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(_E_)-stilbene may be separated by crystallization from (_Z_)-stilbene and the side product of the Wittig reaction, triphenylphospine oxide ([TPPO][1]), by using absolute ethanol. My question is why? (_E_)-stilbene and (_Z_)-stilbene are isomers of each other, why (and how) do they differ in polarity? If both are of lo... |
In recent chemistry class , I learnt that like dissolves like I was told following points-
$1$$)$ Ionic solutes are highly soluble in polar solvents like water, ammonia etc.
Reason- The ion-dipole interactions between solvent molecules and solute's ions rip away the
electrostatic forces be... |
$$\ce{R-OH + NaBr + H2SO4 -> R-Br + NaHSO4 + H2O}$$
Due to sulphuric acid, the $\ce{-OH}$ group will get protonated and convert into $\ce{-H2O+}$ which is a great leaving group in comparison to the hydroxyl group. Therefore I assumed it would readily form a carbocation and then $\ce{Br-}$ could attack to form the al... |
In recent chemistry class , I learnt that like dissolves like I was told following points-
> 1. Ionic solutes are highly soluble in polar solvents like water, ammonia etc.
>
> **Reason:** The ion-dipole interactions between solvent molecules and solute's ions rip away the electrostatic forces between them and fur... |
One of the most fundamental equations in chemical thermodynamics states: $$ \Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵ $$
If we look at this equation in context of net chemical reaction in electrolytic or galvanic cell, it is usually interpreted as follows: Enthalpy of reaction denotes total amount of energy at c... |
Entropy Changes in Electrolytic/Galvanic Cell? |
### Problem
> It is believed that non-stoichiometric compound $\ce{F_{0.93}O}$ forms by doping of $\ce{Fe^3+}$ ions in $\ce{FeO}$ crystal by replacement of $\ce{Fe^2+}$. Calculate the number of cationic vacancies if all of the $\ce{Fe^2+}$ ions are replaced by $\ce{Si^4+}$ ions in $\pu{0.1 mol}$ of $\ce{Fe_{0.93}O}$... |
I was aware of the reaction of alkyl halides with Aqueos Sodium Nitrite but I came across the following reaction and was confused of how that would work?
$\ce{R-X + NaNO2 ->[DMF] R-NO2}$
DMF being the solvent here, I'm pretty sure it's safe to assume it will be following SN2 path here but since I have neve... |
How does the reaction of Alkyl Halides with sodium nitrite proceed? |
In my textbook, it is written that lowering of vapour pressure is not a colligative property but relative lowering of vapour pressure is a colligative property. But why is that? There is literally no explanation given in my textbook as to why this is true. Please someone explain. I am so confused. Please help. |
Why lowering of vapour pressure is not a colligative property? |
One of the most fundamental equations in chemical thermodynamics states: $$ \Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵ $$
If we look at this equation in context of net chemical reaction in electrolytic or galvanic cell, it is usually interpreted as follows: Enthalpy of reaction denotes total amount of energy at c... |
I was aware of the reaction of alkyl halides with Aqueos Sodium Nitrite which results in the formation of an alkyl nitrite but I came across the following reaction and was confused of how that would work?
$\ce{R-X + NaNO2 ->[DMF] R-NO2}$
DMF being the solvent here, I'm pretty sure it's safe to assume it wi... |
Specifically, for the primary carbon atom in the alcohol. Here is bond dissociation energy (BDE) data from chapter three of Luo's *Comprehensive handbook of chemical bond energies* \[1\] (**boldface** refers to dissociated atom):
$$
\begin{array}{llc}
\hline
\text{Compound} & \text{The broken bonds} & \mathrm{BDE... |
From all we know only tautomers should get the same InChi key, or, in case of the second block, if there are lots of stereo centers. However these cases are just collisions, they still have different InChi. I have found a class of molecule pairs, with four real-world examples in ChEBI and PubChem, where both web input ... |
From all we know only tautomers should get the same InChi key, or, in case of the second block, if there are lots of stereo centers. However these cases are just collisions, they still have different InChi. I have found a class of molecule pairs, with four real-world examples in ChEBI and PubChem, where both web input ... |
Can cis-trans isomers have same InChi? |
### Problem
> It is believed that non-stoichiometric compound $\ce{F_{0.93}O}$ forms by doping of $\ce{Fe^3+}$ ions in $\ce{FeO}$ crystal by replacement of $\ce{Fe^2+}$. Calculate the number of cationic vacancies if all of the $\ce{Fe^2+}$ ions are replaced by $\ce{Si^4+}$ ions in $\pu{0.1 mol}$ of $\ce{Fe_{0.93}O}$... |
I have been taught in class that
> DIBAL-H is more reactive towards esters than carboxylic acids while opposite is true for diborane.
