# All Questions

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19 views

### Dissolving Metal Reduction of 4-Octyne to (E)-4-Octene and What Else?

I was reading Solomon's Organic Chemistry and came across the Dissolving Metal Reduction of 4-Octyne to (E)-4-Octene. (The same as can be found this question) But the book states that the (E)-4-...
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### How to get the enthalpy of a reaction from the enthalpy of formations with Hess' law?

Let's consider a generic reaction: $$\sum_{i=0}^{i=I}n_{i}A_{i} \rightarrow \sum_{j=0}^{j=J}m_{j}B_{j}$$ where $n$ and $m$ are the stoichiometric coefficients, while $A$ and $B$ are reagents and ...
26 views

### Can sorbitol be used in place of sugar to produce ethanol? [on hold]

I was doing some reading on wine making, then I had an idea would it be possible to use sorbitol to make ethanol. From my reading, sorbitol is a sugar alcohol used as a sugar substitute. The only ...
53 views

### Intrahydrogen bonding [duplicate]

Is it okay to conclude that in 2-nitrophenol where intra hydogen bonding is experienced, two similar molecules are only held by the weak van der waal's forces and is the reason for it to have a ...
69 views

### Why could it be assumed that the standard enthalpy change is independent of temperature down to 25 °C?

For the reversible reaction of pyruvic acid to 2,2-dihydroxypropanoic acid, we calculated enthalpy using NMR and extrapolated from area (integration) and peaks etc. We then plotted $\ln K$ vs $1/T.$ ...
24 views

### How much more carbon dioxide does catalytic converters cause? [on hold]

A typical car has an engine control unit programmed to add more oxygen into the cylinder than is optimal for mechanical power efficiency, to enable combustion in the catalyzer. How much less carbon ...
36 views

### Can stimulated Raman processes be strong enough to drive out of equilibrium?

In the (spontaneous) Raman process, incident light $\hbar \omega_1$ scatters and transfers some energy $\hbar \omega$ to a vibrational excitation of molecule or solid. Typically this is a very rare ...
45 views

### Why is FeCl3 (not AlCl3) used in chlorination of benzene? [on hold]

The book I am reading and on the internet everywhere I see FeCl3 is used for chlorination of benzene, can we use AlCl3 instead of FeCl3 because I assume it is working as Lewis base as anhy. AlCl3 work ...
29 views

### Aluminium Oxide as Dehydrating agent [on hold]

During preparation of alkenes from alcohols, we generally heat it in the presence of Al2O3 but how does aluminium oxide help in the reaction?
98 views

### Can acid-base reactions occur in a non-aqueous medium?

To better illustrate my question, allow me to refer to the case of ammonium chloride, formed through a classic acid-base reaction. The reaction between ammonia and hydrogen chloride to give ammonium ...
23 views

### Rust Spots on brand new porcelain toilet [on hold]

I work for a commercial mechanical contractor and we have a quite a few toilets installed on a facebook building that now have many little rust spots inside the bowl. Seems like the crews doing the ...
14 views

### Lewis Structures and electron distribution with oxygen atom

I am a novice in chemistry. I don’t understand the way Lewis structure and how electrons are shared between elements. For instance As we know, Oxygen has six valence electrons that means it has ...
23 views

### Why are alkenes with more substituents more stable than those with fewer substituents? [closed]

The title is pretty self explanatory- I want to know, why do substituents make alkenes more stable?
11 views

### Iodized salts titration with heat as independent variable [on hold]

I am doing the titration of iodized salts through freeing iodine atoms with hydrochloride acid and then titration gets with triosulfate with starch as indicator. My independent variable is how heating ...
49 views

### Why must there be degeneracy in the orbitals to have a Jahn-Teller effect?

Why is it the case that for Jahn-Teller effects to occur in transition metals there must be degeneracy in either the $\mathrm{t_{2g}}$ or $\mathrm{e_g}$ orbitals?
27 views

### How is molefraction of a solution different in vapour state vs in solution vs vapour-liquid equilibrium?

I have this question we are given 'x' grams of benzene and 'y' grams of toulene, it is said that the vapour pressure of benzene is 75mmHG and that of toulene is 22mmHG and we are supposed to find mole ...
22 views

### What is the absolute configuration of carbon 5 in 5-bromo-2-methylhex-2-ene

I am trying to work out the absolute configuration around carbon atom 5 in 5-bromo-2-methylhex-2-ene. Could someone please let me know if my working is correct? Does the wedged bond from C4 to C5 ...
52 views

### Last step of proposed cubane synthesis

I was watching an online lecture on decarboxylation by soda lime and the first few examples were straight forward but after a while a felt that the questions couldn't simply have one effect and maybe ...
21 views

### Why The Vilsmeier–Haack reaction of 2-phenylindole give pink color precipitate? [closed]

Tell me in brief about TLC of the product and solvent system ???
21 views

### Water Vapor Membrane [on hold]

Is there a plastic membrane that would allow water vapour to pass through, but not liquid water? Am looking into condensation harvesting in greenhouses to save water.
13 views

### Is there a method to calculate the concentration of a Sodium Sulphate solution from its electrical conductivity? [on hold]

I have a sodium sulphate solution which was made by reacting NaOH with CuSO4, I need to know its concentration to use it on a project, as soon as possible. I couldn't know for sure what was the mass ...
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### Can an electron of a atom of restricted to 2nd shell be excited to third shell? [on hold]

If there is an electron in the 2nd shell in the s subshell, can it get excited to the 3rd shell or is it only limited to the p subshell? Like hydrogen has only the 1st shell but I've seen many ...
7 views

### (API) Assay & (API) Content Uniformity on tablets weight in pharmaceutical processes

From what know, Both assay and content uniformity are directly proportional to tablet weight. I want to know what’s the difference in these two different forms of API testing in tablets. I only know ...
24 views

### Enol percentage comparison between 1,3 diketones and 1,2 cyclopentadione [closed]

To what extent does 1,2-cyclopentadione exist in enol form? Will it be more than for 1,3 diketones? 1,3-Diketone with active methylene groups can form hydrogen bonds with a 6-membered ring structure. ...
46 views

### Why does copper have a high enthalpy of atomisation when it has a fully filled d sub shell? [on hold]

If I understood correct, the high energy of atomisation for d-block element comes from the ability to make many metallic bonds due to half electron filled d-orbitals, but it seems here that copper has ...
884 views

### How is taste of chemical compounds determined?

How do we know the taste of compounds, and their smell too, when some of them are poisonous. My textbook had that Lead is sweet in taste, but it's poisonous. So, how exactly do we determine their ...
40 views

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### Help with Alkyne Reactions for OCHEM [closed]

I am not too sure on how to solve these, I have a midterm coming up kinda soon and I need help reviewing these problems because my professor isn't handing out answer keys!
19 views

### Difference between Ziegler–Natta method and Phillips method [closed]

I have to compare the similarities and differences between the Zieglerr–Natta method and Phillips method of producing polyethylene. However, the only difference I can find is the difference in ...
23 views

### How does the phase inversion temperature of an emulsion depend on the oil - water ratio?

How does the phase inversion temperature (PIT) at the fish tail point in the fish-like diagrams of an oil - water - surfactant emulsion depend on the oil - water ratio? The HLD (hydrophilic-...