# All Questions

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### Density g/cm3 of bleached viscose

I can find in literature what the density is for untreated viscose, but not for viscose that is bleached. Does this change the density? And what is the density for bleached viscose?
20k views

### Activation energy and temperature [duplicate]

It is said that activation energy does not change with temperature. But I am unable to figure out why. If we increase the temperature, the kinetic energy of the molecules will increase and they will ...
147 views

### How to identify an emerald green solution with possibly two anions?

The solution is emerald green in colour. When added with water, it gives a pale blue solution. When reacted with $\ce{BaCl2}$, it gives a sky blue solution and a white precipitate. When reacted ...
3k views

### Do only outer electron shells take part in forming chemical bonds?

Do only outer electron shells take part in forming chemical bonds? Or could an inner shell create a bond under some conditions?
4k views

### Periodic cleavage of carbohydrates

Carbohydrate like glucose undergoes periodic cleavage by $\ce{HIO4}$ and forms respective products are five moles of formic acid and one mole of formaldehyde. Here is my question , what is mechanism ...
255 views

### How does an electrolyte react to voltages below its electrolysis potential?

An electrolyte can be electrolysed by a voltage higher than the reverse reaction’s cell potential, while conducting a current in the process. But what happens at the electrodes when the applied ...
134 views

### How to figure out which two solutions will emit largest heat when they are mixed in same volumes?

How can I figure out which two solutions will emit the largest heat, when they are mixed in same volumes? Then let's assume that there are five pairs of solutions given: \begin{align} \ce{2NaOH +...
431 views

### Does the Battery Bounce Test actually work?

I heard that a good way to test if a battery is dead or alive is to see if it bounces. Supposedly, dead batteries bounce higher than living ones. Can someone tell me if this is a legitimate claim, and ...
717 views

### Quantum mechanical explanation for Le Chatelier's principle?

We know from basic chemistry that a reaction reaches equilibrium as described by Le Châtelier's principle. What's the quantum mechanical explanation to this principle? How a change in temperature/...
64 views

### Can one dichlorotriazine molecule form two bonds with cellulose?

In all the reactions I saw online, dichlorotriazine is shown to form only one bond with cellulose (example 1, example 2; paper). But cellulose has many potential sites for bonding. Can ...
17k views

### Why is a ketone not capable of hydrogen bonding among themselves?

The ketone has one oxygen atom in it and there are two lone pairs hanging out, both of which make it seemingly capable of hydrogen bonding. But in reality it is not. Did some research and found this ...
5k views

### Equilibrium constant when adding more of a reactant

Suppose I have the reversible reaction: $$\ce{A +B⇌ C}$$ The reaction is at equilibrium with equilibrium constant $K$ I am told that if I increase the concentration of $\ce{B}$, the rate for the ...
287 views

### How do I write many cyclic voltammetry curves in Nova?

We are making an electrochemical research on supercapacitors that involves checking stability of our material. That requires repeated writing of cyclic voltammetry curves. Our goal is to write at ...
2k views

Is it possible to add copper nitrate solution and lead so that a single displacement reaction occurs to yield lead nitrate. I recently melted lead and added cooper nitrate to the molten lead. I then ...
137 views

### Software for technical calculation of chemical reactors

I'm not a chemical engineer and don't have good background in it. Just my father asked me to do something for him, as I'm a computer engineering graduate. This is a software for calculation of ...
122 views

### Interstitial sites: edge and face sharing?

In close packed structures there is one octahedral hole per close packed atom. In a HCP unit cell these octahedra form a chain of face sharing polyhedra. Is this this universal in close packing or ...
6k views

### How does chromium help stainless steel prevent rusting?

Various sources (such as this one) say that stainless steel is stainless because a passivation layer of an oxide is formed, but I haven't found details on why chromium helps create this passivation ...
368 views

I am working on a yeast fermentation project, and I am getting final OD660 reading of 1.85 for different media: yeast extracts+cane molasses, nitrogen source+cane molasses, and glucose+cane molasses ...
6k views

