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>What is the structure of $\ce{FeSO4 \cdot NO}$ that is formed when $\ce{NO}$ is passed through ferrous sulphate solution?
The structure is octahedral.
The Fe ion is at the center of the octahedron.
Five water molecules and the NO molecule occupy the vertices of the octahedron.
Sulfate is a separate spectat... |
How does Lewis acidity correlate with bactericidal activity? I read on Wikipedia that the two are positively correlated but no explanation was given.
Does it have to do with the movement of electrons - i.e. a current? I'm guessing that having a current passed through you isn't good for you.
I suppose also that ... |
From my understanding NMR spectroscopy works by analyzing the resonance frequency of each structure around a hydrogen or carbon. Since every structure is unique and has unique resonance frequency it is easy to identify them? Right??
What other nuclei besides hydrogen and carbon 13 could be detected using NMR?
Is ... |
Take as example this http://njcmr.njit.edu/distils/lab/aspirins/nap4.html
or even better this http://wwwchem.csustan.edu/consumer/aspirincons/aspirincons.htm
> **Wash the crystals with 2-3 ml of chilled water.**
Why does the aspirin need to be cooled down? And why do we wash the aspirin with chilled water? |
I have searched for this answer on line but I cannot find an answer. I know this is a Le Chatelier's principle question.
The question:
2NO(g) + H_2(g) <--> N_{2}O(g) + H_{2}O + 351 kilojoules
If the temperature is increased in the reaction above, which of the following occurs?
A)The concentration of H_{2}O incr... |
I have searched for this answer on line but I cannot find an answer. I know this is a Le Chatelier's principle question.
The question:
$\ce{2NO(g) + H_2(g) <=> N_{2}O(g) + H_{2}O} + 351~kilojoules$
If the temperature is increased in the reaction above, which of the following occurs?
A)The concentration of $\c... |
Assume these 2 reactions. I must write the Lewis structures of the products.
1) (a benzene ring + CO_2H on one end, I don't know its name) + CH3CH2OH ---- H+ ----> ??????????
2) CH3CH2OH + Acetic Anhydride ------ H+ ------> ?????????????????
**MY APPROACH**
for the **first** reaction I will get... |
What products will the following reactions yield? |
> Since every structure is unique and has unique resonance frequency it is easy to identify them? Right??
Firstly, in NMR we do not deal with structures but instead nuclei. Scroll **all the way to the bottom** to see a list of some NMR active nuclei :
http://www.chem.wisc.edu/areas/reich/nmr/07-multi-01-nuclear.h... |
> Since every structure is unique and has unique resonance frequency it is easy to identify them? Right??
Firstly, in NMR we do not deal with structures but instead nuclei. Scroll **all the way to the bottom** to see a list of some NMR active nuclei :
http://www.chem.wisc.edu/areas/reich/nmr/07-multi-01-nuclear.h... |
Which path do I take when we have a branched chiral center? None of the textbooks I've consulted adequately covers this or even provides an example problem in which there was branching.
|
R, S Configuration and Branching - Which Path? |
Which path do I take when we have a branched chiral center? None of the textbooks I've consulted adequately covers this or even provides an example problem in which there was branching.
![enter image description here][1]
[1]: https://i.stack.imgur.com/jiAx2.png
Consider the above:
1) Chiral carbon with... |
Assume these 2 reactions. I must write the Lewis structures of the products.
1. $\ce{H5C6-COOH + CH3CH2OH ->[\ce{H+}] ?}$
(comment: A benzene ring + $\ce{CO_2H}$ on one end, I don't know its name)
2. $\ce{CH3CH2OH + (CH3CO)2O ->[\ce{H+}]?}$ (comment: Acetic Anhydride)
#My approach
For the **first** react... |
I have searched for this answer on line but I cannot find an answer. I know this is a Le Chatelier's principle question.
The question:
$\ce{2NO(g) + H_2(g) <=> N_{2}O(g) + H_{2}O} + 351~\mathrm{kJ}$
If the temperature is increased in the reaction above, which of the following occurs?
