Skip to main content

Questions tagged [stability]

Applied to a chemical species, the term expresses a thermodynamic property in reference to a standard, stating that one state is lower in energy than another. The tag should be applied to questions seeking answers with respect to the stability (or instability) of a certain chemical species, molecular entity and/or electronic structure. It must not be applied to questions about the reactivity of particular chemical species.

Filter by
Sorted by
Tagged with
0 votes
0 answers
23 views

Stability order of xylenes [duplicate]

M-xylene is the most thermodynamically stable amongst the three isomers due to hyperconjugation. Can we comment on the stability order of the other two forms as well? If yes, what would be the order ...
Sarah's user avatar
  • 11
5 votes
1 answer
252 views

Identify the more acidic hydrogen in 1-(methylsulfanyl)propane-2-thione

This was a question that was asked in one of my exams, in which we had to confirm if the given order was correct or incorrect. The key says the given order is correct and the professor at my high ...
Meme's user avatar
  • 61
-4 votes
2 answers
73 views

I was told that Lithium and group 2 bicarbonates does not decompose on heating.Group 1 bicarbonates does decompose except lithium

But in some sources it was explained that stability of group 1 bicarbonates increases down the group.If it is true then how does lithium bicarbonate does not decompose ?.Can anyone please tell me ...
B. RITHISH's user avatar
0 votes
0 answers
53 views

what role does mesomeric effect and inductive effect play in stability of carbocations in presence of halogens

what should be the ideal explanation behind the order of stability of these three compounds? Case-1 In these three examples the first two structures have a positive mesomeric effect and it is greater ...
Lakshya Dubey's user avatar
6 votes
0 answers
158 views

How predictable are the decomposition temperatures of trithiocarbonates?

How do the following parameters: Ionic radius of a cation. Oxidation number of a cation. Noble metal cation vs alkali metal cation. Something else that I may not know about. affect the decomposition ...
Paul Kolk's user avatar
  • 526
-3 votes
0 answers
22 views

Energetic stability and rate of reaction of organic compounds

I am currently taking organic chem for biologists (meaning the level, or the depth, we go into is easier than what a chemist would learn). What is the relation between Energetic stability and the rate ...
PepegaAskingQuestions's user avatar
-4 votes
1 answer
72 views

Stability of atomic/ionic quantum states in relation to the full octet rule

We have started our Chemistry Unit and the very first statement the teacher says is that "All Atoms want to be stable. They achieve this by having a full valence shell, which they achieve by ...
Dev P.'s user avatar
  • 1
7 votes
2 answers
187 views

Synthesizing Cyclotetrazane from Hydrazine and Diazene?

Could cyclotetrazane — a compound with nitrogen atoms arranged in a square configuration — be synthesized? A hydrogen atom would be bonded to each vertex (nitrogen atom): Could cyclotetrazane be made ...
Nitrogen-8's user avatar
-2 votes
2 answers
57 views

Stability of phenylic carbocations [closed]

Problem: Structure (1) is more stable than structure (2). My teacher stated that Structure (1) is more stable than Structure (2). I find this confusing. How can Structure (1) be more stable when ...
Haider's user avatar
  • 93
-2 votes
1 answer
55 views

Stability of atoms with 4 valence electrons [closed]

How do atoms with 4 valence electrons stabilize? Do they gain or lose 4 electrons? This might be a bit of a stupid question, but I'm not sure and I can't find anything online.
riesen mihar's user avatar
0 votes
0 answers
53 views

Behavior of polyanionic silicate chains in silico

I am trying to understand the stability of charged linear molecules, more specifically these, which contain periodically repeated high electron affinity parts, such as single-bonded oxygen (radicals). ...
Paul Kolk's user avatar
  • 526
-1 votes
1 answer
38 views

Stability of Nitro substituted phenylic anion

Which of the following is more stable: What I found on internet is 2nd structure ( meta position ) is more stable. But -NO2 shows -I (inductive effect) and -M ( metameric effect ) so ortho must be ...
Govind Prajapat's user avatar
0 votes
0 answers
27 views

Why is 1-ethylcyclohexene more stable than ethylidene cyclohexane?

