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Is it possible to predict the lines in the atomic emission spectrum of Na? |
Is the parent chain in the above case determined by atomic mass, alphabetical preference or any other rule? |
If there are two longest chains possible in an organic compound and both have the same number of substituents, how do we decide the parent chain? |
I know that one current area of research is ways to protect astronauts from ionizing radiation when they venture out of the atmosphere of Earth, but would that same ionizing radiation be a cause of concern when performing chemical reactions in space or in the atmosphere of planets with little atmosphere?
I'm aware t... |
Radiation in space and its effects on chemical reactions? |
What are the different properties that intermolecular forces and Intramolecular forces attribute to? For example, inters contribute to BPs, vapor pressures, etc. And intras are solubility (?). What are other properties and how? |
Why is sand/glass polar? How does lattice structure change polarity? |
I understand that the structure factor for a crystal is given by:
>$F_{hkl} = \displaystyle\sum_r f_{r} e^{2{\pi}i(hx_{r}+ky_{r}+lz_{r})} $
My textbook (''Structures of crystals'', Glazier) suggests that you can calculate structure factors if you know the lattice type and motif of the crystal, simply by finding t... |
Last week, I tried synthesizing acetylsalicylic acid - the reaction is shown below - using $\ce{H2SO4}$ as a catalyst. However, as the title suggests the synthesis failed as I used too much $\ce{H2SO4}$ - approximately four times more than the prescribed volume. Needless to say, I had to redo the synthesis.
![Synt... |
What are intramolecular molecular forces?
The forces(electrostatic force) between molecules of a compound. These forces are responsible for intermolecular distances and how tightly the molecules are held together. If the intermolecular forces([van der Waals force][1]) are large, it means the molecules are tightly held... |
> But I don't understand why - shouldn't more protons in the environment lead to faster protonation of the carbonyl oxygen of acetic anhydride? Could you please explain it to me?
The short answer is "side reactions". Without more information about your exact experimental conditions, or even better, data about the o... |
Is there more than one equation for Delta t(reaction)? |
> But I don't understand why - shouldn't more protons in the environment lead to faster protonation of the carbonyl oxygen of acetic anhydride? Could you please explain it to me?
The short answer is "side reactions". Without more information about your exact experimental conditions, or even better, data about the o... |
I'm not sure where you get the idea that glass is linear. What makes a glass is the lack of long range ordering, though in fused silica, the approximate tetrahedral structure of $\ce{SiO4}$ is maintained (this is a 2D section, the fourth oxygens are not shown):
![fused silica][1] [Source](http://commons.wikimedia.or... |
- What are the different properties that intermolecular forces and Intramolecular forces attribute to? _i.e._ intermolecular forces contribute to BPs, vapor pressures, etc.
- And intramolecular forces are solubility?
- What other properties are influenced by them and how? |
Suppose you have the following voltaic cell: $Sn_{(s)}|Sn^{+2}_{(aq, 1.0 M)}||Cu^{+2}_{(aq, 1.0 M)}|Cu_{(s)}$ and the salt bridge is $KNO_3$. What I don't understand is why you need to have $Sn^{+2}$ ions initially in the $Sn$ half cell. As $Sn$ is oxidized, electrons are supposed to travel through the wire connecting ... |
Why does the anode solution contain $SN^{+2}$ in a $Sn$-$Cu$ voltaic cell? |
Free silicon is not found in nature (in water, it might be present in the form Si(OH)$_{4}$). Some compounds of silicon, such as silane (SiH$_{4}$) will react spontaneously in aqueous environment, while the analogous methane won't.
Is there an explanation for the tendency of silicon compounds to react with water? |
Why does free silicon react with water? |
Why does the anode solution contain SN2+ in a Sn-Cu voltaic cell? |
Suppose you have the following voltaic cell: $\ce{Sn_{(s)}|Sn^{+2}_{(aq, 1.0 M)}||Cu^{+2}_{(aq, 1.0 M)}|Cu_{(s)}}$ and the salt bridge is $\ce{KNO_3}$. What I don't understand is why you need to have $\ce{Sn^{+2}}$ ions initially in the $\ce{Sn}$ half cell. As $\ce{Sn}$ is oxidized, electrons are supposed to travel thr... |
Free silicon is not found in nature (in water, it might be present in the form $\ce{Si(OH)_{4}}$. Some compounds of silicon, such as silane ($\ce{SiH_{4}}$) will react spontaneously in aqueous environment, while the analogous methane won't.