Also DIBAL-H mentioned is taken under low temperatures (-78°C).
I was given no reason for the difference in preference.
Now I would suppose that ester would be slightly more ... |
I have been taught in class that
> DIBAL-H is more reactive towards esters than carboxylic acids while opposite is true for diborane.
Also DIBAL-H mentioned is taken under low temperatures (−78 °C).
I was given no reason for the difference in preference.
Now I would suppose that ester would be slightly more... |
I regularly home-distil small amounts of potable alcohol (ethanol), mainly from fermented sugar(s) solutions (the 'wash').
My still is a box standard, $4.5\mathrm{L}$ electrically heated (safety!), air-cooled pot still, which produces exactly $1$ single stage distillation ('one Theoretical Plate') Starting from a wa... |
If 100ml of 1M acetic acid and 20ml 0.01M NaOH is taken in a reaction medium,they will neutralize each other. I don't know for sure if this reaction is completely neutralized or not just took as an example. Now the water molecules produced in this reaction would increase slight amount of volume though they were present... |
I recently came across a scheme for the synthesis of panacene: https://pubs.acs.org/doi/10.1021/ol801921d
In this synthesis, there is a step in which a TMS group directly bonded to an aryl ring is removed with $\ce{TBAF}$ and $\ce{CsF}$ in $\ce{DMF}$.
I understand that silicon has a strong affinity for Fluoride... |
I would like to get the neutral salt solution for a weak acid whose pKa is 3.42. I am thinking to titrate the acid with NaOH (1M). But I found that 2.0998 ml of NaOH will give me around pH 7.4 (which is what I want as it is to be used in a biological system). The problem is it is very difficult to accurately adding 0.0... |
I recently came across a scheme for the synthesis of panacene (Sabot _et al._, [2008OrgLett4629](https://pubs.acs.org/doi/10.1021/ol801921d)):
[![enter image description here][1]][1]
In this synthesis, there is a step in which a TMS group directly bonded to an aryl ring is removed with $\ce{TBAF}$ and $\ce{CsF}$... |
I have an aquaeous solution of potassium bicarbonate and potassium sulfate. I want to find out the proportions of both compounds in the solution. What would be an efficient procedure?
Note that I do not have an analytical balance or other fancy equipment. I can do simple procedures like titrations. |
How can I determine the amounts of potassium bicarbonate and potassium sulfate in a solution? |
I recently came across a scheme for the synthesis of panacene (Sabot _et al._, [2008OrgLett4629](https://pubs.acs.org/doi/10.1021/ol801921d)):
[![enter image description here][1]][1]
In this synthesis, the step from 14 to 9 in removes a trimethylsilyl ($\ce{TMS}$) group directly bonded to an aryl ring with $\ce... |
«Not very much», as stated by `@Nisarg Bhavasar`'s comment below the OP's question intrigued me to provide an estimate about how much, or better, how little the relative amount of «new water», obtained by the neutralization is. The estimation assumes the absence of [water's autoprotolysis][1], and indeed, the amount i... |
The usual units are J/K, however
the only reason temperature has different units than energy is because we didn't used to know temperature was just the average kinetic energy of atoms/molecules. Hence, using a more reasonable system, the units would be J/J which just cancel.
I get that we're stuck with having di... |
Why isn't entropy dimensionless? |
> [OP] One of the most fundamental equations in chemical thermodynamics states: $$ \Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵ $$
This is just the definition of the Gibbs energy. By itself, it does not give you any insight into chemical reactions.
> [OP] If we look at this equation in context of net chemical ... |
In my textbook, it is written that lowering of vapour pressure is not a colligative property but relative lowering of vapour pressure is a colligative property. But why is that? There is literally no explanation given in my textbook as to why this is true. Please someone explain. I am so confused. Please help.
(By low... |
I have an aquaeous solution of potassium bicarbonate and potassium sulfate. I want to find out the proportions of both compounds in the solution. What would be an efficient procedure?
