0
votes
0answers
14 views

How to decide when halogenation of alkene follows which mechanism

Why not just two chlorine atoms added about double bond?
0
votes
1answer
9 views

Effective diffusion coefficient of a species in a heterogeneous mixture

I want to calculate the effective diffusion coefficient of hydrogen radical in a mixed-phase consisting of metal oxide, metal hydride and metal. I consider the interfaces to be diffuse. How can I ...
0
votes
0answers
17 views

Oxidation of hydrocarbons

What is an easy way to find the major and minor products of oxidation of hydrocarbons with various reagents ?
0
votes
0answers
14 views

why electronegative substitutes prefer equatorial position over axial

I'm wondering why more electronegative substituent (like Cl) beta glucose with equatorial orientation is prefered over alxial? If it's linked with anomeric effect , how?
0
votes
0answers
14 views

How to get ionic radii for coordination number = 12?

I am studying ABX3 perovskites, and I would like to calculate Goldschmidt tolerance factors for them. The A sites in these materials have a coordination number = 12. The Shennon's paper (R. D. ...
0
votes
0answers
10 views

Minimizing microbial growth in circulating water baths

I just cleaned what looked like algae out of a circulating bath made by Laura. I am not sure how to minimize their return. I may have used a mixture of ethylene glycol and water in the past. This ...
0
votes
0answers
20 views

Oxidation number of complex compound

Consider a complex K2[Cr(CN)2(O)2(O2)(NH3)] How would you find the oxidation number? Can't (O2) mean dioxide, Superoxide,peroxide which one should I choose ?
0
votes
0answers
10 views

Bonding in tetramminecopper(II) cation

I am totally confused about the bonding in $\ce{[Cu(NH3)4]^2+}$. Here are the thoughts that I had when I first attempted the problem: $\ce{Cu^2+ = [Ar] 3d^9}$ Due to crystal field splitting, $\ce{...
0
votes
1answer
22 views

What is the entropy of Cu(NO3)2?

I have searched for the entropy of copper nitrate in various tables across the internet* and all I could find was its Hf. Ullmann also didn't give an any better clue. If it was not measured and ...
0
votes
0answers
10 views

Initial Volume and Percentage [on hold]

I have try all this questions and I just want to confirmed my answers. 1. 60.83L 2. 44.90% 3. 8.59% (https://i.stack.imgur.com/YNH2g.jpg)
3
votes
1answer
40 views

Bonding in Zeise's salt

I am not sure I completely understand the bonding in coordination compounds formed by donation of pi electron cloud by the ligands to the central atom. For example, consider Ziese's salt: I came ...
0
votes
1answer
12 views

How does Borax Solution act as a buffer?

What type of buffer is it? If it's a Weak Acid-Conjugate Base type of buffer, what is the weak acid and conjugate base?
1
vote
1answer
10 views

Extrapolating from a calorimetry lab to find a new delta T with different volumes and grams of substance

So, we just finished an AP chem lab where the question was basically: Given the results of the lab were that $\pu{5 grams}$ of $\ce{CaCl2}$ and $\pu{45ml}$ of water produced a $\pu{13.33 ^\circ C}$...
0
votes
0answers
14 views

Finding equilibrium concentration [on hold]

Plz answer 233 question its related to physical equilibrium
0
votes
0answers
17 views

What is the relationship between polarity and boiling point?

What is the relationship between polarity and boiling point? How would I use that knowledge to answer this question: $\ce{CH2F2}$ has a dipole moment of $1.93\, \mathrm{D}$ and a boiling point of $–...
-2
votes
0answers
12 views

Micro Zippette Hand-Held Dispenser [on hold]

Has anyone ever used this Micro Zippette Hand-Held Dispenser? I found it on an online chemical store brumer
-1
votes
0answers
10 views

evaporation of ethanol in a closed system [on hold]

how can I prevent the evaporation of ethanol in a closed system circulation of a mixture of ethanol and water which a high temperature reaches to 70 c?
-1
votes
0answers
7 views

Calcute the dosage of aqueous extract to powder?