Is there an explanation for the tendency of silicon compounds to react with w... |
> Is there an explanation for the tendency of silicon compounds to react
> with water?
Reaction with water, oxygen, *etc*., the answer is the same and has to do with the strength of the $\ce{Si-O}$ bond. Let's compare the following two reactions:
$$\ce{CH4 + \frac{1}{2}O2 -> CH3OH}$$
$$\ce{SiH4 + \frac{1}{2}O2 ... |
Why does the anode solution contain Sn2+ in a Sn-Cu voltaic cell? |
Free silicon is not found in nature (in water, it might be present in the form $\ce{Si(OH)_{4}}$. Some compounds of silicon, such as silane ($\ce{SiH_{4}}$) will react spontaneously in an aqueous environment, while the analogous methane won't.
Is there an explanation for the tendency of silicon compounds to react w... |
- What are the different properties that intermolecular forces and Intramolecular forces attribute to? _i.e._ intermolecular forces contribute to BPs, vapor pressures, etc.
- And intramolecular forces are solubility?
- What other properties are influenced by them and how?
Specific problem: why does n-Butylami... |
- What are the different properties that intermolecular forces and Intramolecular forces attribute to? _i.e._ intermolecular forces contribute to BPs, vapor pressures, etc.
Specific problem: why does n-Butylamine have lower vapor pressure at room temperature than methanol? Explain in regards to IMFs. |
At my university there is some fields of chemistry that i don't know if i should focus on them...
How important are in biotechnology and medicinal chemistry those fields of chemistry? :
1. Quantum chemistry
2. Physical chemistry
3. Computional chemistry |
When neutral Cl atoms are bombarded by high energy photons, causing ejection of electrons, which subshells' ejected electrons will have highest velocity?
I chose 1s because I thought more energy is needed to ejected those electrons so they might have higher velocity. But my second choice 3s is right, but I can't exp... |
ATOM 22 N GLN L 3 23.945 -2.849 106.974 1.00 15.00 N
ATOM 23 CA GLN L 3 23.125 -2.052 106.036 1.00 15.00 C
ATOM 24 C GLN L 3 22.898 -0.648 106.616 1.00 15.00 C
ATOM 25 O GLN L 3 22.613 -0.491 107.825 1.00 15.00 O
In every amino acid there are two `O` atoms; which one is described by the (in th... |
About undocumented conventions(?) in PDB files |
> I am told that carbon dioxide is IR inactive.
You're right, **that's not true**. Since carbon dioxide is linear it has 3n-5 = 4 vibrations and they are pictured below.
![enter image description here][1]
- The symmetric stretch does not result in a change (of the initially
zero dipole moment), so it is ... |
First, your PDB data seems to have some formatting issues, in that the columns are in the wrong places. I'm not sure if it's actually messed up, or if it simply got messed up when you posted it.
"In every amino acid there are two O atoms": True for a single amino acid; not true for an amino acid residue. I presum... |
First, your PDB data seems to have some formatting issues, in that the columns are in the wrong places. I'm not sure if it's actually messed up, or if it simply got messed up when you posted it.
"In every amino acid there are two O atoms": True for a single amino acid; not true for an amino acid residue. I presum... |
When does formal charge have more precedence over the octet rule / an atom having a full valence shell when drawing structures? When you draw BCl3 for example, there are no double bonds -- just three single bonds. Because of this B does not end up with 8 valence electrons. The explanation I have seen for this is that a... |
When does formal charge have more precedence over the octet rule / an atom having a full valence shell when drawing structures?
When you draw $\ce{BCl3}$ for example, there are no double bonds - just three single bonds. Because of this $\ce{B}$ does not end up with 8 valence electrons. The explanation I have seen f... |
When neutral $\ce{Cl}$ atoms are bombarded by high energy photons, causing ejection of electrons, which subshells' ejected electrons will have highest velocity?
I chose $1s$ because I thought more energy is needed to ejected those electrons so they might have higher velocity. But my second choice $3s$ is right, but ... |
We all know that pure water can't conduct electricity. But during electrolysis, if add a small amount of $\ce{HCl}$ acid inside, water could be decomposed to hydrogen gas and oxygen gas, as it is reduced at the cathode and oxidised at the anode. So why can't pure water just conduct electricity by electrolysis? |
- What are the different properties that intermolecular forces and Intramolecular forces attribute to? _i.e._ intermolecular forces contribute to BPs, vapor pressures, etc.
