Questions tagged [reference-request]
This tag is for questions looking for a single specific, or a small number of (citable) references.
289
questions
4
votes
1answer
55 views
Timescales in Chemical Analysis
Has anyone seen a comparative list of typical run times of the techniques used in analytical chemistry? I am making a list of rough timescales of analytical techniques (for a slide). Assume that the ...
1
vote
0answers
18 views
How to dissolve PLA/PCL/PMMA?
I have a research about electrospun membrane synthesis where I dissolve PLA pellets in chloroform:methanol (3:1) for 3 hours and also PCL pellets in chloroform:methanol (3:1) for 3 hours too. Another ...
0
votes
0answers
36 views
Supposed low temperature CaC2 synthesis
I came across an interesting reaction on allreactions.com under silicon tab:
SiO2 + 5C(coke) + CaO = Si + CaC2 + 3CO (800-1000°C)
Unfortunately the website doesn't provide sources and I wanted to read ...
0
votes
1answer
47 views
Diborane reduction
I am stuck at a step in reduction of alkene using $\ce{B2H6}.$ I assume that step 1 is the addition of borane to alkene. After that a water molecule attacks $\ce{-BH2},$ it being a Lewis acid. ...
9
votes
3answers
2k views
What is “super” in superphosphate?
This question is inspired from a previous question(marked unclear). I don't know about the context of that question but I was intrigued by a statement in that question:
Superphosphate is used ...
1
vote
0answers
27 views
Determining the composition of basic copper sulfate by titrimetry
A colleague shared an undergraduate level classical gravimetry/titrimetry experiment on determining the stoichiometry of basic copper sulfate. I am looking for a reference for this type of experiment. ...
6
votes
2answers
908 views
What is the most convenient way to prepare ferrous oxide (FeO) in the laboratory?
The Wikipedia page for ferrous oxide states that $\ce{FeO}$ can be prepared by the thermal decomposition of iron(II) oxalate, with the following reaction:
$$\ce{FeC2O4 → FeO + CO2 + CO}$$
And that ...
1
vote
0answers
76 views
Solubility product constant of copper(II) bromide in water
One of the questions from chegg.com mentions $K_\mathrm{sp}(\ce{CuBr2}) = 6.3\cdot 10^{-10}$, but I suspect this value might be incorrect.
Could anyone confirm or refute that $K_\mathrm{sp}$ value?
...
6
votes
0answers
110 views
Where to find experimental spin-orbit coupling constants?
I am searching for experimental spin-orbit coupling constants, particularly for main group elements and Cr(0) to calculate correlation consistent Composite Approach (ccCA) energetics. This method ...
2
votes
0answers
37 views
What is the activation energy barrier of uncatalyzed nitrogen fixation?
I'm interested in the activation energy ($E_\mathrm a$) of uncatalyzed aqueous nitrogen fixation:
$$\ce{3 H2 + N2 -> 2 NH3}$$
Biology performs this reaction with the nitrogenase enzyme at room ...
0
votes
1answer
26 views
How to distinguish mass concentration and density?
I am writing a proof where I have to mention both with density and of a material and mass concentration (mass/volume) of a material.
I am using the letter $\rho$ to represent density, and I didn't ...
0
votes
1answer
55 views
Reference on Pople basis set
I need to write reference on 6-311++g(d,p) basis set in my work where I used it on atoms of I-II periods. Does anyone know where it was first published?
1
vote
0answers
28 views
Bond dissociation energy calculation
I am looking for methods to determine the dissociation free energy in a precise way, ideally from a simulations. My hope is to get the most precise values possible that are specific to the structure ...
4
votes
1answer
55 views
What chemical could dissolve low-density polyethylene?
What chemical could dissolve plastic aside from acetone? Preferably, low-cost and environmentally friendly. Any suggestions would be helpful.
I'm targeting for thin plastic (low-density polyethylene)....
0
votes
2answers
86 views
Density and concentration of hydroiodic acid [closed]
I weighted my hydroiodic acid sample: 25 ml weight 34.1 g, so the density is about 1.364 g/ml.
I want to know its concentration based on density. Does anyone have the corresponding density chart?
5
votes
2answers
173 views
Derivation of time probability distributions for single molecule kinetics
If we have a protein $\ce{A}$ that can bind to protein $\ce{B}$:
$$\ce{A + B <=>[$k_\mathrm{fwd,1}$][$k_\mathrm{rev,1}$] AB}$$
and the bound complex $\ce{AB}$ can be converted into $\ce{C}$:
$...