Note that I do not have an analytical balance or other fancy equipment. I can do simple procedures like titrations.
One idea I had... |
In my textbook, it is written that the expression for depression in freezing point is
$ΔT_{f}=K_{f}m$
But how did this expression come? There is literally no derivation given in my textbook. Can someone please rigorously prove this expression? I am so confused. Please help. (There is also a graph given in my te... |
What is the derivation for the expression of depression in freezing point? |
My teacher gave the following diagram in the class notes. He said that when a solution containing a non-volative solute (for e.g. a solution of $\ce{NaCl}$ in water) is freezed, then there will be some depression in freezing point and some part of the solution will freeze and some part won't freeze due to the presence... |
Why does the non-volatile solute go into the liquid part of the the solution when a solution containing non-volative solute is freezed? |
Recently I came across a problem involving Lucas reagent. It asks what is the major product when 2-methylbutanol is treated by HCl in presence of anhydrous ZnCl2? The answer says major product is 2-chloro-2-methylbutane. The reason it gives is 1,2 hydride shift. But my question is whether Sn1 reaction will even occur? ... |
I'm trying to write a detective-fiction novel, and I was wondering if Potassium Cyanide reacts with sugar only if the glucose for the amygdalin to form is dissolved in liquid or does it react even if the glucose is still sugar, like sugar cubes?
Like example: Potassium Cyanide was mixed in a sugar canister. Will the... |
I will keep it brief; if I generalize what an assignment is telling me, then a metal complex with 2 (iso)thiocyanate ligands would be named "bis(isothiocyanate)...metal(oxidation state) or bis(thiocyanate)...metal(oxidation state). From what I can tell [(1)](http://www.chemspider.com/Chemical-Structure.147265.html) [(2... |
Aren't isothiocyanate and thiocyanate ligands monodentate? |
[![sulfur tetrafluoride and thionyl tetrafluoride][1]][1]
I'm comparing sulfur tetrafluoride and thionyl tetrafluoride. The lone pair has more s character compared to a double bond. Therefore, sulfur in $\ce{SF4}$ should have a greater s character compared to sulfur in $\ce{SOF4}$.
Since $\ce{SF4}$ has a greater ... |
I read that group-16 monohalides exist in dimeric forms ex. $\ce{S2Cl2,Se2Cl2,Se2Br2}$ etc. <br>
It also states that these dimeric halides undergo disproportionation reactions and gives an example as follows: $\ce{2Se2Cl2 -> SeCl4 + 3Se}$
Now I thought what would be the disproportion reaction if we consider the ca... |
Can anybody share the symmetry labels for acetonitrile ($\ce{CH3CN}$), please?
I mean to assign the symmetry labels to orbitals of acetonitrile |
The osmotic pressure of an aqueous solution at $25$ Celsius is $92.0$ $kPa$. Calculate the boiling point
of the solution. (Assume that the density of the solution is $1.04$ $g/mL$, ignore the mass of the
solute)
Before starting the problem, are there any formulas related to the boiling point so that the task could... |
The osmotic pressure of an aqueous solution at $25$ Celsius is $92.0$ $kPa$. Calculate the boiling point
of the solution. (Assume that the density of the solution is $1.0$ $g/mL$, ignore the mass of the
solute)
Using the formula $\pi = cRT = \rho g h$, we can find the concentration value and height; however, how o... |
I am given that the enzyme concentration is $15$nM and the following data:
$$\begin{array}{c|c}
S/\pu{mM} & V/\pu{mM s^{-1}} \\ \hline
1\ & 0.202\\
2 & 0.368\\
5\ & 0.729\\
10\ & 1.08 \\
20\ & 1.43\\
50\ & 1.77\\
100\ & 1.92 \\
\hline
\end{array}$$
And calculated that the Michaelis-Menten constant ... |
Recently started on NMR spectrum, and I'm slightly confused about chemical shifts and their connection to the resonance frequency and magnetic field.
From what I know, the "new" way of doing NMR means keeping the radio-frequency constant and increasing the external magnetic field in small increments.
Now, I bel... |
> [OP] One of the most fundamental equations in chemical thermodynamics states: $$ \Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵ $$
This is just the definition of the Gibbs energy. By itself, it does not give you any insight into chemical reactions.