Specific problem: why does $\ce{n-Butylamine}$ have lower vapor pressure at room temperature than **methanol**? Explain in regards to IMFs. |
Hasok Chang, a chemist, but perhaps more a philosopher recently published the book [Is Water H2O][1]? . Chang used the question and an extensive web of arguments ultimately as a platform to support a pluralistic approach to scientific endeavor. I don't know that I buy it all, but in a latter chapter he made some statem... |
Really how rare are hydrogen atoms? |
A transition metal with 7 d electrons forms a complex ion with cyanide. I know that cyanide is a high field ligand, which means the electrons will pair before moving to the next energy level, but wouldn't there still be one unpaired electron? And wouldn't that make it paramagnetic? I was told that my prediction was wro... |
Is a transition metal with 7 d electons ever diamagnetic? |
First of all, any 'tin' can you are likely to find is actually made of steel. Tin is too expensive. Also, tin does not 'rust', although it oxidizes. Your rust is iron oxide. Galvanized steel is steel with a thin zinc coating, likely hot-dip galvanization. What you describe (crystalline surface or spangles sort of appea... |
So, I have to find the $\Delta T_{\mathrm{reaction}}$ of a solution for my lab report. Earlier in the lab, it gave the equation as
$\Delta T_{\mathrm{reaction}}=T_{\mathrm{mixture}}+\frac{1}{2}(T_{\mathrm{substance~1}}+T_{\mathrm{substance~2}})$
and all temperatures were at the exact time of mixing found from a ... |
Is there more than one equation for Delta T(reaction)? |
If doing a problem where you use the integrated rate law for a second order reaction (the 1/[] - 1/[] = kt)to first find k, then use that to find the halflife, does it matter if you use seconds, minutes, or whatever?
|
If doing a problem where you use the integrated rate law for a second order reaction ($\frac{1}{[\mathrm{A}]}-\frac{1}{[\mathrm{A_0}]}=kt$) to first find $k$, then use that to find the halflife, does it matter if you use seconds, minutes, or whatever?
|
I was wondering, how do I determine what metal (element) has the highest density by using the periodic table? Is it possible? |
Palladium hydride is an example of a hydride which contains H atoms in paddium's crystal lattice (which is fcc).
I would like to know if it's possible to predict if another hydride, $NbH_{x}$ could exhibit the same behavior.
I know that in an ionic solid, the fraction $$\frac{r_{+}}{r_{-}}$$
Can be used to predi... |
Palladium hydride is an example of a hydride which contains H atoms in paddium's crystal lattice (which is fcc).
I would like to know if it's possible to predict if another hydride, $\ce{NbH_{x}}$ could exhibit the same behavior.
I know that in an ionic solid, the fraction $$\frac{r_{+}}{r_{-}}$$
Can be used to ... |
I did a [google][1] and [chemistry.exchange][2] search and found several technical definitions of the exchange correlation hole.
The questions that I want to proposes are:
- What the exchange-correlation hole means in common words?
- How do you explain it to a non-literate person?
[1]: https://www.google... |
I'm trying to calculate the energy required to diaaasociate a single $CO_{2}$ molecule into it's respective elememts, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23}$ molecules of $CO_{2}$.
By dimensional analysis:
$$
\fr... |
Why does concentrated $\ce{H_2SO_4}$ oxidise? Due to the nascent oxygen it gives:
$$\ce{H_2SO_4}\rightleftharpoons\ce{SO_2 +H_2O +[O]}$$
Now, if you want $\ce{HCl}$ to be oxidised, the following reaction must exist:
$$\ce{HCl} +\ce{[O]}\rightarrow\ce{HClO}$$
But, you can observe that the reaction$$\ce{HClO}\rig... |
I'm trying to calculate the energy required to diaaasociate a single $CO_{2}$ molecule into it's respective elememts, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23}$ molecules of $CO_{2}$.