Both compounds yield the same product, ethylcyclohexane, when hydrogenated. However, 1-ethylcyclohexene has lesser heat of hydrogenation than ethylidenecyclohexane, hence more stable. I want to know ...
Anu Vanguri's user avatar
-2 votes
1 answer
45 views

Why doesn't HBr show allylic substitution in presence of Peroxide?

HBr reacts with alkenes such as propene in the presence of Peroxide as per the Anti-Markovnikov rule. This is an addition reaction, forming 1-bromopropane as the major product. This happens due to the ...
Maddy's user avatar
  • 51
1 vote
0 answers
83 views

Stability comparison between Acetylene/Ethyne (C2H2) and Nitrogen Gas (N2) [closed]

N≡N is more stable than H2N—NH2 (hydrazine) But HC≡CH is less stable than H3C—CH3 Why is it so? Even though the size of the corresponding compounds and hybridization is the same? (Usually ethane is ...
Maddy's user avatar
  • 51
1 vote
1 answer
263 views

Can a carbocation ever be more stable than a neutral molecule?

The question is about finding the most stable molecule or species. Now my thought process was that cyclopropenylidene(1) was a carbene so would be unstable even though it is aromatic. Cyclopenta-1,3-...
mechanist's user avatar
  • 107
2 votes
1 answer
98 views

Is pentalene stable at room temperature?

Pentalene is planar, conjugated and has 8 π-electrons on its periphery, so it can be anti-aromatic. But if we polarize either of the π-bonds adjacent to the central C−C bond, the other ring will ...
shur's user avatar
  • 23
0 votes
0 answers
36 views

How to chemically remove niobium from boron carbide?

Previously I asked about chemical removal of CaO from boron carbide. I keep considering some refractory materials for use as sacrificial ones, so now I wonder if and how a layer of niobium (about 1.5 ...
akhmeteli's user avatar
  • 117
1 vote
0 answers
59 views

Rule for which heterocycles are stable?

In medicinal chemistry, is there a rule for which aromatic heterocycles are stable? I've heard that heterocycles with 3+ adjacent nitrogens for example are unstable. However looking in ChEMBL at the ...
Alex I's user avatar
  • 283
-2 votes
1 answer
55 views

How to chemically remove CaO from boron carbide?

Previously I asked (How to remove graphite substrate of boron carbide coating?) how to chemically remove a thick layer of graphite from a thin layer of boron carbide. It turned out that was a hard ...
akhmeteli's user avatar
  • 117
7 votes
0 answers
133 views

Metal hydrolysis and equilbrium constants from stability constants

Problem: I want to create minimum solubility plots for a series of metal hydrolysis species against pH (below). But I cannot reconcile literature stability constants and equilibrium constants. Context:...
NFA's user avatar
  • 123
0 votes
0 answers
30 views

Which is more stable, a secondary allylic carbanion or a primary allylic carbanion?

I came across this picture in a polymer chemistry course, specifically on anionic polymerization of conjugated dienes (butadiene). I dont understand why the secondary carbanion is more stable. Based ...
Dannis's user avatar
  • 1
1 vote
2 answers
182 views

Stability of H3MnO4, H2MnO4, HMnO4

I cannot seek out the reason why while $\ce{H3PO4}$ (phosphorus oxidation +5) is relatively stable and obtainable but $\ce{H3MnO4}$ (the same oxidation state +5) is rarely mentioned and perhaps ...
Shira's user avatar
  • 553
2 votes
0 answers
179 views

How ring expansion is possible here?

Recently I have came across this question. I went with the 3rd option as ring expansion cannot occur due to the formed stable 3 degree carbocation. But the answer key claims 4th option. How can ...
Kavin Ishwaran's user avatar
0 votes
1 answer
133 views

Non-octet structures of stable nitrogen compounds

A question in my exercise book demonstrates that nitrogen cannot form non-octet structures since the most common examples — nitrogen dioxide and nitrogen monoxide — are unstable/reactive. For example, ...
Freeby Freeby's user avatar
3 votes
1 answer
141 views

Are there LCMS compatible buffer systems available for the high pH range 12-14?

