# All Questions

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### Can nanotechnology reverse the effects of moldy food?

I was reading an article from Wired’s Artifacts from the Future; where a hypothetical future cooking station has a feature called “Nanobot De-molder” which I assume takes moldy food and then gets rid ...
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### Mass concentration question with calculations [on hold]

20cm3 of hydrogen peroxide solution of unknown concentration reacts with 12.15cm3 0.04 mol/dm3 of potassium permanganate solution in sulfuric acid media. Calculate the mass concentration of hydrogen ...
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### Is paraformaldehyde safe as a catalyst in cosmetics?

I am making a new body wax to sell. I have a supplier that is selling a very interesting ingredient but I happen to know it contains paraformaldehyde. They claim there is no formaldehyde left in the ...
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### Why does the viscosity of honey decrease when mixed with other viscous fluids?

In order to make honey mustard, I mix honey and mustard. But the resulting mixture is less viscous then both honey and mustard. How does mixing two viscous substances give a less viscous one?
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### How to control nucleation of NaCl crystals?

In addition to a previous question I posted, I have a second question. The previous question I shall link here: How to counter crust formation when crystallizing NaCl on the liquid-air interface? ...
22 views

### Is enthalpy of combustion the 'heat released' or 'enthalpy change'?

In a constant volume calorimeter, $\pu{3.5 g}$ of a gas with molar weight $\pu{28 g}$ was burnt in excess $\ce{O2}$ at $\pu{298 K}.$ Temperature of calorimeter increased from $298$ to $\pu{298.45 K}$ ...
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### Calculating the enthalpy and entropy [on hold]

I would like to know the answer and comment of this question Caculate the enthalpy and entropy changes of1mol Diopside as it is heated at 1atm from 600k to 1000K. Standard state of 298.15K and 0....
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### Movement and Position of Electrons in Atoms and Compounds with respect to various models

This may sound vague, but here goes. I've often wondered how electrons revolve in compounds (and not just atoms). That was before I came across various theories / models of the atom and I found out ...
21 views

### What gas would be suited best to form a density gradient in a long tube?

I want to set up an aero-optics experiment using a sealed ~5 m length of pipe with a gas inside. The gas must form a density gradient, and must be transparent enough to view a target at the other end ...
18 views

### Which has more lattice energy calcium oxide or calcium carbonate?

Which has more lattice energy calcium oxide or calcium carbonate? Calcium carbonate can get polarized. Does this have anything with lattice energy value compared to calcium oxide?
23 views

### Can I use the quasi-equilibrium approximation when drug and ligand distribution volumes are different?

A drug $D$ binds a ligand $L$ to form a complex $C$ according to the law of mass action. Furthermore, mass balance should be achieved. Can I still assume quasi-equilibrium when the distribution ...
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### Why highly electropositive elements form strong bases? [on hold]

I know that elements like sodium form hydroxides which completely dissociate in water but why do they dissociate more than others like magnesium hydroxide? Does reactivity has a role here ?how?
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### Electrophilic base / nucleophilic acid / basic electrophile / acidic nucleophile [on hold]

What I was understanding is that all bases are nucleophiles and acids are electrophiles means the condition for them is same and all nucleophiles are basic and all bases are nucleophiles and same for ...
15 views

### General way to identify number of node of an arbitrary wave function [on hold]

Assume an arbitrary wave function, how we can identify number of its node?
5 views

### Where can I find flux formulation for different solder composition? [on hold]

I am looking to make my own soldering flux and want to understand where do I get started?
133 views

### Spectra from Dipole Moments [on hold]

If there is a change in dipole moments such as absorption spectroscopy, there are infrared absorptions (and/or transmittance) corresponding to them. Is the reason change in dipole moments are in ...
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### What trend exists in the enthalpy change of reaction of group 2 carbonates with HCl

I am currently investigating the trends in enthalpy change of the reaction of group 2 carbonates with HCl. As per ion polarization theory there should be an upward trend in stability and thus a ...
34 views

### Confusion with IUPAC naming of Morphine

I'm having trouble understand what sections of the molecule morphine relate to what sections of its corresponding IUPAC name of (4R,4aR,7S,7aR,12bS)-3-methyl-2,4,4a,7,7a,13-hexahydro-1H-4,12-...
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### Does any body know which organic solvent can solute LiOH? [on hold]

Does any body know which organic solvent can solute LiOH? Very very very thanks for your answer ><
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### Hydrochloric Acid Melting Point [on hold]

Is there a specific reason why hydrochloric acid has a negative melting point of -114.2 degrees Celcius?
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### Derive # of atoms of a certain element in a compound given compound weight [on hold]

The answer is listed as (a) on the answer key. This is likely 99% accurate but there is a very small chance (a) is not correct.
51 views

### Why is the carboxyl proton in salicylic acid more acidic than the phenol proton?

I know I'm just wrong about this but I'd appreciate some help seeing why. It seems to me like the phenol proton in salicylic acid should be more acidic than the carboxyl proton. When I try to draw ...
24 views

### Major Organic Product of pheylpropene and diazomethane? [on hold]

What is the major organic product synthesized from phenylpropene and diazomethane? I get that N2 from the diazomethane is going to be the leaving group correct and it forms the carbene :CH2 correct? ...
19 views

### Melting Points Because of Electronegitivity [on hold]

Why is sodium iodides melting point lower than calcium chloride?
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### Diels-Alder - aromatic compound - mechanism [on hold]

I am trying to figure out a mechanism for the following reaction but I am sort of lost and I can't find anything that would help me... All the reactions I found are "pretty easy" to solve... Thanks ...
23 views

### Calibration curves and dilution factors

I am currently taking a course where we are exploring nitrate concentrations in water samples. We are using a UV-Vis Spectrophotometer and have created a calibration curve in the first part of the ...
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### Is there an economical way to neutralize sodium in compost? [on hold]

I have compost that has too much sodium. It has a CEC of over 50 due to high organic matter, so washing the sodium out takes a lot of water. (About 3 times the volume of soil.) Currently there are ...
30 views

### Non-Metallic properties shown by some metals [on hold]

I want to ask why Li, Be and Mg which are metals show Non-Metallic properties. I know they have small atomic size and high electronegativity as compared to other metals, but I don't know the reason ...
26 views

### Cross-conjugation

Could somebody please explain the concept of “cross-conjugation” (Organic Chemistry) to me? In what kind of conjugated systems is it observed, what are its effects on resonance of the system as a ...