# All Questions

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9 views

### If you placed silver metal into silver nitrate, would a reaction occur?

thinking about oxidation and reduction, what happens to the silver metal and the silver ions?
2 views

### Why chlorine ion is more stable than chlorine atom?

In heterolytic cleavage , For instance,NaCl breaks in two fragments Na+ and Cl-. If Chlorine is full filled because it takes one electron from sodium ,now chlorine is full filled then why further ...
12 views

### Check My Beginner's Guide to Shells, Energy Levels, Subshells, and Orbitals

I am a beginner trying to summarize what I've learned about: Shells Energy Levels Subshells and Orbitals all at the high school level. Unlike related threads, I'm going to try to: Define each word ...
5k views

### Why is Promethium the only radioactive Lanthanide?

Why is it that only Promethium (Pm) is the only radioactive lanthanide? I was trying to figure out what percentage of all radioactive elements in the Periodic Table the f-block accounts for, when it ...
12k views

### Preparation of picric acid

My textbook says "Nowadays picric acid is prepared by treating phenol first with concentrated sulfuric acid which converts it to phenol-2,4-disulfuric acid and then with concentrated nitric acid to ...
7 views

### Organic Chemistry, carbonyls

https://imgur.com/a/WmTInTa I'm a bit lost on how to do this, for Product C I can see two things happening: 1) The -OCH3 attacks the alpha hydrogen, but that doesn't really make sense as then you ...
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15 views

### H NMR splitting in pure sample

Why does a pure product create an H NMR spectrum without visible splitting (smooth peaks of various heights and widths) versus the same product with impurities present has a spectrum with clear ...
51 views

### Could coating silver inside of a cuvette be used for SERS?

I understand that molecules adsorbed to a coinage metal surface experience plasmonic enhanced Raman shifts and I have a spectrometer that I would like to perform SERS measurements with but do not have ...
17 views

### What does 3-(Trimethoxysilyl) propyl dimethyl octadecyl ammonium chloride do? [closed]

Someone recently made the claim to me that 3-(Trimethoxysilyl) propyl dimethyl octadecyl ammonium chloride was significantly more effective in dealing with the Corona Virus outbreak because it could "...
101 views

### SERS Gold nanoparticles performing poorly in organic solvents?

We have been working with some organic solvents lately and noticed a sharp decrease in surface-enhanced Raman spectroscopy (SERS) performance from our gold nanoparticles deposited in an organic ...
258 views

### Interaction between soy milk and coffee producing bubbles

I noticed when I poured my soy milk (which I shook as per the directions on the carton) into my coffee, a large number of very fine bubbles rose to the surface. What causes this? Is there a chemical ...
14 views

### Internal energy with microscopic kinetic or potential energy

For every process in an isolated system that has no macroscopic kinetic or potential energy, ∆E=0 Will this statement be true if instead of macroscopic it were microscopic?
14 views

### Do esters and amides hydrolyze in neutral medium

It is well known that esters and amides readily hydrolyze in acidic/ basic medium. I want to know if thay can undergo hydrolysis in neutral medium as well. In other words, does ph only affect rate of ...
38 views

### I am seeing Doublet of Doublets peaks when I should see just a doublet

The following is a tutorial question I need to do: I initially thought the answer was isobutyl formate (CAS:542-55-2) but what confuses me is the dd peak at $\pu{3.9-4.0 ppm}$. To my knowledge, ...
42 views

### Are Hansen solubility parameters available for inorganic salts or ionic molecules?

Are Hansen solubility parameters available for inorganic salts or ionic molecules (e.g. potassium oleate, potassium stearate, sodium dioctyl sulfosuccinate (AOT), sodium dodecyl benzol sulfonate (SDBS)...
14 views

### Generate Surface with CubeFile from Gaussian in VMD or other free programm

I asked a question before, about how to save a mapped surface from GaussView. I don't get an answer, so I get much deeper in my internet research about it again. Now I want to try to create a mapped ...
980 views

### Which is the strongest base relative to ammonia?

Among these bases, ammonia methylamine ethylamine dimethylamine trimethylamine quinuclidine 1) Which is the strongest base relative to ammonia? Why? 2) Which conjugate ...
3k views

### Ratio of copper(II) ions to EDTA?

What is the ratio of copper(II) ions to EDTA in a $\ce{[Cu(EDTA)]^{2-}}$ complex? I know that EDTA forms up to 6 coordinate bonds with the central atom, but is that what they are asking for with "...
110 views

### Difference in major product of sulphonation of phenols

When phenol is sulphonated by fuming sulfuric acid at a lower temperature, the ortho product is the major whereas at higher temperature the para product is formed as the major. Why does this happen, ...
65 views

### Finding the pH of a solution

What are the steps we go about in finding the pH of a solution of Strong base and a salt of a Weak base and Strong acid? Here is the question that I've been given Find the pH of a solution made ...
2k views

### Why is tin(II) fluoride more effective in turning apatite into fluorapatite?

In more powerful toothpastes, like Crest Pro-Health, stannous fluoride is used in place of sodium fluoride. According to Wikipedia: Stannous fluoride converts the calcium mineral apatite into ...
77 views

### Open resource for spectroscopic raw data

Is anyone aware of reliable resources (ideally public) which allow the user to download the raw spectroscopic data such as infrared spectrum of small organic molecules, or rotational spectrum of HCl/...
80k views

### Why is DNA negatively charged and what makes it so?

What part in the strand contributes to the overall non neutral charge? DNA is not isolated in the body, so what keeps it stable while being charged? Why is it important for DNA to be charged?
68 views

### What is really the number in the periodic table?

I learning basic chemistry and i have a doubt. I have this definitions Molar mass: Is the mass of $6.022\times10^{23}$ atoms of a chemical element and its unit of measurement is $\mathrm{g/mol}$. ...
84 views

### Trends in solubility of group 2 nitrates

In my lab report, we are required to explain the trends in solubility of group 2 salts, going down the group. I had explained all of the trends except one, group 2 nitrates. The following is the data ...
9 views

### I want to clarify a doubt regarding polymers [closed]

What is Glass transition temperature? Justify glass transition temperature of Polyvinyl Alcohol is greater than Polyethylene
24 views

### Conditions for Complete hydrolysis of salt [closed]

My text book says that the cations (or anions) which are stronger than hydronium ion(or OH-) and their conjugate base (or acid) being very much weaker than water show complete hydrolysis. While the ...
17 views

### Why is Beryllium intensely hydrated if its reduction potential is so low? [closed]

I just read these two facts and they don't match up. The reduction potential of Be is much less than rest in the group. This indicates that beryllium is much less electropositive than the others and ...
8 views

### radical calculation with gaussian [closed]

I have neutral molecule (e.g. C2H2O) at ground state and I want to calculate its total energy with DFT method. I use Gaussian program. I wanna ask how it is possible to calculate it appearance ...
Why is $d_{x²-y²}$ orbital used in $sp^3d$ (square pyramidal geometry) while $d_{z^2}$ orbital in $sp^3d$ (trigonal bipyramidal geometry)? I came across this information while reading J.D.Lee Concise ...