Questions tagged [reference-request]
This tag is for questions looking for a single specific, or a small number of (citable) references.
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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 ...
0
votes
0answers
34 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 ...
4
votes
1answer
37 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 ...
-1
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0answers
26 views
Do oximes give tollens test? [closed]
Do oximes give tollens test?If it is the case,what is the product?I didn't find it in any trustworthy reference book.
0
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0answers
15 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
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0answers
44 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
54 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 ...
11
votes
2answers
178 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 ...
1
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0answers
23 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
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0answers
142 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 ...
7
votes
3answers
250 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
50 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) ...
3
votes
2answers
129 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 ...
2
votes
1answer
225 views
Reduction of 2-cyclohexenone to cyclohexanol
Is $\ce{NaBH4}$ a suitable reducing agent for the conversion of 2-cyclohexenone to cyclohexanol?
In Clayden (page 506, second edition), I have found the reduction of cyclopentenone to cyclopentanol ...
3
votes
2answers
109 views
Proof of the chemical potential formula
My textbook as well as Wikipedia both state the formula $\mu_A = \mu_A^0 + RT\ln\{A\}$ which gives the chemical potential $\mu_A$ of a chemical species $A$ as function of the standard chemical ...
1
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1answer
75 views
What is the solublity of water in liquid carbon dioxide at low temperature?
The solubility of water in liquid carbon dioxide has been investigated by Hosmer W. Stone in 1943 from
-29 to about 22 °C.
Is there any research done on the solubility of water in liquid $\ce{CO2}$ ...
1
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1answer
61 views
Where can I find the standard molar entropy for ammonium bicarbonate?
I'd like to know the standard molar entropy S0solid for ammonium bicarbonate to use in an example in class, to calculate ΔS0 for the reaction, NH4HCO3(s) → NH3(g) + H2O(g) + CO2(g).
Already checked: ...
-1
votes
1answer
65 views
Entropy change of evaporating NaCl [closed]
What is $\Delta S$ for this process?
$$\ce{NaCl(s) -> NaCl(g)}$$
(A reference that I could quote would be ideal.)
-1
votes
1answer
25 views
Source for medium quantities of salts [closed]
Where are good sources for medium quantities (10-1000kg) of chemicals, particularly salts?
For quantities <10kg, I know of lots of options from lab suppliers (Sigma Aldrich, Alfa Aesar, etc). ...
0
votes
1answer
63 views
How to synthesize tetrabutyl titanate from titanium dioxide powder?
How do you synthesize tetrabutyl titanate $(\ce{[CH3(CH2)3O]4Ti})$ from titanium dioxide ($\ce{TiO2}$) powder? As I know, we can get $\ce{TiO2}$ from tetrabutyl titanate, but how can we do the ...
3
votes
2answers
163 views
A basic question about tetramethylammonium hydroxide
This is a follow-up to the question here. There is an answer claiming that tetramethylammonium hydroxide (TMAH) is a suitable strong base that can be used instead of the usual alkalies to reach pH 14....
0
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0answers
55 views
Calculating rate determining step in C-H bond activation reactions
In C-H bond activation reactions, after performing isotope substitution experiments with deuterium, how is the rate limiting step of the reaction determined? I'm looking for references on performing ...
1
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0answers
29 views
Readings about chiral resolutions at the undergraduate level
Does anyone know of a resource which clearly explains the scientific theory and experimental methods involved in chiral resolutions?
I have access to the American Chemical Society, Tetrahedron, ...
8
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0answers
187 views
How are polarizabilities measured experimentally?
Most common spectroscopies that produce either a full spectrum, a tensor, or a scalar value have a specific instrument associated with them that is relatively self-contained and not custom. For ...
5
votes
0answers
294 views
Reaction rate constants for methane combustion
I can't find a rate constant or activation energy for the methane combustion reaction given by:
$$\ce{ CH4 + 2O2 -> CO2 + 2H2O}$$
Do all reactions have a rate constant? The NIST web site lists ...
0
votes
1answer
50 views
Thermal oxidation of gold(I) sulfide
As far as I know the chemistry of $\ce{Ag}$ and $\ce{Au}$ are almost the same; because $\ce{Ag}$ belongs to the 4d series and $\ce{Au}$ belongs to the 5d series, we know the size of 4d and 5d are ...
9
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0answers
231 views
Is it possible to self-teach yourself most of organic chemistry and biochemistry without access to a lab or university resources? [closed]
I'm stationed on a US Navy warship and I often wonder if its possible to master these subjects without access to a college instructor. I've been reading introductory books on organic chemistry and ...
10
votes
2answers
416 views
Image of crystal structure
Is there any websites or resources where I can get a good image of a certain crystal structure? In my case I'm looking for lead(II) tungstate $\ce{PbWO4}$ and I can't find a vivid graphic on google (...
4
votes
0answers
65 views
How to tell 'orthokinetic' apart from 'perikinetic' based on their prefixes?
During a test in colloid and surface chemistry, students were asked to distinguish between two terms: orthokinetic and perikinetic coagulation.
The rate of aggregation is in general determined by ...
8
votes
1answer
134 views
What is “physicist's water”?
There is a statement on page 60 of this dissertation:
the "physicist's water molecule" ($\ce{O-H = 1.1 \mathrm{\mathring{A}}, \angle HOH = 104^\circ}$)
I understand it to be a model similar to the ...
2
votes
0answers
41 views
Can someone suggest me important references for deriving EOM in MCSCF?