> [OP] If we look at this equation in context of net chemical ... |
It looks like you are describing continuous wave (CW) and not pulsed NMR. The latter is generally considered a more modern way of doing NMR as it was developed after the CW technique. The pulsed technique was also accompanied by the development of FT processing which resulted in a Nobel price being awarded to Richard E... |
I answered wrong on my quiz the following question on finding an equilibrium constant:
>For the following reaction, at $1~\mathrm{bar}$ and $300~\mathrm{K}$, partial pressures of $\ce{NO2}$ and $\ce{N2O4}$ are both $0.5~\mathrm{bar}$. If pressure is increased to $2~\mathrm{bar}$ (this is the final pressure), and tem... |
I am given that the enzyme concentration is $\pu{15 nM}$ and the following data:
$$
\begin{array}{rl}
\hline
S/\pu{mM} & V/\pu{mM s^{-1}} \\
\hline
1 & 0.202 \\
2 & 0.368 \\
5 & 0.729 \\
10 & 1.08 \\
20 & 1.43 \\
50 & 1.77 \\
100 & 1.92 \\
\hline
\end{array}
$$
And calculated that the Michaelis... |
Does anyone have a clue how I could find the bulk Debye-Waller factor of SnO2?
I have been doing some online digging with no luck.
If anyone has a reference I could use that would be awesome.
Thanks |
> [OP] One of the most fundamental equations in chemical thermodynamics states: $$ \Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵ $$
This is just the definition of the Gibbs energy. By itself, it does not give you any insight into chemical reactions.
> [OP] If we look at this equation in context of net chemical ... |
I read that group-16 monohalides exist in dimeric forms ex. $\ce{S2Cl2,Se2Cl2,Se2Br2}$ etc. <br>
It also states that these dimeric halides undergo disproportionation reactions and gives an example as follows: $\ce{2Se2Cl2 -> SeCl4 + 3Se}$
Now I thought what would be the disproportion reaction if we consider the ca... |
> [OP] One of the most fundamental equations in chemical thermodynamics states: $$ \Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵ $$
This is just the definition of the Gibbs energy. By itself, it does not give you any insight into chemical reactions.
> [OP] If we look at this equation in context of net chemical ... |
> [OP] One of the most fundamental equations in chemical thermodynamics states: $$ \Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵ $$
This is just the definition of the Gibbs energy. By itself, it does not give you any insight into chemical reactions.
> [OP] If we look at this equation in context of net chemical ... |
I'm trying to write a detective-fiction novel, and I was wondering if potassium cyanide reacts with sugar only if the glucose for the amygdalin to form is dissolved in liquid or does it react even if the glucose is still sugar, like sugar cubes?
For example if potassium cyanide was mixed in a sugar canister. Will th... |
In *Cambridge Chemistry Coursebook* \[1, p. 94\] it’s written that
> A rise in temperature is given a positive sign. So the value of $\Delta H$ is negative for an exothermic reaction. A fall in temperature is given a negative sign. So the value of $\Delta H$ is positive for an endothermic reaction.
Why is the sig... |
From all we know only tautomers should get the same InChi key, or, in case of the second block, if there are lots of stereo centers. However these cases are just collisions, they still have different InChi. I have found a class of molecule pairs, with four real-world examples in ChEBI and PubChem, where both web input ... |
From all we know only tautomers should get the same InChi key, or, in case of the second block, if there are lots of stereo centers. However these cases are just collisions, they still have different InChi. I have found a class of molecule pairs, with four real-world examples in ChEBI and PubChem, where both web input ... |
$$\ce{2NOCl <=> 2NO + Cl2}$$
What will be the effect on equilibrium concentration of $\ce{NOCl}$ when equal moles of $\ce{NOCl}$ and $\ce{NO}$ are introduced in the mixture at constant temperature?
**Now this is what I think**
Increasing the moles will result in increased concentration of both $\ce{NOCl}$ and... |
From all we know only tautomers should get the same InChi key, or, in case of the second block, if there are lots of stereo centers. However these cases are just collisions, they still have different InChi. I have found a class of molecule pairs, with four real-world examples in ChEBI and PubChem, where both web input ... |
In halogenation reaction of benzene , $\ce{AlCl_3}$ is used as a catalyst in order to form electrophile $\ce{E^+}$.