A) The concentration of... |
I've always been told that carbon links with four hydrogens and nitrogen with three hydrogens like in benzine and hexazine. What's the name of this bonding and how do you come up with the number? Sorry if this is a very basic question, i'm trying to refine my chemistry while learning the terminology in english. |
How do i find out the number of bonds an atom must link to? |
I've always been told that carbon links with four hydrogens and nitrogen with three hydrogens like in benzene and hexazine. What's the name of this bonding and how do you come up with the number? Sorry if this is a very basic question; I'm trying to refine my chemistry while learning the terminology in English. |
I've always been told that carbon links with four hydrogens and nitrogen with three hydrogens like in methane and ammonia. What's the name of this bonding and how do you come up with the number? Sorry if this is a very basic question; I'm trying to refine my chemistry while learning the terminology in English. |
If you have some sample in solution (of a pure R substance), wouldn't the individual molecules all have a random orientation in space? Or do the photons emitted into the solution cause all of the molecules to align? Or is it just that, statistically, a given percentage of the particles will have an orientation which co... |
How does polarimetry account for the orientation of the molecules? |
I was searching for a sol gel method for deposition of carbon nanotube thin films and there aren't too many articles on that. Does anybody know the reason? Is it because Carbon nanotubes are difficult to disperse in many solvents or? Does anyone know if it is possible to effectively use a sol gel method to make a CN... |
Is there a good sol gel method for carbon nanotube thin film deposition? |
At Wikipedia a [monomer][1] is defined to be
> a molecule that may bind chemically to other molecules to form a
> polymer.
A [polymer][2] is defined to be
> a molecule composed of many monomers.
These definitions are obviously circular.
**Are there non-circular definitions of monomers and polymers?**
... |
How does formylation, of the sort shown here: http://en.wikipedia.org/wiki/File:N-formylmethionine_synthesis.png, from this Wikipedia page: http://en.wikipedia.org/wiki/Formylation effect the hydrophobicity of the target protein? Can we say anything general about adding a formyl group to a nitrogen? |
How does formylation of a nitrogen change the hydrophobicity of a target protein? |
I have been given a protein of unknown concentration and have been asked to make a set of standards using a protein with a known concentration so we can quantify roughly via dot blot.
I need to know how to work out the calculation part. I would like to learn both mass and molar.For example, the information I have f... |
How do I go about calculating protein concentration to make a set of protein standards for protein quantification via dot blot? |
In my teacher's power-point states that we must consider that inductive effect in $CH_{3}COOH$ exists because of the electron deficiency in $C$ (partial positive charge $\delta^{+}$) as a result of the electronegativity of the double bonded $O$. As you may notice in the figure [1] although the single bonded $O$ is more... |
I'm trying to apply conjugate theory, which I can apply very well to acids/bases, to redox. Can you verify my logic, which I have broken down below?
1) I know that solid sodium is a strong reducer.
2) I know this because solid sodium when placed in water reacts violently, forming, among other products, sodium i... |
I'm trying to apply conjugate theory, which I can apply very well to acids/bases, to redox. Can you verify my logic, which I have broken down below?
1) I know that solid sodium is a strong reducer.
2) I know this because solid sodium when placed in water reacts violently, forming, among other products, sodium i... |
I'm trying to apply conjugate theory, which I can apply very well to acids/bases, to redox. Can you verify my logic, which I have broken down below?
1) I know that solid sodium is a strong reducer.
2) I know this because solid sodium when placed in water reacts violently, forming, among other products, sodium i... |
In my teacher's power-point states that we must consider that inductive effect in $CH_{3}COOH$ exists because of the electron deficiency in $C$ (partial positive charge $\delta^{+}$) as a result of the electronegativity of the double bonded $O$. As you may notice in the figure [1] although the single bonded $O$ is more... |
What is the mechanism for the electrolysis of water? I understand that hydrogen and oxygen gas are made, but how exactly does this happen when electrons are passed through water? A diagram would be very useful.
|
> Why do we consider that double bonded O establishes that δ+ on our C
> (and creates an electron withdrawing inductive effect −I) and not the
> single bonded O?
Look at the resonance structures for acetic acid in the top line of the following drawing. We can see that the middle resonance structure takes the pi e... |
> Why do we consider that double bonded O establishes that δ+ on our C
> (and creates an electron withdrawing inductive effect −I) and not the
> single bonded O?