-2
votes
1answer
40 views
Can anybody recommend me a Calculus Based General Chemistry textbook? [duplicate]
I'm looking for a Calculus Based General Chemistry textbook. I checked Atkins Chemical Principals but I didn't liked it that much. I'd be awesome if I had some more options 😃
Thanks!
3
votes
1answer
49 views
What's the densest alkali metal?
This was asked in a school exam of mine, GCSE curriculum, exactly as it was worded on the title. I found this question a bit vague, and answered it francium, however of course francium is just an ...
1
vote
1answer
96 views
How often is the IUPAC Goldbook Updated?
I was wondering how often does the IUPAC update its Gold Book, ie, IUPAC Compendium of Chemical Terminology - the Gold Book.
It poped in my mind when I saw this question about jellium aromaticity, ...
2
votes
1answer
38 views
Book reference for electronic occupation of TM
Is there a book I can reference that has a table like this? I can't reference an online source on my thesis and all the pictures I have found online like this don't make their reference explicit.
...
7
votes
1answer
92 views
Reference for electronegativities of different metal oxidation states
A long time ago I was researching the effect of the self regulatory response in Fe and Co. I found that my results made sense based on the idea of the electronegativity of the ions considered. I found ...
5
votes
2answers
721 views
Reaction of borax with NaOH
How does borax react with NaOH?
My textbook says that sodium peroxoborate is formed. I couldn't find the reaction anywhere else.
Can anyone verify as well as explain it?
2
votes
0answers
50 views
Which material are piezoelectric buzzers made of?
Which material are these buzzers made of?
Does it depend on the manufacturer or they all are made of the same material? The Wikipedia page does not say anything about the material. I found some ...
1
vote
0answers
47 views
Does Raney nickel deprotect acetals?
I know that Raney nickel can deprotect thioacetals. Can it deprotect acetals as well?
I found this image which shows that it deprotects and removes many protecting groups. But there was no reference ...
13
votes
1answer
1k views
What is the least dense liquid under normal conditions?
What is the least dense liquid under normal conditions, room temperature, one atmosphere of pressure, doesn't combust upon contact with air, also wouldn't kill a human just for being in the same room ...
2
votes
0answers
63 views
Antisymmetrized Product of Strongly Orthogonal Geminal (APSG) method
To get a deeper understanding of electronic structure methods, like Hartree-Fock, MP2, and Coupled Cluster method, there are many small programs (codes) available in Python, C++ or Fortran, for ...
21
votes
2answers
3k views
Storing hydrofluoric acid before the invention of plastics
The first person to synthesize hydrofluoric acid in large quantities was Carl Wilhelm Scheele in 1771. This acid is known for its ability to corrode glass and metals.
What materials were the ...
10
votes
1answer
169 views
Is isobutyl chloride or ethyl chloride more reactive in an SN1 reaction?
Compare the rate of $\mathrm{S_N1}$ reaction in the following compounds:
We see that both compounds form primary carbocations. However, there is more hyperconjugation in the second compound as ...
1
vote
0answers
38 views
Which of these chlorides is more reactive? [duplicate]
We do learn that for $\mathrm{S_N1}$ reaction the rates are tertiary > secondary > primary > methyl. The reasons mentioned are usually inductive and hyper-conjugative effect.
But which of the ...
9
votes
2answers
529 views
How to determine omitted units in a publication
I have found a 1954 paper in J. Am. Chem. Soc. which gives various temperatures in degrees but does not specify units.
A snippet of the introduction is:
Titanium reacts appreciably with fluorine ...
4
votes
0answers
75 views
How to get the second electron affinity of tellurium?
I need the value of the second electron affinity of Te, i.e. the energy change associated with the attachment of an electron to a $\ce{Te-}$ anion
$$\ce{Te- + e- -> Te^{2-}}$$
In the books (e.g. J. ...
0
votes
1answer
84 views
Kb values of N,N-dimethylaniline derivatives [closed]
I need the $K_\mathrm{b}$ values for ortho-, meta- and para- positions of the following compounds:
I've looked and couldn't find them anywhere.
13
votes
2answers
2k views
Melting point of aspirin, contradicting sources
Querying wolfram alpha for the melting point of aspirin (link) returns $\pu{140 °C}$. The Wikipedia page for Aspirin lists $\pu{136 °C}$ instead, citing this book.
How am I supposed to know which ...
