ce{MnO4-(aq) + SO3^2-(aq) → MnO2(s) + SO4^2-(aq)}$$ The problem says that it happens on basic medium, but I don't see the $\ce{OH-}$ ...
-2
votes
0answers
13 views

Analysis of a mineral sample containing pyrite [on hold]

A mineral of a process contains $90\%$ $\ce{FeS2}$ and $10\%$ inerts by weight. This material is calcined with $25\%$ excess air according to the reaction: $$\ce{FeS2 + O2 → Fe2O3 + SO2}$$ ...
-4
votes
0answers
15 views

I need to make 400ml 5% w/w solution of sulphuric acid. How much acid do I need to dilute with water to get the total of a 400ml 5% w/w solution [on hold]

I need to make 400ml 5% w/w solution of sulphuric acid. How much acid do I need to dilute with water to get a 5% w/w solution totaling 400ml?
-3
votes
0answers
23 views

Which would be more effective as antifreeze in an automobile? [on hold]

A solution containing: a.) 10 kg of methyl alcohol or 10 kg of ethyl alcohol b.) 10 m solution of methyl alcohol or 10 m solution of ethyl alcohol
-4
votes
0answers
13 views

Identify any polar bonds? [on hold]

ether and the way they overlap with the orbital on the two c atoms
0
votes
0answers
30 views

Electrochemistry: What are the ideal parameters for a power supply? [on hold]

I'm very new to chemistry and I'm experimenting with electrochemistry as I already have a background in engineering. I'm designing a power supply specific to that purpose. I've synthesized acid from ...
1
vote
0answers
23 views

Why do aromatic compounds have an upfield shift upon coordination to metals?

Why do aromatic compounds have an upfield shift upon coordination to metals e.g. ferrocene? The 1H NMR shows a single environment at ~4.1 ppm. This is in contrast to the usual aromatic shift of ...
0
votes
1answer
33 views

Uncertainity in the calculation of the amount of substance

I am using $n = cV$, to find the amount of substance. Concentration of the standard solution is $\pu{1 mol/dm3}$ (no uncertainties given). However, uncertainty in the measurement of volume is $\pu{± 0....
-2
votes
0answers
28 views

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 ...
-1
votes
1answer
66 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/...
-2
votes
0answers
16 views

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?
1
vote
1answer
18 views

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 ...
6
votes
1answer
174 views

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 ...
2
votes
0answers
25 views

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 ...
-1
votes
0answers
36 views

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 ...
1
vote
2answers
24 views

What happens during Glycolysis? [on hold]

Can I get brief explanation of the reactions that occur under Glycolysis? What do the curved lines represent?
0
votes
1answer
20 views

Reagents in Krapcho's decarboxylation

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 $\ce {DMSO}$ ...

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