Look at the resonance structures for acetic acid in the top line of the following drawing. We can see that the middle resonance structure takes the pi e... |
In other words, are these two structures equivalent?
![enter image description here][1]
![enter image description here][2]
[1]: https://i.stack.imgur.com/0Wczz.png
[2]: https://i.stack.imgur.com/eVHSv.jpg |
Does the Arrangement of Atoms Matter Around Chiral Carbon? |
I could not find this anywhere on the net.
I am asking what is amine inversion and how does it affect basicity?
For instance why is Et3N less basic than cyclohexan-amine despite the +I from Et groups.
|
What is the order of basicity between Me2Nh,Me3N,MeNH2 in a protic solvent.
It has something to do with field effect which I could not understand and could not find anywhere.
Can someone please explain?
Thanks |
What are the complete steps of reaction from Sodium Benzoate and Ascorbic acid to Benzene? I can't seem to visualize it, and, much less, find anything online regarding the actual steps of the reaction. |
What is the complete mechanism of reaction for Sodium Benzoate and Ascorbic acid? |
What is the order of basicity between $\ce{Me2NH}$, $\ce{Me3N}$, $\ce{MeNH2}$ in a protic solvent.
It has something to do with field effect which I could not understand and could not find anywhere.
Can someone please explain?
|
In preparation for the Birch reduction, I am trying to prepare an electride salt, [Na(NH3)6]+, e-. This salt should be brilliant blue, as far as I know, but I am getting a black sludge when adding sodium to the liquid anhydrous ammonia at -60 Celsius or so.
Is this because the salt is missing the electron?
How do I... |
I came across this question in a test:
>The enol form is the ________ form for 3-hydroxy pent-2-enoate? (major/minor)
My argument is that the enol form must be more stable because of hydrogen bonding in the enol form and subsequent six membered ring formation (chelation). However the keto form has no such stabil... |
Major form of methyl 3-hydroxy pent-2-enoate? |
I have read about "electroflocculation" that uses _less_ flocculant/alum, but is there a method – no matter how expensive or impractical – that uses _no_ flocculant at all? |
Water purification procedure that does not involve a flocculant of any kind? |
I read in a book that "sometimes, both the electrodes dip in the same electrolyte solution & in such cases we do not require a salt bridge" how is this possible??? |
I read in a book that "Sometimes, both the electrodes dip in the same electrolyte solution & in such cases we do not require a salt bridge".
How is this possible? |
Is there always a need for a salt bridge to let a galvanic cell work continuously? |
![enter image description here][1]
[1]: https://i.stack.imgur.com/Do52y.png
For the above molecule, I know that the longest carbon chain has 7 carbons, so the backbone is heptane.
The two substituents are at the 4 position on the heptane.
One of the substituents is a methyl group. That much is obvious... |
![enter image description here][1]
[1]: https://i.stack.imgur.com/Do52y.png
For the above molecule, I know that the longest carbon chain has 7 carbons, so the backbone is heptane.
The two substituents are at the 4 position on the heptane.
One of the substituents is a methyl group. That much is obvious... |
R,S in Cyclic Compounds - Path of Highest Priority? |
According to this video:
http://www.youtube.com/watch?v=ns4Py96Bkn8&NR=1
![enter image description here][1]
1) Is this true? (You might recall I asked a similar question about $\ce{sp^2}$ hybridization implying $\ce{sp^2}$ hybridization for all directly linked atoms a while back, but I couldn't remember my p... |
If we add an ionic solute to water, will the specific heat of the water be increased or decreased?
I understand that the specific heat is a measure of how much energy we must add to water for the average kinetic energy of the water molecules to go up by a certain unit.
I also understand that hydrogen bonding is... |
> 1) Is this true?
It's more or less true in the cases were hybridization methods \ techniques work. For example, when the hybridization of water is discussed it is often said that the central oxygen is more or less $\ce{sp^3}$ hybridized and therefor the two lone pairs on oxygen are in (roughly) $\ce{sp^3}$ orbita... |
What's a natural substitute for baking power or baking soda? I am doing a project where I need a raising agent in liquid form. Naturally I can't use anything carbonated so Baking powder/soda are out of question. Can someone help me with this? |
What's a natural substitute for baking power or baking soda? |
What's a natural substitute for baking power or baking soda? I am doing a project where I need a raising agent in liquid form. Naturally, I can't use anything carbonated so baking powder/soda are out of question. |
What's a natural substitute for baking powder or baking soda? |
How do I tell which one is cis/trans? I know the definitions: cis is same side; trans is across; but
1) What am I comparing here.
