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Stable natural helium hydride? |
Why equivalents of reactants and products come out to be equal in a reaction? I am seeking logic behind the law of chemical equivalence and i have just asked it for clarifying the concept.
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Is carbon dioxide organic or inorganic? |
As a project I am trying to plate mercury onto a powdered metal amalgam of Cu & Ag. I am using solution of HgCl2 in normal HCl (a reducing agent), Any thoughts for increasing the efficiency of plating process on the metal alloy powder? How can we improve the Hg plating on the metal powder? Can the concept of autocataly... |
In molecular orbital theory bonding of two atoms can be seen as addition or substraction of the wave functions of these atoms. Addition seems pretty logical and straight-forward - atoms overlap their electron clouds and probability to find an electron in it increases. Substraction is the thing I don't get. How can te p... |
Substracting wave functions? |
As a project I am trying to plate mercury onto a powdered metal amalgam of $\ce{Cu}$ & $\ce{Ag}$. I am using solution of $\ce{HgCl2}$ in normal $\ce{HCl}$ (a reducing agent), Any thoughts for increasing the efficiency of plating process on the metal alloy powder? How can we improve the Hg plating on the metal powder? C... |
Some combinations of two elements have very complicated phase diagrams across the weight% horizontal axis. Others are rather simple. Is this a function of only one or both of the elements involved? I would think both. However, surely there are some elements that tend to form more phases than others. Has this tendency t... |
Which elements tend to form the most phases? |
Some combinations of two elements have very complicated binary phase diagrams across the weight% horizontal axis. Others are rather simple. Is this a function of only one or both of the elements involved? I would think both. However, surely there are some elements that tend to form more phases than others. Has this ten... |
Some combinations of two elements have very complicated binary phase diagrams across the weight% horizontal axis. Others are rather simple. Is this a function of only one or both of the elements involved? I would think both. However, surely there are some elements that tend to form more phases than others. Has this ten... |
Can atomic number change the type of electromagnetic radiation being emitted when a electron drop from a energy level to another? |
A homework question asks for physical properties of potassium nitrate, and specifically asks for magnetic charge and strength (that is how it is phrased). I have properties such as white in color, vitreous, odorless, and melting point of 334 degrees Celsius. It is relatively stable, and a strong oxidizer, so it acts as... |
A homework question asks for physical properties of potassium nitrate, and specifically asks for magnetic charge and strength (that is how it is phrased). I have properties such as white in color, vitreous, odorless, and melting point of 334 C. It is relatively stable, and a strong oxidizer, so it acts as a good fuel s... |
Chlorine can be $sp^3d^3$ hybridized.
If so, it can form $\ce{ClH_7}$ and chlorine, being more electronegative, will have (-7) as its oxidation number. But we know that the oxidation number of $\ce{Cl}$ lies between (-1) and (+7).
Thoughts? |
Is it possible to make a solution of pH 7 phosphate buffer solution using phosphoric acid and $\ce{K2HPO4}$ ? How can I calculate the amount of $\ce{K2HPO4}$ needed for 1L of phosphoric acid ? |
phosphate buffer from phosphoric acid and K2HPO4? |
Since temperature of water can be hot as well as cold but does it really affects its ability to fight with fire like is there any difference?
|
Does the temperature of water affects its ability to fight water? |
Chlorine can be $sp^3d^3$ hybridized.
If so, it can form $\ce{ClH_7}$ and then chlorine, being more electronegative, will have (-7) as its oxidation number. But we know that the oxidation number of $\ce{Cl}$ lies between (-1) and (+7).
Thoughts? |
Since water can be either hot or cold, does its temperature affect its ability to extinguish fires?
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Does the temperature of water affects its ability to extinguish fires? |
Is it possible to make a solution of pH 7 phosphate buffer solution using phosphoric acid and $\ce{K2HPO4}$ ? How can I calculate the amount of $\ce{K2HPO4}$ needed for 1L of phosphoric acid ?
Edit:
I have 50 mL of 0.2M $\ce{H3PO4}$ solution. How can I convert this solution into 50 mL of pH 7 buffer solution by a... |
I know that there are some sites like Sigma Aldrich and AIST for $\ce{^1H}$ NMR and $\ce{^13C}$ NMR, but was wondering if there were any free sites to compare $\ce{^31P}$ NMR spectra? |
Are there any free $\ce{^31P}$ NMR spectral libraries? |
For an example, let's assume that we have a gas $P(g)$ inside a chamber and when the temperature inside it increases to a certain value there is an equilibrium prevail inside the system.
