All Questions

2
votes
3answers
48 views

Solubility of solids in liquids

How does crystallisation happen and why? I have been told that when a solid is dissolved in a liquid solvent, an equilibrium is set up between processes of dissolution and crystallisation. But if ...
3
votes
3answers
56 views

Why sp3 hybridisation in NH3 but bonding with pure p orbitals in case of other hydrides of group 15 [duplicate]

According to my book, the following line was given relating to the bond angle in Group 15 elements The bond angle in PH3, AsH3 and SbH3 is close to 92° which suggests that the orbitals used for ...
0
votes
1answer
38 views

Electrochemistry: Synthesis of acids from conjugate base. What is the blue acid? [on hold]

I'm currently experimenting with electrochemistry. My current experiment is pulling the anion off of the conjugate base of various acids to evolve the acid in the oxidation cell. I'm using laptop ...
-3
votes
0answers
17 views

Thermochemitsry [closed]

Equal masses of two substances A and B absorb 25 joules of energy if the temperature of A increases by 4 degrees and the temperature of B increases by 8 degrees what will happen to the specific heat ...
3
votes
1answer
202 views

Why BiCl5 isn't stable?

I read this in a textbook: $\ce{Bi(V)}$ is very unstable and is a good oxidizing agent. Why does it happen that way? Is it because in $\pu{+5}$ oxidation state $\ce{Bi}$ pulls in more electrons ...
-2
votes
2answers
45 views

How to convert but-2-ene to but-1-ene? [closed]

How can we convert but-2-ene to but-1-ene? Is it even possible, since but-2-ene is the more stable one.
0
votes
1answer
21 views

What is the molecular formula of 2-ethynyloctahydro-1H-indene?

I thought the formula for this $\ce{C11H15}$, but it's not. I need assistance in finding the proper formula:
4
votes
1answer
51 views

Chemical shifts of OH protons

The chemical shift of a proton is an indication of the amount of shielding it receives from the electron density on it or other magnetic anisotropy effects present in the molecule. For the protons of ...
-1
votes
1answer
42 views

How do I solve this problem? [closed]

So I take an online school. I made the mistake of dropping this class temporarily to work on another class. I’m back to chemistry and I do not remember anything I did! If I could have help solving ...
5
votes
0answers
58 views

How to evaluate the expectation value of the Hamiltonian for a three electron Slater determinant?

I'm having trouble with a few concepts dealing with slater determinants and many electron systems. In particular, when dealing with 3 electron systems, I know that $$ \psi_0 = \frac{1}{\sqrt{6}} \det ...
1
vote
1answer
60 views

Applications of magnesium sulfate monohydrate MgSO4 · H2O

How is magnesium sulfate monohydrate $\ce{MgSO4 * H2O}$ used for in chemistry and how does it work as a valuable laboratory drying agent? I could not find too much information in my book or the ...
0
votes
0answers
20 views

Addition of HBr on a cyclic system

Which product will be be major ? And does the resonance makes the compound more stabilised than a 3° carbocation as formed in the 1st case ?
0
votes
0answers
18 views

Cross Cannizzarro reaction for ketones

I want to ask that cross cannizzarro could be possible between any aldehyde + ketone mixture(without alpha H) and we get products as aldehyde get oxidised and ketone get reduced(along with self ...
0
votes
3answers
56 views

Conversion from a PPB value to µg/m3 of Isobutylene

I have a quite simple problem, found a lot of information about it, but I am not sure anymore if I do my calculations right. I own a sensor, which reports measurements in isobutylene units as PPB. So ...
-1
votes
1answer
22 views

Molar ratio that involves solid and liquids [closed]

I have a molar ratio for a solution that consists of 1 TEOS: 8 Ethanol: 0.8 HCL: 10^-4 Chlorophenol Red (3',3" dichlorophenolsulfonepthalein). TEOS, Ethanol, and HCL are all liquids that I was able to ...
-3
votes
0answers
17 views

Rock Cleaning and Identifying [closed]

Looking for best practices in cleaning & identify rocks and minerals of all kinds found in the Great Lakes Region. I have agates, fossils, conglomerates and unknowns!
-2
votes
0answers
16 views

Why is the hydrogen on the adjacent carbon attacked in elimination? [closed]

Why does the OH- ion attack the hydrogens on the carbon adjacent to the one bonded to the halogen, during elimination.
-1
votes
0answers
21 views

Reaction Of Alkyl Halide with Aqueous Ammonia [closed]

What will be the products of SN reaction of alkyl halide with Aqueous Ammonia. In this reaction which will be attacking nucleophile on alkyl halide, Hydroxide ion or Ammonia?
-3
votes
0answers
18 views
1
vote
1answer
40 views

Quasi-static implies that T aprox equals Tsurr?