I want to perform chemical stability studies for different pH Values. To achieve pH Values from 1 to 6 I can prepare solutions with trifluoric acid and formic acid and ammonium formate and acetate. I ...
raptorlane's user avatar
5 votes
1 answer
254 views

Selective formation of enolates

I saw the following reaction on Modern methods of Organic Synthesis by Carruthers. The reaction is about the selective alkylation of trimethylsilyl enolates, and is shown below. However, I have some ...
Cyclopropanol's user avatar
-1 votes
1 answer
71 views

What is that substance coming from tractor tire?

I have old tractor with Bridgestone tires. When I press a clean white tissue against the tire, a black spot show on the tissue. Is that substance carbon black and it’s harmful to soil?
MasterMind's user avatar
2 votes
0 answers
72 views

Which methoxy- and nitro-substituted azulene has the lower ground state energy?

My contention is that the first azulene structure, with the nitro group on the aromatic cyclopentene ring has a lower ground state energy, as the negative charge can not only resonate into the nitro ...
big_yoshi's user avatar
-2 votes
1 answer
151 views

Is it possible to have multiple nitrogen atoms bonded to one carbon atom?

So I was wondering, if we replaced two of the hydrogens in methane with amine groups, would it be a stable compound? What about for R groups of varying size? Similarly, if I tried to make a compound ...
InactionBreedsMediocrity's user avatar
3 votes
2 answers
283 views

Why is silver(I) phosphate so unexpectedly thermally stable?

Silver(I) oxide is completely decomposed in air already at $\pu{300 °C}.$ Formulate the decomposition reaction and the corresponding mass action expression. $\ce{Ag3PO4}$ can be melted at $\pu{800°C}$ ...
Spinnel's user avatar
  • 41
-3 votes
1 answer
125 views

Why are p orbitals most important for stability? [closed]

Is there nice way to see/show/derive why p orbitals are so important for stability? Or asked differently: Why are elements with filled p orbitals on the right side of the periodic table? Why aren't ...
user3700272's user avatar
1 vote
2 answers
175 views

Organic solvents distillation for purification

I've realised that the majority of the solvent that we use in my lab are contaminated with grease (peaks at 1.26 and 0.86 ppm in $^1H$ NMR in $CDCl_3$), since they come in plastic containers (I guess ...
user avatar
0 votes
0 answers
22 views

NIST SRMs: Determination of the Validity Period

The National Institute of Standards and Technology (NIST) produces Standard Reference Materials (SRMs) of basically anything. That also means that things like peanut butter are among those SRMs. SRMs ...
Kreuvf's user avatar
  • 123
-2 votes
1 answer
217 views

Does resonance stablization of carbocation increase ease of $\ce{S_N1}$ reaction or decrease it due to delocalization?

(A) (B) In both of the cases when a nucleophile approaches for $\ce{S_N1}$ reaction a carbocation is formed in place of $\ce{Cl}$ atom. I know that the rate of $\ce{S_N1}$ increases with increase in ...
AltercatingCurrent's user avatar
6 votes
1 answer
360 views

Stability of beryllium isotopes

I have been reading about isotopes and their abundance on Wikipedia. It states that lithium has 2 stable isotopes, beryllium has 1 stable isotope (monoisotopic and mononuclidic) and boron has 2 stable ...
Proscionexium's user avatar
2 votes
1 answer
203 views

How long can a silicone and white spirit solution be stored without hardening?

