# All Questions

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58 views

### What does it mean by non-bonding p pi orbital?

In a paper by Peng et. al.,[1] I read about the valence band maximum of $\ce{TiO2}$ consists of non-bonding O pπ orbitals ... the valence band maximum (VBM) consists of non-bonding O pπ states What ...
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### Apparent inversion of oxidation state of sulfate ion using minimal basis set

It is well known that the sulfate ion has essentially no 3d-2p bonding; hence I used the minimal basis set(STO-3G) for the NBO calculation I did via Gaussian, just to check it. However, I got a ...
103 views

### Which amines show N−N coupling reaction?

We add 1 equivalent of $\ce{KCN}$ followed by catalytic reduction via Lindlar's reagent $(\ce{H2}/\ce{Pt})$ to 4-chlorobenzyl chloride (1). Verify whether the product (P) obtained will undergo an N−N ...
60 views

### Determine anion radius in FCC cell

The edge length of an FCC cell is $\pu{508 pm}$. If radius of cation is $\pu{110 pm}$, the radius of anion is? My approach: $$(2R_{\text{cation}}+2R_{\text{anion}})^2=2a^2$$ Which on simplification ...
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### How to purify and extract pure indium out of a solution

I have been searching the internet for a while now and nothing did answer my question in a concrete way. Let's say I have a solution of indium mixed with oxalic acid and possibly some other (unknown) ...
20 views

### Can iron oxide nanoparticles form with diamagnetic surfactants?

When using charged surfactants, such as oleic acid the preparing iron oxide nanoparticles, what would result from utilizing a charged surfactant with a negative magnetic susceptibility?
32 views

### Assessing dangers of light/radiation to gasoline/oil and its vapors?

I was thinking about precautions you if you wanted to perform visual inspections of a barrel of oil and that made me start wondering. Are there any major safety risks associated with using light ...
48 views

### Ethylene/Propylene Glycol

Can propylene glycol be mistaken for ethylene glycol in a blood sample test using gas chromatography with a flame ionization detector?
40 views

### Does a larger bond energy in reactants mean a more exothermic reaction?

In the book "Combustion Physics" for C.K Law, page 42, it is stated that: The parameter that has the next strongest influence on [adiabatic flame temperature] $T_{ad}$ is the $C/H$ ratio of ...
40 views

### Major product in the reaction of alcohol with unsymmetrical acid anhydride

When alcohol reacts with symmetrical acid anhydride to form ester. We have the following reaction, But if the acid anhydride used is unsymmetrical how can we identify the major product? For example ...
26 views

### At equilibrium, which one of the following is always Zero? [duplicate]

At equilibrium, which one of the following is always zero? (A)∆H (B)∆S(Total) (C)∆S(System) (D)∆G° I know that at equilibrium ∆G=0, and was facing difficulty in connecting the above mentioned ...
36 views

### Prepairing a Sodium Acetate buffer - Meaning of molarity

We have instructions to prepare a "50 mM Sodium Acetate, pH 5 solution". I am not entirely sure what does the molarity refer to in this case. Does it mean: Add Sodium Acetate salt up to 50 ...
27 views

### Side-chain Oxidation vs Oxidative Cleavage

When the above compound is subjected to acidified $\ce{KMnO4}$, can both side chain oxidation and oxidative cleavage of $\ce{C=C}$ bond occur? Or will one have priority over the other?
28 views

### Height of FCC arrangement

I have read that height of HCP arrangement is given by $\mathrm{4r\sqrt{\frac23}}$ as distance between consecutive layers is $\mathrm{2r\sqrt{\frac23}}$(in both FCC and HCP). If that is the case, then ...
41 views

### Determining ppm concentrations from food label information for ICP-OES analysis?

Overview: I am looking to determine what ppm values of trace metals are present in a particular formula while considering digestion, dilution, and detection limits for ICP-OES. For example, one ...
4 views

### With functions as functions of special coordinates in Gaussian g09 [migrated]

I would like to generate wave functions as functions of spatial coordinates (X, Y, Z) in Gaussian G09. How might I go About doing this? I am using Linux and my preferred visualization software is ...
657 views

### Materials for McBride's Freshman Organic Chemistry at Yale University

I have been looking over the online Organic Chemistry course taught by McBride at Yale and named "Freshman Organic Chemistry", 125A, which is on Itunes University. Only the lectures are ...
40 views

### Transparent material used in the movie Metropolis

This is probably a rather unusual question for this forum. The review of the movie Metropolis (made in 1926) by Roger Ebert shows what I assume is a still frame from the movie: The shield looks very ...
31 views

### What is the mechanism when 1-chloro-4-nitrobenzene reacts with NaOH?

The reaction mechanism in my textbook when 1-chloro-4-nitrobenzene reacts with NaOH is given as follows, When chlorobenzene reacts with NaOH the product formed is phenol with benzyne as the reaction ...
36 views

### Current density from overpotential

A current of $190$ mA is measure for a $2.5$ cm$^2$ electrode in contact with a solution containing M$^{2+}$/M$^{3+}$ metal ions at room temperature at a overpotential of +$180$mV. The transfer ...
114 views