So for the sake of the question , let us assume that equilibrium prevail inside is ,
$$\ce{P(g) <=> Q(g) + R (g)},$$
An... |
What are the possible changes occur if I add an inert gas to a chamber containing another few different gases? |
*Ok so this is the proposed mechanism for the Wittig Reaction as stated by my textbook, LG Wade. I have some doubts regarding this mechanism:*
![enter image description here][1]
![enter image description here][2]
> 1) Why is only triphenyl phosphine used here? Why not some stronger
> nucleophile like ... |
For an example, let's assume that we have a gas $\ce{P(g)}$ inside a chamber and when the temperature inside it increases to a certain value there is an equilibrium prevail inside the system.
So for the sake of the question , let us assume that equilibrium prevail inside is ,
$$\ce{P(g) <=> Q(g) + R (g)},$$
... |
I've become very curious about (electrochemical) atomic layer deposition (ALD) via surface limited redox replacement. Since the technique allows for deposition of metals in atom thick layers it's possible to create films of nearly exact atomic thickness. However, I haven't found any reference that describes how one can... |
I've become very curious about (electrochemical) atomic layer deposition (ALD) via surface limited redox replacement.
Since the technique allows for deposition of metals in atom thick layers it's possible to create films of nearly exact atomic thickness. However, I haven't found any reference that describes how one... |
There are quite a few it seems, a couple of examples are below:
University of Wisconsin [Phosphorus NMR data][1], starts with a shifts overview.
Stanford's Magnetic Resonance Laboratory site [P NMR at the SMRL][2], provides comparisons and a protocol for testing.
A general NMR site is [NMR Wiki][3] - has many ... |
Are there any free $^{31}$P NMR spectral libraries? |
Does the temperature of water affect its ability to extinguish fires? |
For an example, let's assume that we have a gas $\ce{P(g)}$ inside a chamber and when the temperature inside it increases to a certain value there is an equilibrium prevail inside the system.
So for the sake of the question , let us assume that equilibrium prevail inside is ,
$$\ce{P(g) <=> Q(g) + R (g)},$$
... |
An E2 (or E1cb) mechanism requires antiperiplanar configuration. In case of restricted rotations, like in cycles, where rotation is not possible to achieve the antiperiplanar configuration, elimination occurs to favour the Hofmann product instead of the Zaitsev, if antiperiplanar configuration is possible at the less s... |
An $E2$ (or $E1cb$) mechanism requires antiperiplanar configuration. In case of restricted rotations, like in cycles, where rotation is not possible to achieve the antiperiplanar configuration, elimination occurs to favour the Hofmann product instead of the Zaitsev, if antiperiplanar configuration is possible at the le... |
In my textbook, a footnote says:
> In case of weak acids, on dilution the total number of $\ce{H^{+}}$ ions in solution increases because dissociation of the weak acid increases
This didn't make sense to me however. Consider the general dissociation reaction of a weak acid:
$$\ce{HA (aq) + H_2O \rightlefthar... |
In my textbook, a footnote says:
> In case of weak acids, on dilution the total number of $\ce{H^{+}}$ ions in solution increases because dissociation of the weak acid increases
This didn't make sense to me however. Consider the general dissociation reaction of a weak acid:
$$\ce{HA (aq) + H_2O \rightlefthar... |
Can anyone tell me - what is the difference between these two compounds:
N(alpha)-acetyl-ornithine (http://pubchem.ncbi.nlm.nih.gov/compound/907)
N(delta)-acetyl-ornithine (http://pubchem.ncbi.nlm.nih.gov/compound/439232)
The only difference I can think of is the chiral properties of the nitrogen atom, i.e... |
For a titration of potassium permanganate into a standard acidified solution of hydrated iron (II) ammonium sulfate, the solution seems to end up brown (due to the formation of manganese dioxide) during the titration unless the titration is carried out extremely slowly. How can I minimise this? Adding sulfuric acid to ... |
Can anyone tell me what the difference between these two compounds is:
[N(alpha)-acetyl-ornithine](http://pubchem.ncbi.nlm.nih.gov/compound/907)
[N(delta)-acetyl-ornithine](http://pubchem.ncbi.nlm.nih.gov/compound/439232)
The only difference I can think of is the chiral properties of the nitrogen atom, i.e. n... |
As an example, let's assume that we have a gas $\ce{P(g)}$ inside a chamber and when the temperature inside it increases to a certain value there is an equilibrium that prevails inside the system.