Can somebody explain to me how to calcute the dosage in powder? The powder (125 g) of each plant were macerated in 200 mL of distilled water for 12 h at room temperature and were then filtered to ...
1
vote
0answers
7 views

Mixing dilute hydrochloric acid and battery acid

I was doing an experiment on gold recovery. When I added some gold platted pins to battery acid nothing seemed to happen.I impatiently added some duluted hydrochloric acid labeled 20%, immediately ...
-3
votes
1answer
23 views

Which is more soluble in water ammonia or Sodium dodecyl sulfate

I've tried looking this up and can't seem to find the solubility of SDS if any one knows the answer I would really appreciate it. Which is more soluble in water ammonia or Sodium dodecyl sulfate. ...
0
votes
0answers
19 views

The aromaticity of benzyne

Benzyne consists of three resonance forms (aryne, cumulene and diradical). Is benzyne itself aromatic? And what about its triple bond and diradical forms?
-1
votes
0answers
17 views

Charges on adjacent carbon in resonance

$$\ce{H2C=CH-CH=CH2 <-> H2C=CH-\overset{+}{C}H-\overset{-}{C}H2}$$ Is this a correct resonance structure? Almost all the books just mention this $$\ce{H2\overset{+}{C}-CH=CH-\overset{-}{C}H2}$$ ...
0
votes
0answers
9 views

finding out fractions of ions(different valencies/charges) of an element in non-stoichiometric compounds

Analysis shows that nickel oxide has the formula $Ni_{0.98}O_{1.00}$. What fractions of nickel exist as $Ni^{2+} $and $Ni^{3+}$? What i did: Let the number of $Ni^{2+}$ and $Ni^{3+}$ atoms be $x$ ...
2
votes
1answer
18 views

Why does nucleophilic aromatic substitution occur at C-2 and C-4 of pyridine?

In the following reaction of 2,3,4-tribromopyridine with sodium methoxide in methanol,[1] why are only the C-2 and C-4 bromines replaced with methoxy groups? Why doesn't the bromine at C-3 also get ...
0
votes
1answer
12 views

what should be the onset potential using cyclic voltammetry?

I am working for PEM fuel cell cathode material. I am confused regarding the onset potential determination for my catalyst (CV attached, fig 1 is complete CV while fig 2 is its zoom image for clear ...
1
vote
1answer
27 views

Classification in Stereoisomerism

I was trying to understand stereoisomerism. I am having trouble creating a 'flow chart' of Stereoisomerism. While there are many sources available over the internet and books, I don't find a standard ...
0
votes
0answers
8 views

How to precipitate Urea in a blood sample?

I am trying to use IR spectroscopy to measure total protein in blood. Urea creates a interference in that range. I thought about precipitating urea to reduce its interference but how can i do that?
-1
votes
0answers
10 views

1-3 Cyclobutadiene Resonance or no Resonance?

Does resonance occur in 1-3 Cyclobutadiene? There is π- π conjugation present in the system, however, unlike Benzene, the bond lengths are not equal, and the molecule is not a perfect square. Why? 
2
votes
0answers
29 views

Lewis acids as ligands

Usually Lewis bases as my textbook says: According to me its not compulsory for a ligand to be a Lewis base, as $\ce{BF3}$ is a Lewis acid and can act as a ligand by accepting electrons from a ...
0
votes
0answers
16 views

Production of benzoic acid using chlorine

I've come across a question that says: Which of the following compounds can we use with excess of NaOCl in order to produce benzoic acid? The compounds are: isopropanol, acetophenone, benzhydrol ...
-1
votes
0answers
23 views

Will chlorine acquired from electrolysis of NaCl lose its charge eventually? [on hold]

I want to separate $\ce{Na+}$ ion and $\ce{Cl-}$ ion from $\ce{NaCl}$, how can I do so easily, after the separation how can i get negatively charged chlorine into a separate container? Will the ...
0
votes
0answers
14 views

Thermodynamics and thermo chemistry [on hold]

Explain Enthalpy concept and about how to calculate heat of neutralization, bond energy, combustion etc
0
votes
0answers
13 views

Why is s-s sigma overlap weaker than p-p sigma overlap?

s-s sigma(head-on overlap) bonds are weaker than s-p sigma bonds which are again weaker than p-p sigma bonds. But shouldn't it be the other way around as s orbitals have higher penetration power than ...
2
votes
1answer
30 views

Molpro - Simple explanation of OCC, CORE, FROZEN and CLOSED orbitals

I'm beginning with quantum chemistry and I'm supposed to do some ab initio calculations with Molpro. The problem is, I don't understand the orbital specification very well. Let's say, I have the ...
0
votes
1answer
39 views

C-4 oxidation of octanoic acid to 4-oxooctanoic acid

I am leading a project in which I am attempting to synthesize 4-oxooctanoic acid in a (mostly) biological pathway. Currently, I have reached a dead-end. I have a way to create octanoic acid through ...
4
votes
1answer
34 views

What is the Crystal System of MoS2?