### Hypothetical Quantum Chemical code without bothering with complex numbers

I have never understood why it is required to define the wave function as a complex function. Why bothering with all of these i, with Hermitian algebra and with adjunct operators? What would it change ...
25 views

### Calculating the concentration of reactants and products in parallel reactions after a time t

A substance A reacts with a solvent B to form an intermediate product IP. The reaction is bimolecular. The conc. of the solvent is constant at $12$M. IP can then react to form the two products P$1$ ...
29 views

### Units of collisional cross-section and reactive cross-section

I haven't been able to find the units of the reactive cross-section (σ* = Pσ) online but when I do a unit analysis from the equation: $$k = PσN_A √(\frac{8k_BT}{πμ}) e^{-E_a/RT}$$ then when plotting ...
32 views

### How to convert benzyl alcohol to 2-phenylethanoic acid?

How can we convert benzyl alcohol to 2-phenylethanoic acid? This is what I have tried. Can someone tell me whether this is correct because I am not sure about the second reaction. In my textbook it ...
46 views

### stoichiometric crystal

I wonder if there is something like a "stoichiometric crystal"? In other words: Is it possible to have a crystal that is non-stoichiometric? I'm not interested in crystal defects but don't ...
52 views

75 views

### Why is "Carbon can form many compounds with long carbon chains" not correctly explained by "Carbon atoms can share electrons with one another"?

Why is "Carbon can form many compounds with long carbon chains" not correctly explained by "Carbon atoms can share electrons with one another"? I am a high school student just ...
35 views

### Copper (I) nitride formula

Why is Copper (I) nitride's formula Cu3N? My periodic table says that nitrogen has a -2 state too, so couldn't it be Cu2N instead?
19 views

### Mechanism of Action of Carbachol

Carbachol (carbamylcholine chloride) is known to be a cholinergic agent. Does it work as an indirect agonist by inhibiting acetylcholinesterase, as a direct agonist of acetylcholine receptors, or is ...
27 views

### E Z configurations of alkenes where one of the substituents is same (a ring) [duplicate]

[I dont understand how we assign priority to the c=c group which has both of its valencies satisfied with the same substituent. Should I open the ring? Even then wouldn't it be the same?]
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### confusion regarding meta-cresol and phenol

when I googled the answer, i found out that m-cresol has a PKa value of 10.1 whereas phenol has 10.0. I am simply unable to use any logic to compare their strengths. We have been taught only the ...
21 views

### Does o-chloro phenol exhibit intermolecular hydrogen bonding along with intramolecular hydrogen bonding? [closed]

Though intramolecular hydrogen bonding exist in the above compound but will it also exhibit intermolecular bonding to any extent?
10 views

### Quantifying Residual Chlorine content in ppm in a Hydrocarbon

I have a process troubleshooting application where we need to quantify the amount of residual chlorine content in a liquid Hydrocarbon sample since this chlorine is a poison for the downstream ...
77 views

### What gives natural rubber a permanent shiny finishing?

Natural rubber is made by vulcanizing latex mixed with sulphur. Commonly, the resulting natural rubber is dull instead of shiny. However, there are also products made out of natural rubber that are ...
37 views

### Cleaning used frying oil with salt water : what is the point of using salt?

In the process of making soap from used frying oil, I need to purify the oil. I filtered the cooking oil but I also want to remove the polar compounds that are formed during frying : free fatty acids, ...
21 views

### Databases for Enthalpy of Solution and Ionic Radii for Ionic Salts

I am looking to investigate the relation between experimental enthalpies of solution and theoretical enthalpies of solution calculated using theoretical equations for the lattice enthalpy and ...
100 views

### Why does/doesn't sodium carbide exist?

(Here, I quote a question from an Indonesian undergraduate Chemistry competition: "sodium carbide reacts with water to form ethyne gas." This is the problem that caused me to ask this ...
41 views

### Reaction Mechanism for a radical ring opening

I have a radical reaction which I got from an organic chemistry lecture and was drawing the possible mechanism for it. Fig 2. shows my thought process. The I is removed making a radical and ISnBu$_3$. ...
30 views

### Does ozone have polar bonds?

Does $\ce{O3}$ have polar or non-polar bonds? My teacher says that $\ce{O3}$ has non-polar bonds. But chem-libre texts and many other sources state that a non-polar bond has equal distribution of ...
22 views

### Reducing sugars and redox potential

I am wondering if reducing sugars are those that can act as reducing agents, and they act as such with Tollens and Fehling reaction, then what's the redox potential here? And is it a reversible ...
20 views

### Adsorption on solids - homogeneous/heterogeneous surface definition

How could we define homogeneous and heterogeneous surfaces (rigorously)? It is among my exam questions (but I could not find any definition in my textbook or on the internet). I would say the ...
23 views

### Natural preservatives of ink

Would pure compounds like thymol, carvacrol and cinnamaldehyde work as preservatives of fountain pen ink? I'm specifically interested in three properties - Prevention of growth (mostly fungal) in the ...