So for the sake of argument, let us assume that this equilibrium is:
$$\ce{P(g) <=> Q(g) + R (g)},$$
And let's as... |
What are the possible changes that might occur if I add an inert gas to a chamber containing another few different gases? |
In molecular orbital theory bonding of two atoms can be seen as addition or subtraction of the wave functions of these atoms. Addition seems pretty logical and straight-forward - atoms overlap their electron clouds and probability to find an electron in it increases. Subtraction is the thing I don't get. How can the pr... |
Subtracting wave functions? |
In my textbook, a footnote says:
> In case of weak acids, on dilution the total number of $\ce{H^{+}}$ ions in solution increases because dissociation of the weak acid increases
This didn't make sense to me however. Consider the general dissociation reaction of a weak acid:
$$\ce{HA (aq) + H_2O \rightlefthar... |
An $\mathrm{E2}$ (or $\mathrm{E1cb}$) mechanism requires antiperiplanar configuration. In case of restricted rotations, like in cycles, where rotation is not possible to achieve the antiperiplanar configuration, elimination occurs to favour the Hofmann product instead of the Zaitsev, if antiperiplanar configuration is ... |
Can anyone tell me what the difference between these two compounds is:
[N(alpha)-acetyl-ornithine](http://pubchem.ncbi.nlm.nih.gov/compound/907)
[N(delta)-acetyl-ornithine](http://pubchem.ncbi.nlm.nih.gov/compound/193343)
The only difference I can think of is the chiral properties of the nitrogen atom, i.e. n... |
In my textbook, a footnote says:
> In case of weak acids, on dilution the total number of $\ce{H^{+}}$ ions in solution increases because dissociation of the weak acid increases
This didn't make sense to me however. Consider the general dissociation reaction of a weak acid:
$$\ce{HA (aq) + H_2O \rightlefthar... |
Are there any free phosphorus-31 NMR spectral libraries? |
I have read many books on standard electrode potential and they define the term in various ways but I just can’t seem to get an intuitive idea of it.
$$\ce{Cu^2+ + 2e- <=> Cu}$$
Standard electrode potential, $E= 0.34\ \mathrm{V}$
Does this mean that when $1\ \mathrm{C}$ of charge passes from the hydrogen half ... |
I recently been studying different radioactive elements. The most difficult part is find the output of these elements in the form of kWh.
Is there a database or chart of these elements out put?
And most importantly does anyone know the kWh of 1 kg of Technetium99? |
I recently been studying different radioactive elements. The most difficult part is find the output of these elements in the form of kWh.
Is there a database or chart of these elements' output?
And most importantly does anyone know the kWh of $1~ kg$ of $\ce{^99Tc}$? |
kWh of radioactive elements database? |
Tc-99m is a nuclear isomer of Tc-99, which is excited by 142.6 keV. Therefore, when one atom decays to Tc-99, it releases 142.6 keV, mostly as gamma radiation, but also some internal conversion occurs. Therefore, for 1 kg of Tc-99m (10.1 mol):
$$
(142.6\ \mathrm{keV})(10.1\ \mathrm{mol})N_A = 8.673\times 10^{29}\ \... |
Earlier today I was preparing an ester (propyl ethanoate) and I noticed that instead of putting the propanol, ethanoic acid and H2SO4 in the test tube and warming it (taking time and external energy) I could instead mix sulphuric acid with the ethanoic acid, which made the test tube go very hot, and then by adding the ... |
H2SO4 with ethanoic acid reaction? |
$\ce{^{99m}Tc}$ is a nuclear isomer of $\ce{^{99}Tc}$, which is excited by 142.6 keV. Therefore, when one atom decays to $\ce{^{99}Tc}$, it releases 142.6 keV, mostly as gamma radiation, but also some internal conversion occurs. Therefore, for 1 kg of $\ce{^{99m}Tc}$ (10.1 mol):
$$
(142.6\ \mathrm{keV})(10.1\ \math... |
Earlier today I was preparing an ester (propyl ethanoate) and I noticed that instead of putting the propanol, ethanoic acid and $\ce{H2SO4}$ in the test tube and warming it (taking time and external energy) I could instead mix sulphuric acid with the ethanoic acid, which made the test tube go very hot, and then by addi... |
Earlier today I was preparing an ester (propyl ethanoate) and I noticed that instead of putting the propanol, ethanoic acid and $\ce{H2SO4}$ in the test tube and warming it (taking time and external energy) I could instead mix sulphuric acid with the ethanoic acid, which made the test tube go very hot, and then by addi... |
As a project I am trying to plate mercury onto a powdered metal amalgam of $\ce{Cu}$ & $\ce{Ag}$. I am using solution of $\ce{HgCl2}$ in normal $\ce{HCl}$ (a reducing agent), Any thoughts for increasing the efficiency of plating process on the metal alloy powder? How can we improve the $\ce{Hg}$ plating on the metal po... |
I'm working on this problem:
> 25.0ml of 0.10M CH$_3$COOH is titrated with 0.10M NaOH. What is the pH after the addition of 30.0ml NaOH?