### Do all double displacement reactions lead to precipitates?

I know that most of the double displacement reactions form some kind of precipitates as their products. But do all of the double displacement reactions form precipitates? I have searched on this site ...
2k views

### Ring expansion from a given cyclic carbocation

How will the cyclobutane ring behave in the case of cyclobutylmethylium (cyclobutylmethyl cation)? I initially thought there would be ring expansion to a five membered ring so that there may be less ...
892 views

### Calculating pH of an unknown base, and the pKb

The percent dissociation of a base $\ce{X}$ in a $0.002\ \mathrm{M}$ solution is $4.7 \cdot 10^{-3}\ \%$. What is the pH of the solution and what is the $\mathrm{p}K_\text{b}$ of base $\ce{X}$? The ...
620 views

### If for a chemical reaction the standard gibbs free energy is negative then :

If the standard gibbs free energy for a reaction is negative then the forward reaction will take place and the reaction will not be reversible. Is it true ? I have a problem understanding what is ...
3k views

### Why carbon nanotubes can act as a good electrical conductor?

Bulk carbon is an insulator, but at nanoscale (e.g. carbon nanotubes) carbon may become a good electrical conductor. If I am correct this means carbon nanotube band structure is metal-like. E.g. it ...
72 views

### Dissolving to Create a Solution with Ethanol

If at 95% Ethanol can dissolve chemical X at 1mg/1mL then theoretically if you have 500mg of chemical X you can dissolve it in 500mL of $\ce{EtOH}$ to get 1mg/mL correct? My question is, if you have ...
207 views

### Determining spin of metal complex

Is there any way to determine the spin of $\ce{[Fe(OH)6]^{4-}}$ without looking at the spectrochemical series?
3k views

### When is phosphorus a polyatomic molecule?

Phosphorus is listed as a single element in the periodic table; however, I see that it is also a polyatomic molecule as $\ce{P4}$. I am trying to determine the number of atoms of phosphorus in an ...
184 views

### Wavelength extention in AAS

Theoreticly, the width of the spectral line in AAS (atomic absorbtion spectroscopy) is 10^-5, but in fact there happens an extention of it and it becomes 0.002-0.005. There are some factors which ...
2k views

### Purpose of ammine in Tollens' reagent

In this previous question the mechanism for the reaction of Tollens' reagent was outlined. As I understand it the oxidising agent in Tollens' is the diamminesilver(I) complex $\ce{[Ag(NH3)2]+}$ but ...
626 views

### Bromine with 10 electrons

On a test question, my organic chemistry professor gave us a really big molecule and told us to give list the formal charges on each atom. There was a $\ce{Br}$ with 3 lone pairs and a double bond to ...
280 views

### Dissolving Aspartic acid in vinegar?

I am trying to dissolve aspartic acid into vinegar as use as a carbon source in saltwater aquariums. It does not dissolve. I was told to increase the pH and it will work? What is the best way to ...
3k views

### Carbon with two double bonds and oxygen name

I have a compound like this: $$\ce{CH2=C=O}$$ I wonder if it is a functional group or a normal group. As a functional group I couldn't find out. Is it a normal compound or a functional group and ...
7k views

### Benzylic and allylic carbocation stability order [closed]

Most books I have read stop at this order : Benzylic > Allylic > Tertiary > secondary > primary However If I want to compare tertiary, secondary and primary benzylic and Allylic carbocations what ...
5k views

### Burning a diamond produces how much energy?

How much energy is produced by burning a 1 ct. diamond? I'm trying to figure out how much energy to build the diamonds in a biological process. See here: https://worldbuilding.stackexchange.com/...
155 views

2k views

### What is the mechanism of trialkylborane oxidation with hydroperoxide?

This is the mechanism of trialkylborane. In this mechanism I can't understand why should the -OH group leave and the -R group enter in its place to form borate ester. Can someone please explain me ...
Ethers on hydrolysis with dilute $\ce{H2SO4}$ under pressure produce alcohols. This is basically a type of acidic cleavage of ethers by the SN2 mechanism. (source) There is inversion of ...