A few days ago I re-visited my undergraduate thermodynamics notes and (as you may have seen from the amount of questions I have been posting) I have encountered many difficulties that I overlooked at ...
-1
votes
0answers
27 views

What is an effective and efficient method of dealing with the fission products of a nuclear reactor? [closed]

The main fission products produced by nuclear fission are 131I, 137Cs, 92Kr, 141Ba and 90Sr. The problem with these fission products is that they are just lied to waste in an underground storage ...
-1
votes
0answers
45 views

Why is the boiling point of SbH3 higher than the boiling point of NH3? [duplicate]

Why is the boiling point (b.p.) of $\ce{SbH3}$ higher than the b.p. of $\ce{NH3}$ even though the melting point (m.p.) of $\ce{NH3}$ is higher? Hydrogen bonding occurs in $\ce{NH3}$, so shouldn't the ...
1
vote
1answer
58 views

Oxalate Anion MO Diagram

I figured I’d study $\ce{C2O4^2-}$ as an organometallic ligand, and found that it is weak field (pi donor). I hence decided to construct a MO diagram. The oxalate anion is of D2h symmetry, so one ...
-1
votes
0answers
35 views

Which of the following substances will increase the acidity of phenol? [closed]

Which of the following substance will increase acidity of phenol? (a) Dil. $\ce{H2SO4}$ (b) Dil. $\ce{HCl}$ (c) Conc.$\ce{H2SO4}$ (d) Conc.$\ce{CH3COOH}$ Answer given is option (C)...
-5
votes
0answers
19 views

What are the weakest acid and weakest base in the world? [closed]

What are the weakest acid and weakest base in the world?jhsjkagrkhagsajk daksjdhgkagdkah iwetwyertgywiuegi
-1
votes
0answers
32 views

Cigarette smoke on clothes goes away on it's own [on hold]

Why is it that cigarette smoke on clothes goes away on its own overnight? I usually leave out not cloths after I go out and in the morning I can't smell it at all. Is this due to a concentration ...
0
votes
0answers
31 views

Do you think there would be anyone at the nearby research university who would let me use one of their mass spectrometers? [closed]

I'm legitimately serious. I have a few samples to run but I'm not associated with any larger organization and haven't been for a while. I just, well, need to do some mass spectrometry tests but don't ...
0
votes
2answers
62 views

How can I precipitate nitrate in the water? [closed]

I have aquariums and there is nitrate in the water, that's why we have to change the water. Would it be possible to precipitate the nitrate out?
0
votes
1answer
26 views

How to measure UV index? [on hold]

I am a high school student so please apologise if I say something very dumb or irrelevant. I am conducting an experiment in which I want to find UV index at different points. Such as under shade, ...
-2
votes
2answers
47 views

final concentration

Cheers. I am doing a hands on lab for intro to Chemistry. I basically have to do something seemingly simple. I pour 8.0 grams sugar, weighed, into a volumetric flask that is volume of 25mL. I add 15mL ...
2
votes
0answers
46 views

Hydrogen Bonding in Water (MO theory)

Valence Bond Theory tells us that each of the “sp3” (in reality, 44% s character) oxygen line pairs in water can act as electron donors, but observing the MO diagram for water tells us that the 2 non-...
-3
votes
0answers
26 views

About the stability of carbocation [closed]

I need to ask that which carbocation is more stable and why? Thankyou.enter image description here
2
votes
1answer
42 views

Radial pair distribution function (VMD). How to define it for a water NaCl system with multiple Na and Cl?