In broad strokes, as I understand it, the sodium hydroxide in this case would completely consume the acetic acid, leaving a solution of acetate ions, Na$^+$ and OH$^-$.
Wha... |
I understand that a combination reaction is one where two substances combine to form a third substance, like with Na + Cl = NaCl but I do not understand why CaO + SO2 --> CaSO3 is not a combination reaction. After all, it is creating a third substance, so why is it not a combination redox reaction? |
Why is CaO + SO2 --> CaSO3 not a Combination Redox Reaction? |
I understand that a combination reaction is one where two substances combine to form a third substance, like with $\ce{Na + Cl -> NaCl}$ but I do not understand why $\ce{CaO + SO2 -> CaSO3}$ is not a combination reaction. After all, it is creating a third substance, so why is it not a combination redox reaction? |
I'm working on this problem:
> 25.0ml of 0.10M $\ce{CH3COOH}$ is titrated with 0.10M $\ce{NaOH}$. What is the pH after the addition of 30.0ml $\ce{NaOH}$?
In broad strokes, as I understand it, the sodium hydroxide in this case would completely consume the acetic acid, leaving a solution of acetate ions, $\ce{Na^... |
I understand that a combination reaction is one where two substances combine to form a third substance, like with $\ce{2Na + Cl2 -> 2NaCl}$ but I do not understand why $\ce{CaO + SO2 -> CaSO3}$ is not a combination redox reaction. After all, it is creating a third substance, so why is it not a combination redox reactio... |
Why is CaO + SO2 --> CaSO3 not a combination redox reaction? |
I'm working on this problem:
> $25.0\:\mathrm{mL}$ of $0.10\:\mathrm{M}$ $\ce{CH3COOH}$ is titrated with $0.10\:\mathrm{M}$ $\ce{NaOH}$. What is the $\mathrm{pH}$ after the addition of 30.0ml $\ce{NaOH}$?
In broad strokes, as I understand it, the sodium hydroxide in this case would completely consume the acetic a... |
As mentioned in the title, why do we use the Kovat's index in Gas Phase Chromatography? It seems a little arbitrary to compare everything to the order that n-alkanes (such as n-pentane, n-hexane, and n-heptane) emerge from the column, and I am curious to know reasons why we use such an index. Thanks in adavance |
What is the Kovat's index used for? |
As mentioned in the title, why do we use the Kovat's Index in gas phase chromatography? It seems a little arbitrary to compare everything to the order that n-alkanes (such as n-pentane, n-hexane, and n-heptane) emerge from the column, and I am curious to know reasons why we use such an index. |
What is the Kovat's Index used for? |
The classic paper of Dr. Norskov (https://profiles.stanford.edu/jens-noerskov) explained this phenomenon very well. (Off topic: Dr. Norskov is like the godfather of catalysis and i had a chance to meet him at a summer school and that was a great experience for me :) )
The inertness of metal surface to adsorb depends... |
The classic paper of Dr. Norskov (https://profiles.stanford.edu/jens-noerskov) explained this phenomenon very well. (Off topic: Dr. Norskov is like the godfather of catalysis and I had a chance to meet him at a summer school and that was a great experience for me.
The inertness of metal surface to adsorb depends on... |
What is the ground state electron configuration of chromium?