By dimensional analysis:
$$
\fr... |
Why does concentrated $\ce{H_2SO_4}$ oxidise? Due to the nascent oxygen it gives:
$$\ce{H_2SO_4}\rightleftharpoons\ce{SO_2 +H_2O +[O]}$$
Now, if you want $\ce{HCl}$ to be oxidised, the following reaction must exist:
$$\ce{HCl} +\ce{[O]}\rightarrow\ce{HClO}$$
But, you can observe that the reaction$$\ce{HClO}\rig... |
I'm trying to calculate the energy required to diaaasociate a single $CO_{2}$ molecule into it's respective elememts, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23}$ molecules of $CO_{2}$.
By dimensional analysis:
$\fra... |
I'm trying to calculate the energy required to diaaasociate a single $\ce{CO_{2}}$ molecule into it's respective elememts, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23}$ molecules of $\ce{CO_{2}}$.
By dimensional analysis... |
I'm trying to calculate the energy required to dissociate a single $\ce{CO_{2}}$ molecule into it's respective elements, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23}$ molecules of $\ce{CO_{2}}$.
By dimensional analysis:
... |
I'm trying to calculate the energy required to dissociate a single $\ce{CO_{2}}$ molecule into it's respective elements, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23}$ molecules of $\ce{CO_{2}}$.
By dimensional analysis:
... |
I'm trying to calculate the energy required to dissociate a single $\ce{CO_{2}}$ molecule into its respective elements, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23}$ molecules of $\ce{CO_{2}}$.
By dimensional analysis:
... |
I'm trying to calculate the energy required to dissociate a single $\ce{CO_{2}}$ molecule into its respective elements, and I'm given that it takes $ 373.6 \times 10^{3} \, \, \frac{joules}{gram} $ where $44.01 \,\, grams$ is the mass of $6.022 \times 10^{23} \,\, molecules$ of $\ce{CO_{2}}$.
By dimensional analys... |
You are not wrong in your understanding of a water softener, nor are you wrong in your understanding of a reverse osmosis filtration system.
>Does the RO filter care whether the supply water is salty or hard?
I would like to make the point that your RO filter is incapable of caring about the hardness of the water... |
When neutral $\ce{Cl}$ atoms are bombarded by high energy photons, causing ejection of electrons, which subshells' ejected electrons will have highest velocity?
I chose $1s$ because I thought more energy is needed to ejected those electrons so they might have higher velocity. My second choice $3s$ is right, but I ca... |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, or *Fermi hole*, is a region of space around an electron in which the probability of finding another electron in the same spin state is close to zero.
>... |
Why does concentrated $\ce{H_2SO_4}$ oxidise? Due to the nascent oxygen it gives:
$$\ce{H_2SO_4}\rightleftharpoons\ce{SO_2 +H_2O +[O]}$$
Now, if you want $\ce{HCl}$ to be oxidised, the following reaction must exist:
$$\ce{HCl} +\ce{[O]}\rightarrow\ce{HClO}$$
But, you can observe that the reaction$$\ce{HClO}\rig... |
How do I print property matrices in Avogadro? |
For an example let's assume we have a weak acid **HA** . And we add either a strong or a weak base.Then what I want to know is whether the weak ionization of the acid **HA** taken place?.
Weak ionization of acid **HA**. ==> ![enter image description here][1]
[1]: https://i.stack.imgur.com/YS5Vc.png |
Does a weak acid undergo it's weak ionization upon the addition of any kind of base? |
![enter image description here][1]
The marking scheme says that the molecule has both alkene and ketone.
So there is carbon to carbon double bond.ok.check there is alkene.But what about ketone.Ketone has this structure:
![enter image description here][2]
So can we technically say that there is ketone in it?... |
Why is is this molecule called ketene? |
In the case of the water solubility what you want to know is how powerful the secondary interaction of the compound that you are going to dissolve with water?If the compound that you wish to dissolve have hydrogen bonding then it's definitely dissolve in water .It does not mean others are insoluble in water.
B... |
The [Wikipedia][1] page has this:
>Ethoxylation is an industrial process in which ethylene oxide is added to alcohols and phenols to turn it into a surfactant.
How does the reaction proceed?
[1]: http://en.wikipedia.org/wiki/Ethoxylation |
What is the mechanism of ethoxylation? |
Palladium hydride is an example of a hydride which contains H atoms in palladium's crystal lattice (which is fcc).
I would like to know if it's possible to predict if another hydride, $\ce{NbH_{x}}$ could exhibit the same behavior.