So I was wondering that $\ce{AlCl_3}$ is a lewis acid( that fact being also used in mechanism ) and so an Electrophile, So why it can't just do electrophilic substitution reaction on the benzene itself... |
Why can't Aluminium chloride do Electrophilic substitution as an electrophile? |
(_E_)-stilbene may be separated by crystallization from (_Z_)-stilbene and the side product of the Wittig reaction, triphenylphospine oxide ([TPPO][1]), by using absolute ethanol. My question is why? (_E_)-stilbene and (_Z_)-stilbene are isomers of each other, why (and how) do they differ in polarity? If both are of lo... |
Is it possible to work out the x-coordinates related to high symmetry points?
The software I'm using doesn't provide me with that, so I was wondering if there is a way to manually figure it out, as I would like to add high symmetry point labels to an electronic band structure plot. |
I am a little stuck understanding the difference between Gibbs free energy and enthalpy. Both are measured in Joules and hence some sort of energy.
In a chemical reaction where C --> A + B
If A and B are more stable, this means energy will be released. This ΔPE is enthalpy(ΔH), correct? Enthalpy can be calculated... |
Is it possible to work out the x-coordinates related to high symmetry points?
The software I'm using doesn't provide me with that, so I was wondering if there is a way to manually figure it out, as I would like to add high symmetry point labels to an electronic band structure plot.
I found a similar question: https... |
In halogenation reaction of benzene, $\ce{AlCl3}$ is used as a catalyst in order to form electrophile $\ce{E^+}$.
So I was wondering that $\ce{AlCl3}$ is a Lewis acid (that fact being also used in mechanism) and so an electrophile. Why it can't just do electrophilic substitution reaction on the benzene itself? Isn't... |
Can't aluminium chloride do electrophilic substitution as an electrophile? |
In the structure of $\ce{H2SO3}$
[![H2SO3 pic][1]][1]
there is a lone pair on sulfur.
Why can't sulfur make a bond with one of the hydrogen atoms and a double bond with oxygen to avoid having a lone pair?
Such as given below:
[![enter image description here][2]][2]
Because here there will be sp3 hybr... |
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/SnnRf.png
comparing the cahn-ingold prelog priority of the above groups, I should first compare the atoms attached to the first carbon.
So we get:
(A): {O,C,H}
(B): {O,C,H}
(C): {O,C,H}
(D): {O,C,H}
therefore we have to c... |
I would like to get a neutral salt solution for a weak acid whose pKa is 3.42. This weak acid is in the form of solution (now is 20% w/w), thus I cannot directly dissolve the powder into the buffer etc. And I would like the resulting solution to be as concentrated as possible.
I am thinking to titrate the acid with ... |
I would like to get a neutral salt solution for a weak acid whose pKa is 3.42. This weak acid is in the form of solution (now is 20% w/w), thus I cannot directly dissolve the powder into the buffer etc. And I would like the resulting solution to be as concentrated as possible.
I am thinking to titrate the acid with ... |
Here, ΔH = Enthalpy change, ΔU = Change in internal energy, P = pressure and V = volume.
I know that ΔH(Enthalpy) is heat given/taken to/from system at constant pressure. But I have been practicing questions recently on this topic and came to this confusion.
Let me first put out the question I solved:
"One mol... |
What is the difference between ΔH = ΔU +Δ(PV) and ΔU = q + w? |
I may be missing something, but a rough reality check says that if you are thinking of adding 2.0998 mL of 1 N NaOH solution, you have ~0.0021 moles of base, which for a good buffer, should have about ~0.0021 moles of acid. If your acid solution is 20% by weight, and guessing 200 for a molecular weight, your total acid... |
Here, ΔH = Enthalpy change, ΔU = Change in internal energy, P = pressure and V = volume.
I know that ΔH(Enthalpy) is heat given/taken to/from system at constant pressure. But I have been practicing questions recently on this topic and came to this confusion.
Let me first put out the question I solved:
"One mol... |
i came across the following question :
[![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/D7XzL.jpg
my reasoning was as follows :
<br>1. it cant be option (c) because there is no chance of losing a carbon during Cannizzaro's reaction
<br>2. it cant be option (b) because basically ... |
look, all i can say is that $ D > C > A $
<br>
why ?
<br>
Lets compare A and C<br>
$ OCH$<sub>3</sub> and $ H $ are common to both. one has CH<sub>3</sub> and the other has CH<sub>2</sub>F. of course, C > A.