Is it $\ce{[Ar]}4s^23d^4$ or
Is it $\ce{[Ar]}4s^13d^5$ |
I've had already been aware of the fact that metallic aluminum can be degraded by coming in contact with mercury, but also came across another question more recently [here][1] explains a similar reaction with liquid gallium.
So my question is more general regarding corrosive action of *any* liquid metal on other met... |
We want to nanoencapsulate our pesticide using the following protocol; but we dont have AOT surfactant. So, what can I use instead of AOT in the following protocol?
Sodium alginate solution in water was emulsified into dioctyl sodium sulfo-succinate (AOT) solution in methylene chloride by sonication for 1 min over ... |
what can I use instead of AOT in the following protocol? |
Are C-chain molecules as in the picture likely to occur or do they exist at all?
![C-chain][1] and so on...
[1]: https://i.stack.imgur.com/jBzPt.png |
We want to nanoencapsulate our pesticide using the following protocol; but we don’t have AOT surfactant. So, what can I use instead of AOT in the following protocol?
> Sodium alginate solution in water was emulsified into dioctyl sodium sulfo-succinate (AOT) solution in methylene chloride by sonication for 1 min ove... |
What can I use instead of AOT in the following protocol? |
Europium is apparently [used][1] as an anti-counterfeiting measure in Euro bank notes because of its fluorescence under UV light.
Is there any reason why it is specifically Eu and not any of the other lanthanides that fluoresce as well?
Is it because Eu is relatively rare and expensive so it's harder to fake? Is ... |
Why is europium used in Euro bank notes? |
Europium is apparently [used][1] as an anti-counterfeiting measure in Euro bank notes because of its fluorescence under UV light.
Is there any reason why it is specifically $\ce{Eu}$ and not any of the other lanthanides that fluoresce as well?
Is it because $\ce{Eu}$ is relatively rare and expensive so it's harde... |
We usually use super glue to stick any two objects but I was wondering like why don't they stick inside their own bottle ? |
Why super glue does not stick inside their own bottle? |
I’m working on this problem:
> $25.0\:\mathrm{ml}$ of $0.10\:\mathrm{M}$ $\ce{CH3COOH}$ is titrated with $0.10\:\mathrm{M}$ $\ce{NaOH}$. What is the $\mathrm{pH}$ after the addition of $30.0\:\mathrm{ml}$ $\ce{NaOH}$?
In broad strokes, as I understand it, the sodium hydroxide in this case would completely consume... |
For example, oxepane is a 7-atom ring. Can there be 8-atom ring or 9-atom ring … or million-atom ring to infinity? |
Doing a first year chem class.
Just read through the molecular naming of compounds and now I'm confused as to why $\ce{CaCl2}$ is called calcium chloride and not calcium dichloride? |
Why is CaCl2 called calcium chloride? |
>Why do we use the Kováts index?
The Kováts index is used to normalize GC data. [This Wikipedia page](https://en.wikipedia.org/wiki/Kovats_retention_index)(though not very long), sums up why you would want to do so.
Retention times of the same compound on even two different versions of identical instrument with ... |
I am writing an essay on the origin of life and I was reading an article on hydrothermal vents. [(Peptides by Activation of Amino Acids with CO on (Ni,Fe)S Surfaces: Implications for the Origin of Life)][1].
It appears that (Ni,Fe)S has played an important role in protein synthesis, but I wanted to know more about ... |
Boiling point, as I understand, generally depends on molar mas and the inter-molecular interactions in the liquid phase.
1. What are the other influencing factors?
2. What inter molecular forces are present in liquid metals?
3. Why does boiling point of Manganese deviate?
|
What does boiling point of a metal depend on, specifically Manganese? |
Boiling point, as I understand, generally depends on molar mass and the inter-molecular interactions in the liquid phase.
1. What are the other influencing factors?
2. What inter molecular forces are present in liquid metals?
3. Why does boiling point of manganese deviate?
|
What does boiling point of a metal depend on, specifically manganese? |
I find this question to be quite interesting as it clearly pertains to non-covalent interactions.
I have analyzed two conformations of the diborane-HCl dimer system, one with the chlorine on HCl orientated toward diborane (HCl-Dib) and one with the chlorine oriented away from the [diborane][1] (ClH-Dib). For comp... |
Boiling point, as I understand, generally depends on molar mass and the intermolecular interactions in the liquid phase.
1. What are the other influencing factors?
2. What intermolecular forces are present in liquid metals?
3. Why does the boiling point of manganese deviate?
|
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