2) How do I compare/visualize?
![enter image description here][1]
[1]: https://i.stack.imgur.com/fmxjH.png |
How do I tell which one is cis/trans? I know the definitions: cis is same side; trans is across; but
1) What am I comparing here.
2) How do I compare/visualize?
![enter image description here][1]
![enter image description here][2]
[1]: https://i.stack.imgur.com/fmxjH.png
[2]: https://i.stack.i... |
I am not a chemist at all want wanted to help someone to get to the solution for the task of calculating the "pH of an aqueous solution of 0.01 nM KOH in water".
I hope I wasn't providing any wrong answer, and I'd really appreciate if my approach makes sense:
I was thinking that water also has OH- ions in conce... |
What are the complete steps of reaction from Sodium Benzoate and Ascorbic acid to Benzene? I can't seem to visualize it, and, much less, find anything online regarding the actual steps of the reaction.
Additionally: how does it make use of, say Cu(II) or Fe(III) to complete the reaction? It seems that the reaction c... |
How do I draw a double Newman projection for cyclohexane? Which bond(s) do I sight down?
![enter image description here][1]
From what I understand I sight down here:
![enter image description here][2]
[1]: https://i.stack.imgur.com/9UWXt.jpg
[2]: https://i.stack.imgur.com/Iws8E.png
The problem ... |
How do I draw a double Newman projection for cyclohexane? Which bond(s) do I sight down?
![enter image description here][1]
From what I understand, if we have 1-methylcyclohexane, we sight C1-C2 and C5-C4, as shown in my attempt below:
![enter image description here][2]
[1]: https://i.stack.imgur.c... |
I am not a chemist at all, but I wanted to help someone to get to the solution for the task of calculating the
>$\mathrm{p}\ce{H}$ of an aqueous solution of $0.01\:\mathrm{nM}~\ce{KOH}$ in water.
I hope I wasn't providing any wrong answer, and I'd really appreciate if my approach makes sense:
I was thinking t... |
Your result is correct but I don't agree with your method. Your method would fail under certain circumstances. Which circumstances you might ask? When the pH of the solution is _actually_ between 6.8 and 7.2. In these cases, your assumption that water auto-ionizes to create exactly $\ce{[HO^-]} = 1.0\times10^{-7} M $ w... |
This does not compute for me:
![enter image description here][1]
[1]: https://i.stack.imgur.com/qwRvR.png
Why would the four-carbon butyl group have a lower relative priority than the 3 carbon isopropyl group?
If we compare the carbons one by one between the isopropyl and the butyl group, we'd run out o... |
Let's have a look at what IUPAC say; they would be a reliable source to get definitions of chemical terminology from:
[Monomer][1]:
> "A substance composed of monomer molecules."
[Monomer molecules][2]:
> "A molecule which can undergo polymerization thereby contributing
> constitutional units to the essent... |
I could not find this anywhere on the net.
I am asking what is amine inversion and how does it affect basicity?
For instance why is $\ce {Et3N}$ less basic than cyclohexyl-amine despite the +I from Ethyl groups.
|
I could not find this anywhere on the net.
I am asking what is amine inversion and how does it affect basicity?
For instance why is $\ce{Et3N}$ less basic than cyclohexyl-amine despite the $+I$ from ethyl groups.
|
If I know the chemical shift tensor (from ab initio methods), $\sigma$, for each atom in my structure, is it possible to construct an NMR spectra for my system? If yes, how and what mathematical implementations do I need? |
How to construct NMR spectra from chemical shift tensors? |
Why is silicon oxide giant covalent structure? Why it doesn't bond like carbon dioxide? Thank you |
Why is silicon oxide giant covalent structure? |
I am confused, should it be 2 or 4? If I consider $\ce{BeCl2}$ as a chain structure the coordination number is 4, and in the gas phase it is 2. Please, could you give an explanation for this?
|
Why is arsenous acid denoted $H_3AsO_3$? |
Why is arsenous acid denoted $\ce{H_3AsO_3}$? |
1. the combustion of 0.214g of sulfur provided exactly 0.428g of sulfur dioxide. After a second try, 0.782g of SO2 was obtained. What mass of sulfur was used?