<br>
compare A and D in the same way and find that D > A
<br>
compare D and C now. <br>
there is clear... |
I came across the following question :
> [![enter image description here][1]][1]
>
>
> [1]: https://i.stack.imgur.com/D7XzL.jpg
My reasoning was as follows :
1. it cant be option (c) because there is no chance of losing a carbon during Cannizzaro's reaction
2. it cant be option (b) because basica... |
[CuNH3)4]+2 has sp²d hybridisation
A question might pop why not dsp² ?
So basically if it were sp²d then the paired electron which was promoted to 4p orbital , would be less bound to Nucleus and hence it would be easier to oxidise but in contrary [Cu(NH3)4]+3 doesn't exist . Hence finally huggin suggested that the ... |
Triatomic molecules are either linear or bent.If we analyse SO2 molecule, it turns out that it is **bent**.
I know $\pi$ bonds do not alter shape, but merely the bond lengths.
Now since one of the bond between S and O is p$\pi$-p$\pi$ bond and other bond is is d$\pi$-p$\pi$ bond ,
The two $\pi$ bonds are not... |
Why two bonds in $\ce{SO2}$ are same? |
I came across the following question :
> [![enter image description here][1]][1]
>
>
> [1]: https://i.stack.imgur.com/D7XzL.jpg
My reasoning was as follows :
1. it cant be option (c) because there is no chance of losing a carbon during Cannizzaro's reaction
2. it cant be option (b) because basica... |
I came across the following question :
> [![enter image description here][1]][1]
>
>
> [1]: https://i.stack.imgur.com/D7XzL.jpg
My reasoning was as follows :
1. It can't be option (c) because there is no chance of losing a carbon during Cannizzaro's reaction
2. It can't be option (b) because basi... |
Why two bonds in SO2 are same? |
Triatomic molecules are either linear or bent. If we analyse the $\ce{SO2}$ molecule, it turns out that it is **bent**.
I know that $\pi$ bonds do not alter shape, but merely the bond lengths.
Now since one of the bonds between S and O is a p$\pi$-p$\pi$ bond and the other bond is a d$\pi$-p$\pi$ bond, the two ... |
Why are the two bonds in SO2 identical? |
Here, ΔH = Enthalpy change, ΔU = Change in internal energy, P = pressure and V = volume.
I know that ΔH(Enthalpy) is heat given/taken to/from system at constant pressure. But I have been practicing questions recently on this topic and came to this confusion.
Let me first put out the question I solved:
"One mol... |
The problematic "symptom" that I try to fix, is the static friction of two sliding plastic parts.
This is about a keyboard key switch that was made during the 80s.
When the slider is pressed under a small angle, it gets strong binding issues (i.e. it is stuck and needs a lot more force to move it) and it als... |
$\ce{[Cu(NH3)4]^2+}$ has $\mathrm{sp^2d}$ hybridisation.<br>
A question might pop why not $\mathrm{dsp^2}$? <br>
So basically if it were $\mathrm{sp^2d}$ then the paired electron which was promoted to $\mathrm{4p}$ orbital, would be less bound to nucleus and hence it would be easier to oxidise, but in contrary, $\ce... |
*UPDATE:*
The problematic "symptom" that **I try to fix, is the static friction** of two sliding plastic parts.
This is about a keyboard key switch that was made during the 80s. The problem/issue is that after I applied **Grease #1**, then when the slider is pressed under a small angle, it gets strong binding iss... |
*UPDATE:*
The problematic "symptom" that **I try to fix, is the static friction** of two sliding plastic parts.
This is about a keyboard key switch that was made during the 80s. The problem/issue is that after I applied **Grease #1**, then when the slider is pressed under a small angle, it gets strong binding iss... |
How to find the change in internal energy (q+w) for an expanding monoatomc ideal gas? |
I'd like to count the total valence electron of following neutral complex in the ionic counting (=donor-pair):
![enter image description here][1]
[1]: https://i.stack.imgur.com/YIMMb.png
Electron count:
$$\begin{align} \ce{Cl-} : \ce{6e-} \\ \ce{CH3-}: \ce{2e-} \\ \ce{PPh3} : \ce{2e-} \end{align}$$
... |
Articles like this claim oxygen can evolve from layered metal oxide cathode materials when charging the Li-ion battery.
Is it the high positive potential given to the cathode while charging pulling the electrons from the chemical bonds of the cathode materials and thus cause the decomposition to evolve oxygen?
If not... |
What is the reason for decomposition of layered cathode materials? |
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