I'm struggling to understand a paper in which someone has presented radial distribution functions (RDFs) for a system that contains multiple Na, Cl, and water atoms/molecules. I don't know exactly ...
-1
votes
0answers
27 views

Features of sodium azide decomposition [closed]

Does the gas generated from a combustion or thermal decomposition like sodium azide has the same temperature as the temperature of the reaction itself? And what stable temperature is the gas from a ...
-1
votes
0answers
20 views

How do ammonium metavanadate and oxine are used to identify alcohols? What is the reaction? [closed]

ammonium metavanadate and oxine are used to identify alcohols. What is the reaction?
-3
votes
0answers
27 views

College: Chromatography Analysis of toothpaste. Can someone please review my write up [closed]

[College:Chromatography] Hi there, Im absolutely struggling to know if I done this right or should present everything in a better format! here is the Laboratory manual pg1 pg 2 with the Standard ...
-3
votes
1answer
27 views

thermodynamics of solid-liquid of acetic acid and glycerol [closed]

Can glycerol (and acetic acid) change from solid to liquid when compressed at room temperature (20 degrees celsius)?
0
votes
0answers
23 views

Does water alkalinity affect the solubility of sugar in water? [closed]

Does the water alkalinity or hardness affect the rate at which sugar dissolves? I haven't had my water filters serviced in a few years and I've noticed that after stirring iced tea mix into a cup that ...
-2
votes
0answers
21 views

Chemicals that compose tie-dye [closed]

What are the main chemicals present in tie-dye? Our class is attempting to do some trials with a dilute solution of tie-dye and measure its molar absorptivity, but we need to find the composition of ...
-3
votes
0answers
22 views
0
votes
0answers
51 views

Is there any substance composed of 1C, 6H, 2O? [closed]

Is there any substance with the following composition: 1x Carbon 6x Hydrogen 2x Oxygen Or a multiple of these elements in proportion, for example 2C, 12H, 4O? If such a substance does not exist, ...
0
votes
0answers
35 views

How does one plot molecular orbitals (probability electron density plot) for complex nonlinear molecules?

For molecules such as $\ce{H2}$, we can put the molecule along one of the Cartesian axes, with probability density along the other orthonormal axis and plot it. We can do the same for planar molecules ...
-1
votes
0answers
17 views

Stablility of ground state Bohr Orbit [duplicate]

Bohr's theory of the hydrogen atom predicts that the energy of the electron in the $n$th energy level is given by $$E_n = -R_H \left(\frac 1{n^2} \right),$$ where $R_H = 2.18 \times 10^{-18} \ J$. ...
0
votes
2answers
44 views

Is there a way to search for adducts by exact mass? [on hold]

We found an unknown of exact mass 217.082. Is there a tool that one can search by an exact mass get a list of possible compounds. We have considered desmethylnaproxen as a possibility, but found its ...
0
votes
0answers
29 views

Nomenclature of nitrogen containing organic compounds and ammonia derivatives [closed]

I got stuck when names like imines, oximes, etc. come across. Please give me a list of nomenclature of important nitrogen containing compounds. It can't be found on google on one place, and I don't ...
-2
votes
0answers
16 views

What are the things that are used by different kinds of fire extinguisher to keep oxygen away from the fire [closed]

Please tell me about the things that are used by different kinds of fire extinguishers to keep oxygen away from the fire
-1
votes
1answer
26 views

Real gas equation at high molar volume

How would the van der Waals equation of state look like when molar volume of gas is high? Does high molar volume correspond to low pressure? My textbook says that A real gas behaves similar to an ...
-1
votes
0answers
18 views

Why does NO prefer oxidation at lower temperature to give NO2 [closed]

Oxidation of compound at higher temperature is favorable condition but NO prefer oxidation at lower temperature to give NO2
-1
votes
1answer
28 views

Which solution has higher boiling point?

Between a 2%(w/v) aqueous solution of NaCl and RbCl, which will have a higher boiling point. Here there are two competing factors. First there's the fact that NaCl has a higher concentration. So it's ...
-1
votes
2answers
53 views

Questions on Neutral oxides

Neutral oxides, are non metal oxides which are neither acidic nor basic. I have noticed a pattern for neutral oxides which I am unsure actually holds true. $\ce{CO}$, $\ce{H2O}$, $\ce{NO}$ and $\ce{...

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