2. The combustion of lithium forms lithium oxide. Combustion involving a 1.451g sample of oxygen results in obtaining 2.710g of Li2O. What mass of lithium was... |
Do carboxylic acids (or any compound with a carbonyl group) count as a branch chained organic compound due to the C=O? Or does it need a carbon - carbon branch?
![enter image description here][1]
[1]: https://i.stack.imgur.com/xefo2.png |
What is true about this equation, at equilibrium, and why? |
Technetium is probably the most awkward element of the periodic table for me. It seems to me that Technetium is an exception, in the sense that it doesn't have any stable isotopes, despite having a relatively low atomic number when compared to other unstable elements.
So I thought, maybe there is something special a... |
Why is Technetium unstable? |
For example, silver chloride, silver sulfide, and silver oxide are three exceedingly stable silver salts in water solution.
Why is it that silver forms such stable salts?
Does this have to do with charge density of the component ions? This doesn't seem to hold water because we know that silver oxide is much mor... |
Why are many silver salts insoluble? |
For example, silver chloride, silver sulfide, and silver oxide are three exceedingly stable silver salts in water solution.
Why is it that silver forms such stable salts?
Does this have to do with charge density of the component ions? This doesn't seem to hold water because we know that silver oxide is much mor... |
For example, silver chloride, silver sulfide, and silver oxide are three exceedingly stable silver salts in water solution.
Why is it that silver forms such stable salts?
Does this have to do with charge density of the component ions? This doesn't seem to hold water because we know that silver oxide is much mor... |
There was a section about atomic orbitals in my organic chemistry textbook that I did not quite understand. First the author explained a bit about the Schrödinger equation, which I understood to be (vaguely, they did not go to any detail, even omitting the formula all together) a equation that describes the likeliness ... |
For a school project, I am in a group tasked with calculating Avogadro's Number in multiple manners. Other than the Millikan Oil Drop Experiment, we know of no ways to compute it. A Google search yielded no methods that could be of use (either complex beyond the high school level, or through using a mole of materials... |
1. the combustion of 0.214g of sulfur provided exactly 0.428g of sulfur dioxide. After a second try, 0.782g of SO2 was obtained. What mass of sulfur was used?
2. The combustion of lithium forms lithium oxide. Combustion involving a 1.451g sample of oxygen results in obtaining 2.710g of Li2O. What mass of lithium was... |
Why does diamond conduct heat better than graphite? |
There was a section about atomic orbitals in my organic chemistry textbook that I did not quite understand. First the author explained a bit about the Schrödinger equation, which I understood to be (vaguely, they did not go to any detail, even omitting the formula all together) a equation that describes the likeliness ... |
In the Arrhenius equation do Arrhenius constant and activation energy depend on concentration ? (Their units do) |
How is Melotonin Synthesised? |
How is Melatonin Synthesised? |
I am dealing with the iodine clock reaction, which has the half-reactions:
$$\begin{align}&\ce{H_2O_2 (aq) + I^- (aq) \to I_2 (s) + 2 OH^- (aq)} & (slow) \\ &\ce{I_2 (s) + 2S_2O_3^{-2} (aq) \to{} 2I^- (aq) + S_4O_6^{-2} (aq)} & (fast) \end{align}$$
Now, I have to find the rate law. What I did was 4 solutions - one... |
What is the mechanism for the electrolysis of water? I understand that hydrogen and oxygen gas are made, but how exactly does this happen when electrons are passed through water? A diagram would be very useful.
Would this have anything to do with electronegativities? |
1. $\frac{0.214g}{0.428g} = \frac {x}{0.782g}$
2. Your answer is ok, but on an exam you want to solve quickly.
2.710g - 1.451g = ?
wasn't that easier?
3.
>3.35.967(0.00006) + 37.962(x) + 39.962(1-x) = 39.948
This is slightly wrong.
0.00006, x, 0.99994-x |
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