I am currently starting a project dealing with MCSCF method. Can someone please give me references (papers or lecture notes are preferred) which may be considered as the "corner stones" in the history ...
0
votes
2answers
160 views
Do auto-catalytic aromatic compounds capable of forming self-replicating molecules exist?
I want to know are there any aromatic compounds able to catalyze their own synthesis? Do aromatic compounds with molecules capable of self-replication exist?
P.S.I'm looking specifically for ...
7
votes
1answer
240 views
What are introductory level books on chemical engineering?
I'm currently enrolled in a chemical engineering course in my college, and in my first year, I'd like to get a nice introductory book on that field of study.
I'd prefer that the book covers several ...
0
votes
1answer
56 views
What is the reaction mechanism of a selective catalytic reaction with urea?
What is the reaction mechanism of the following reaction:
$$\ce{4NO + 2(NH2)2CO + O2 -> 4N2 + 4H2O + 2CO2}$$
I expect that the catalyst is vanadium oxide and titanium oxide.
Where can I find a ...
1
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0answers
193 views
How close are we to building an actual nanobot? [closed]
I want to know how far current nanotechnology is from creating an actual real-world nanorobot? Also, does such a thing actually exist, or is it just a nice name for an umbrella term to show off to the ...
13
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2answers
864 views
What is “chemical pressure”?
While reading some publications on solid superconductors, I encountered a term "chemical pressure" a few times, which is usually attributed to the changes of superconducting transition temperature $T_\...
3
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0answers
59 views
Do any efforts to construct artificial biochemistries exist and what compounds are they based on? [closed]
I'm a researcher interested in the fields of origins of Life, astrobiology and theoretical biology in general but I must admit I think my knowledge of chemistry outside biochemistry is a little bit ...
20
votes
1answer
1k views
What is the nature of the bonding in cyclotriphosphazene?
The bonding in $\ce{(NPCl2)3}$ (and other compounds of the form $\ce{(NPR2)3}$) has historically been described using the ‘Dewar island model’.
By analogy to benzene, $\ce{(NPCl2)3}$ is π-electron ...
1
vote
1answer
193 views
House-hold chemistry experiments for a high-school student [closed]
I want to experiment the things which we learn in chemistry as a twelfth grader.I want to do them at my home but I'm not supplied with enough reactants.What can I do by using such reactants.
I tried ...
11
votes
1answer
148 views
Possibility of π–π stacking in non-aromatic systems
Is it possible to have π–π stacking for non-conjugated double bond systems?
For example, can the carbonyl groups of two urea molecules participate in π–π stacking? Although urea prefers to stay in ...
1
vote
1answer
97 views
Does aqueous component contribute to the equilibrium constant?
Consider an equilibrium reaction with an aqueous solution $\ce{A(aq)}$ in equilibrium phase with gas:
$$\ce{A(aq) + B(g) <=>[$K_\mathrm{eq}$] C(g)}$$
Would the equilibrium constant have aqueous ...
2
votes
1answer
77 views
Discrepancies in calculating free energy values listed in Stumm and Morgan
I am hoping someone can help me with a clarifying a calculation on a fundamental thermodynamic understanding of reactions. Below is Table 2.5 from Stumm and Morgan's Aquatic Chemistry.
Table 2.5. ...
7
votes
2answers
853 views
Is there an iron–iron bond in diiron nonacarbonyl?
Diiron nonacarbonyl, $\ce{[Fe2(CO)9]}$, is often depicted with an Fe–Fe bond as shown at the left-hand side:
The Fe—Fe bond is usually invoked in order to (1) explain the observed diamagnetism and (2)...
1
vote
0answers
44 views
What's the most trusted source for bond lengths? [closed]
I'm doing some computational work and am manually inputting Z-matrices for the molecule (no GUI support for my program). For this, I need bond lengths:
I tried Herzberg's book
I tried a basic ...
13
votes
1answer
131 views
What function is used to graph the potential curve of two hydrogens with parallel spins?
TL; DR
I am asking for
an analytic potential curve function for the triplet state of $\ce{H2}$ (preferred) with experimental parameters, or
experimental data (enough points to realise a smooth-...
2
votes
0answers
26 views
Help finding a thixotropic suspension with specific properties for 3d printing
I currently doing research on 3d printing on circuit boards. The technique we are using is to put a conductive material, I.e ceramics/metal in a gel/polymer, to print the suspension and then when is ...
-5
votes
1answer
54 views
Handling reactions in chemistry [closed]
Q:1 So far, after studying chemistry for two years I am unable to figure out any well-defined methodology of handling a particular reaction either in General or Organic chemistry. So I would ...
4
votes
0answers
65 views
Book for understanding synthetic techniques and apparatus(with pictures) [closed]
Is there a standard textbook to understand numerous laboratory apparatus and the assembly techniques that can be used for carrying out different processes (with pictures)?
I have been cleaning my lab ...
5
votes
0answers
79 views
Advanced Quantum Chemistry Reference for Reactivity Phenomena
I'm currently in organic synthesis seeking to develop quantitative "physical" (that of a physicist), rather than "chemical", intuition for areas where traditional VSEPR/ MO models cannot fully ...
2
votes
0answers
94 views
Reaction of PLA plastic with methane or carbon dioxide
PLA (polylactic acid) plastic is commonly used for 3D printing, and I would like to create a 3D printed part that can be used in an experiment with methane ($\ce{CH4}$) and carbon dioxide ($\ce{CO2}$) ...