I'm confused about the crystal system of MoS2. In the case of the monolayer MoS2, it has 3-fold rotation symmetry when viewed from the top of its unit cell (c-axis). Even in the case of bulk (AB ...
-1
votes
0answers
27 views

What is the IUPAC name of given compounds (in photograph)? [on hold]

I am not able to identify, what suffix should I use in these two compounds. Please also explain the method of finding it.
-1
votes
0answers
19 views

How to IUPAC name a cycloalkane when there are two different substituents on the same carbon. [on hold]

For example if there was a Cl and CH3 off of carbon one and an ethyl off of Carbon 3 in the cyclohexane ring
-1
votes
1answer
25 views

Acidic nature of hydrogen in hydroxides linked to biphenyl

I thought that as option (d) has more number of double bonds in conjugation, it will stabilize the anion better . But the answer given is (c) .Can somebody please explain? I tried to draw the ...
-1
votes
1answer
15 views

Can methyl halide be used in Wurtz reaction?

Yields of product(alkanes) are best for 1°(60%) and least for 3°(10%) alkyl halides. Can methyl halides be used in Wurtz reaction? Would it produce a good yield?
-1
votes
0answers
25 views

Why atoms in covalent molecules do not possess any charges? [on hold]

In the $\ce{H_2O}$ molecule, oxygen has $10$ electrons ($2$ inner plus $6$ valence plus $2$ electrons from hydrogen) and $8$ protons therefore it should have $2-$ charge, but it doesn't.
-2
votes
1answer
20 views

Why is ammonia removed before the yield is attained in Haber process?

Why does removing ammonia from product mixture before reaching the yield of 20% can increase the amount of NH3 produced per unit time?
-1
votes
0answers
19 views

Oxidation of Graphite with HNO3 [on hold]

It is given in my book that nitric acid oxidizes graphite to either mellitic acid (Benzene Hexacarboxylic acid) or, with additional HF, graphite oxide. Can somebody suggest a mechanism for this ...
5
votes
0answers
58 views

What compound has the strongest optical rotation of polarised light?

A question recently asked here whether compounds know to be chiral can have non-measurable optical rotations: Are there chiral compounds that don't rotate plane-polarized light?. Apparently they ...
0
votes
3answers
96 views

Combustion analysis methodology question

I am questioning the answer key of an exam question my chemistry professor has given, because I think there is a flaw in the methodology of the exam answer. I have worked out my solution using my ...
-1
votes
1answer
27 views

Are there gases that spontaneously combust when mixed with oxygen?

Is there a known gas that would combust by there mere action of mixing with oxygen? So, we could put this hypothetical gas in a balloon, and if the balloon popped, it would combust and explode.
-1
votes
0answers
13 views

Electrochemistry- Impedance and Nanotechnology [on hold]

Lots of my Nanotechnology colleagues are asking about understanding impedance in my Electrochemistry course. Can anybody let me know what is the importance of understanding relationship between ...
0
votes
0answers
6 views

Finding molar fractions of components given density of total gas at stp

How can we find the molar fractions of n2 and o2 given that the whole gas has a density of 1.4 g/l at stp? I have seen solutions of this problem that first calculate the mass per volume of the ...
-3
votes
0answers
14 views

Chemical Formula [on hold]

Nitrogen forms a number of compounds with oxygen, for example nitrous oxide, N2O, is 63.65% N by mass. A second compound, which contains two atoms of nitrogen per molecule, is 25.94 % N by mass.How ...
6
votes
1answer
349 views

Are there chiral compounds that don't rotate plane-polarized light?

I know that meso compounds have chiral centers but don't rotate plane-polarized light, and I know that there can be non-traditionally chiral compounds (e.g. ones with large substituents that prohibit ...

15 30 50 per page