1
vote
1answer
27 views
Is there any book or text where ionic radius of elements are given?
So my research has me looking for ionic radius characterization. If anyone could post any link or give the name of any book where ionic radius of all elements are given that would be really great?
-1
votes
2answers
80 views
Equilibrium constant for complex cobalt ion
What is the equilibrium constant for the $\ce{Co(H2O)_6^{2+}(aq) + 4 Cl-(aq) <=> CoCl_4^{2-}(aq) + 6H2O(l)}$?
I've looked at various sources but none seem to yield the actual equilibrium ...
9
votes
2answers
596 views
Inorganic chemistry handbook with reaction lists
There is a handy handbook on common inorganic substances' properties called "Reactivity of Inorganic Substances" (eds. R. A. Lidin, V. A. Molochko, and L. L. Andreeva). It was originally written in ...
1
vote
1answer
90 views
Cerium (CeO) behavior in Glass Polishing?
I am basically working in semiconductor industry and I specifically taking care of CMP (Chemical Mechanical Polishing). We did polish glass (borosilicate type of glass) and we are using slurry (which ...
-1
votes
1answer
51 views
What is the molar extinction coefficient of azorubine (carmoisine, E 122)
I'd be grateful for the molar extinction coefficient ε of azorubine at the absorption maximum (about 520 nm), with an authoritative reference.
1
vote
1answer
44 views
What is a good resource for learning about the intermolecular bonding in water beyond high school? [closed]
I'm writing a paper for school on boiling water at various temperatures and pressures, but only noting cases wherein high temperatures were achieved without boiling under low pressure (metastable ...
4
votes
1answer
46 views
How to show a band structure for water?
This question is generated by my attempt to answer this one. I thought I could demonstrate that electronic conduction in water is possible because of the impact of an electric field on the band ...
0
votes
0answers
16 views
What could some good source for problems in organic chemistry for undergrad level? [duplicate]
I have read Morrison Boyd Organic Chemistry and the exercises given at the back are quite interesting and some of them require a lot of critical thinking. I want to practice more such problems.
Do ...
0
votes
0answers
57 views
Looking for experimental data for titration curves
I am looking for real, open source and free experimental dataset (not image, scan of table) of acid/base titration curves: pH versus titrant volume for many combination (strong/weak acid/base, ...
3
votes
1answer
74 views
Model of an ideal liquid in chemistry
In chemistry there are ideal models/concepts of ideal crystal, ideal gas and even ideal solution, but there is no model/concept of ideal liquid.
In physics (fluid dynamics, to be precise) there is a ...
14
votes
2answers
676 views
How can benzaldehyde have a pKa of 14.9?
There are numerous websites out there which claim that the pKa of benzaldehyde – C6H5CHO – is 14.90. (Just do a Google search for benzaldehyde pka to see what I ...
2
votes
0answers
95 views
Carbon monoxide from activated charcoal filters
We use activated charcoal in air filters of the ventilation system to remove pollutant vapours from the exhaust air. Before the filters, the air is heated a bit to avoid condensation of water. ...
2
votes
0answers
167 views
What studies show that d orbitals don't play an important role in covalent bonding? (> period 2 elements) [closed]
Take a look at all the following molecules: $\ce{SO3^{2-}}$, $\ce{SO2}$, $\ce{SO4^2-}$, $\ce{PF5}$ and many more you can add. In all these there is a controversy of one of these two types:
Is formal ...
9
votes
3answers
333 views
What is Nesbet's theorem?
In a talk by Frank Neese there was a slide with title "Nesbet's theorem" and an equation indicating something like "if your wavefunction has the double excitation amplitudes correct, then you can get ...
1
vote
0answers
65 views
Does CF3COOH undergo decarboxylation ? Why or why not? [closed]
Does $\ce{CF3COOH}$ undergo decarboxylation ? Why or why not?
Attempt:
I feel it should decarboxylate because $\ce{CF3-}$ carbanion must be stable due to fluorine's -I (electron withdrawing) ...
1
vote
1answer
66 views
Does Henry's law depend on curvature of gas/liquid interface?
Could you tell me Henry's law depends on curvature of gas/liquid interface or not? It would be better with references.
3
votes
2answers
168 views
Where can I get potential energy surface for simple molecules?
I'm looking for potential energy functions for simple molecules, such as water or hydrogen sulfide. I only need the region around the equilibrium geometry, preferably as a Taylor series expanded in ...