I know that in an ionic solid, the fraction $$\frac{r_{+}}{r_{-}}$$
Can be used t... |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, is a region of space around an electron in which the probability of finding another electron is close to zero.
> How do you explain it to a non-literate... |
Why is Co(SCN)4 blue? |
>Why is $\ce Co(SCN)_4$ blue?
I simply can't predict the colors of such inorganic salts. I have learnt that $\ce {Co^{2+}}$ salts are pink in color. Also, if the ligand is a strong field ligand ($\ce {SCN-}$ in this case), then the splitting is more and the color should shift to the red side...
Is my concept wron... |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, is a region of space around an electron in which the probability of finding another electron is close to zero due to *electron correlation*.
> How do yo... |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, is a region of space around an electron in which the probability of finding another electron is close to zero due to *electron correlation*.
> How do yo... |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, is a region of space around an electron in which the probability of finding another electron is close to zero due to *electron correlation*.
> How do yo... |
![enter image description here][1]
technically the line between liquid and solid phase would go a long way before hitting the y-axis, but the point is it will eventually.
So the question remains, can any liquids, including water (with its unique phase diagram) be liquefied regardless of the pressure?
![enter i... |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, is a region of space around an electron in which the probability of finding another electron is close to zero due to *electron correlation*.
> How do yo... |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, is a region of space around an electron in which the probability of finding another electron is close to zero due to *electron correlation*.
> How do yo... |
In kinetics, zero order reactions are those reactions who are independent from the concentration of the reactant or the product. So their rate is equal to the constant **k**. But still we build the diagram where we find the correlation between concentration and time, where the slope is negative.
Why do we even write a... |
In ZnTPP (Zinc tetraphenylporphyrin), there are two Q-band emission peaks. When I run steady state emission measurements at different temperatures, the ratio of their respective peak intensities decreases with increasing temperature. This seems to me like an unusual behaviour compared to many other porphyrins, where th... |
Why might the ratio between two Q-band peaks in ZnTPP decrease with increasing temperature? |
> What the exchange-correlation hole means in common words?
Assuming that the probability is the common word, one could say that the *exchange-correlation hole*, is a region of space around an electron in which the probability of finding another electron is close to zero due to *electron correlation*.
> How do yo... |
Just about every vaping site claims that e-cigs are non-toxic. But anyone who has tried them will know better - they sting the tongue and burn the throat and lungs as bad or worse than tobacco.
The bases currently used for e-liquids are propylene glycol and glycerin. Unfortunately the vaping community has convinced ... |
E-cigs are toxic, but are there less toxic vapor bases that would work? |
The bases currently used for e-liquids are propylene glycol and glycerin. Unfortunately the vaping community has convinced itself these compounds are safe because they are classified as GRAS (generally recognised as safe). When placed directly in your mouth, that is true. But when heated they produce noxious levels of ... |
That other question has no alcohol in it.
The [Wikipedia][1] page has this:
>Ethoxylation is an industrial process in which ethylene oxide is added to alcohols and phenols to turn it into a surfactant.
How does the reaction proceed?
[1]: http://en.wikipedia.org/wiki/Ethoxylation |
Is this something to with the inert pair effect? |
Why does Thallium form TlF and TlF3 but aluminium only forms AlF3? |
I just noticed that picric acid is more acidic than carbonic acid. I have no idea why? Is there some rule I'm missing or is this one of those exceptions that I just have to remember? |
Why is picric acid more acidic than carbonic acid? |
Ahh, Thallium is a very nice element. *Because it's weird*.
> The +3 oxidation states are favorable except for the heavier elements, such as Tl, which prefer the +1 oxidation state due to its stability; this is known as the inert pair effect. [Chemwiki.UCDavis](http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descr... |
In the reaction $\ce{E(g) <=> P(g)}$ at 25 °C, equilibrium is reached when the pressure of the product is 0.100 that of the reactant. What is $\Delta G$ in joules?
Using $\Delta G = RT\ln K$, my answer is $-8.31 \times 298 \times \ln (1.00) \ \text{J}$.
However, the answer is $-8.31 \times 298 \times \ln (0.100) \ ... |
Does this have something to do with the *inert pair effect*? |
I bought a canned pineapple and finished the content. The part of the can that is in contact with the liquid appears like galvanized steel (crystalline surface or spangles sort of appearance), while the part that are not looks pretty shiny like the outside of the can.
I then washed the can and added water to it, an... |
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