I’ve heard that some people use a mixture of silicone and white spirit to waterproof their gear. How long this solution can be stored without hardening if it is stored in a closed hermetic bottle? If ...
JinSnow's user avatar
  • 439
-2 votes
1 answer
98 views

Stability of benzyl free radical hyperconjugated with a methyl group

In this picture, which one is more stable? My teacher says the second one as it has 4 alpha-Hydrogen whereas in the first picture the free-radical carbon has only 1 alpha-Hydrogen. That's why second ...
Isteak Ahamed Imon's user avatar
-2 votes
1 answer
248 views

Stability comparison between tropylium, cyclopropylmethylium and dicyclopropylmethylium cations

Write the correct stability order of the following compounds: I don't have any concern with estimating stability of (1), only (2), (3) and (4). Our teacher said that unless the carbocation has three ...
Sudarshan Kulkarni's user avatar
2 votes
0 answers
93 views

Stability of different tautomers of vitamin C

Above all four tautomers represent Vitamin C (Ascorbic acid) So here are some basic rules that I learnt. 1.Usually keto form is more stable due to bond enthalpy considerations 2.Enol form is stable if ...
Mithun M R's user avatar
3 votes
2 answers
402 views

Stability of hexazine

I read about a hypothetical compound called hexazine on Wikenigma. It's a 6-membered ring all of whose atoms are nitrogen and they form alternate single and double bonds just similar to benzene. But ...
Proscionexium's user avatar
0 votes
1 answer
72 views

Is there an international standard for rating the danger of chemical elements?

I'm writing a small little tool (something like an interactive periodic table) and I wanted a good "guesstimate" of the danger of certain elements, to visualize across said table. I could go ...
Mister SirCode's user avatar
5 votes
1 answer
488 views

Why is water present in "pure" nitric acid and RFNA and WFNA?

Various types of nitric acid have been used in rocket fuels as oxidisers (RFNA is red fuming nitric acid, WFNA is white fuming nitric acid) as they are often hypergolic with a wide variety of fuels. ...
matt_black's user avatar
  • 36.8k
-2 votes
2 answers
90 views

Are mixtures of finely ground solid fertilizer compounds stable? [closed]

If I had a combination of the following as finely ground powders, would it be relatively stable, or would they react to form other compounds? Sodium Nitrate Ammonium Nitrate Calcium Nitrate Potassium ...
quesoburguesa's user avatar
1 vote
1 answer
1k views

Why is the reaction rate of tert-butyl chloride solvolysis faster in 80% water/20% acetone, than in 70% water/30% acetone?

The solvent is polar protic, so the mechanism is SN1. However, I don't understand how the composition of water and acetone in the solvent affects the reaction rate.
songgio123's user avatar
1 vote
0 answers
884 views

What happens when iron(III) chloride is dissolved in ethanol?

I dissolved $\pu{25 mmol}$ $\ce{FeCl3*6H2O}$ in $\pu{25 ml}$ ethanol and got a clear ethanol solution of $\ce{FeCl3}$ 4 days ago. And I keep it in a drawer from light these four days. However, when I ...
Fikry TAN's user avatar
4 votes
1 answer
764 views

Does germanium(IV) chloride have to be handled under inert atmosphere?

I am finding conflicting information on the proper handling of germanium(IV) chloride. Is the liquid air/moisture sensitive? Does $\ce{GeCl4}$ have to be handled in a glove box?
seisenberg19's user avatar
0 votes
0 answers
157 views

Why does chlorine displace bromide

Found that chlorine will displace bromide, and iodide from their ion forms. According to my textbooks, this is because chlorine is more electronegative than bromine and iodine. However, the chloride ...
TheRavenSpectre's user avatar
0 votes
1 answer
126 views

Store Palladium Chloride in Solution

I have one gram of palladium chloride ($\ce{PdCl2}$) and I want to use very small quantities of it, in milligrams somewhere. It is not possible for me to get my hands on a scale that can measure that ...
Umer's user avatar
  • 101
-1 votes
1 answer
414 views

Which Group 16 elements form stable dihalides?

My textbook says that "except oxygen, all elements of group 16 form dichlorides and dibromides", while other sources quote that only Oxygen and Sulphur form dihalides and dibromides. Whereas,...
Chem1234's user avatar

1
2 3 4 5
11