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What is Polymer Environmental Resin (PER)? |
According to the definition of organic compounds:
> An organic compound is any member of a large class of gaseous, liquid, or solid chemical compounds whose molecules contain carbon.[this is an extracted definition from wiki encyclopedia [organic compound](http://en.wikipedia.org/wiki/Organic_compound)]
Car... |
What is the definition of organic compounds? |
How should I calculate the heat capacity of a calorimeter in this problem? |
How you you calculate/estimate the pH of a solution with 3 components all of different pHs?
Is there a paper describing this? |
How to estimate pH? |
We know that intermolecular Hydrogen bonding is seen in Hydrogen peroxide $(H_2O_2)$.But is intramolecular H-bonding,i.e. Hydrogen bond between an oxygen atom and a hydrogen atom attached to the adjacent Oxygen atom possible?How strong will it be,compared to intermolecular H-bonding and why? |
Does Hydrogen peroxide show intramolecular hydrogen bonding as well? |
Almost every share-house I've lived in has had some nasty looking solids collecting inside. I always regret looking inside the kettle because a cup of tea never tastes quite as good after you've seen this:
![enter image description here][1]
What *is* that stuff? What's the physical process that causes it to col... |
What is the solid crud that appears inside my kettle? |
Does hydrogen peroxide exhibit intramolecular hydrogen bonding interactions? |
So I have several descriptions of reactions and I have to give the net ionic equation. Are these just the equations or are they the proper net ionic ones?
Solid calcium is added to warm water.
Ca(s) + 2 H20(l) --> Ca(2+) (aq) + 2 OH(-) (aq) + H2(g)
Powdered magnesium oxide is added to a container of carbon diox... |
Are these the correct and complete net ionic equations? |
So I have several descriptions of reactions and I have to give the net ionic equation. Are these just the equations or are they the proper net ionic ones?
Solid calcium is added to warm water.
$$\ce{Ca_{(s)} + 2H20_{(l)} -> Ca^{2+}_{(aq)} + 2OH_{(aq)}^- + H2_{(g)}}$$
Powdered magnesium oxide is added to a conta... |
Let us consider a non-isothermal process inside a metal container. If we somehow are able to make the temperatures on the inside and outside the system remain same throughout the process, can it be called an adiabatic process? |
Can we have an adiabatic process in a sealed metal container? |
>So, what should be the redefined definition for organic compounds?
We should not define organic compounds. As F'x pointed out in the comments, the distinction between organic and inorganic is largely arbitrary and mostly based on a distortion of historical precedent.
Rather, we should classify compounds by the ... |
I read in several papers that DFT is notoriously bad at describing free oxygen molecules but in none of them an explanation or reference concerning the problem has been provided. I guess this has something to do with its triplet ground state but I haven't come across a good explanation yet. Could you help me out? |
Why is Density Functional Theory notoriously bad at describing oxygen molecules? |
> According to IUPAC recommendations for naming of inorganic compounds, the more electropositive element is written first with a suitable prefix, and the more electronegative element is written at the last with a suffix -*de* and a prefix.For example, $H_2O$ (Water) can be called *dihydrogen monooxide*.[this is an modi... |
In what order should the compounds containing Ru and Os, or Mo and W be named? |
How toxic is disilanol? |
If 15.0 mol of nitrogen are reacted with 30.0 mol of hydrogen, how much ammonia will be produced? |
If 15.0 mol of nitrogen are reacted with 30.0 mol of hydrogen, how much ammonia will be produced?
What I've tried is the following:
$\dfrac{N_2}{H_2}=\dfrac{1}{3}=\dfrac{15.0}{x}$
$\dfrac{N_2}{H_2}=\dfrac{1}{3}=\dfrac{x}{30}$
I'm not sure how to proceed from here. Any help would be appreciated. Thanks in a... |
If 15.0 mol of nitrogen are reacted with 30.0 mol of hydrogen, how much ammonia will be produced?
$N_2+3H_2\to2NH_3$
What I've tried is the following:
$\dfrac{N_2}{H_2}=\dfrac{1}{3}=\dfrac{15.0}{x}$
$\dfrac{N_2}{H_2}=\dfrac{1}{3}=\dfrac{x}{30}$
I'm not sure how to proceed from here. Any help would be ap... |
I read in several papers that DFT is notoriously bad at describing free oxygen molecules but in none of them an explanation or reference concerning the problem has been provided. I guess this has something to do with its triplet ground state but I haven't come across a good explanation yet. Could you help me out?
**... |
I read in several papers that DFT is notoriously bad at describing free oxygen molecules but in none of them an explanation or reference concerning the problem has been provided. I guess this has something to do with its triplet ground state but I haven't come across a good explanation yet. Could you help me out?
**... |
I read in several papers that DFT is notoriously bad at describing free oxygen molecules but in none of them an explanation or reference concerning the problem has been provided. I guess this has something to do with its triplet ground state but I haven't come across a good explanation yet. Could you help me out?
**... |
Silicon has been known to form analogues of organic compounds. For example, silicon with 4 hydrogen atoms forms silane as opposed to methane. This continues up the alkane list, with disilane for ethane, and so forth.
Silanes also have with hydroxyl groups to form "silanol." Thus, disilanol is the silicon analogue of... |
How you you calculate/estimate the pH of a solution with 3 components all of different pHs?
Is there a paper describing this?
For example:
0.1M Buffer PCTP at pH 9.5
1.6M Sodium Dihydrogen Phosphate at pH 3.39
0.2M Sodium Acetate at pH 9.0255
The measured pH is ~5.5.
If i take a weighted average i.e (0.1... |
Difficult to say. After a fair amount of Googling, I was unable to find any reliable sources on the compound you ask about, $\ce{H3Si-SiH2OH}$. From the Wikipedia article on [silanols](http://en.wikipedia.org/wiki/Silanol), it appears that the simple [silanols are not stable][1], but no reference is provided.
It sta... |
This isn't particularly a question about chemistry itself, but moreso the prospect of chemistry. I apologize if these are frowned upon here.
What kind of opportunities arise when you overlap chemistry and computer science? I'm a computer science major, but prior to going to university I had (and still have) a deep p... |
Overlap between computer science and chemistry? |
Why does water dissociate to
$H_{3}O^{+} + OH^{-}$
instead of $H^{+} + OH^{-}$?
This question came to surface when I was learning about acids and bases, and learned this definition:
$ph=-log_{10}[H^{+}]$
Which after looking at wikipedia, looks like a simplified definition, but it got me thinking - how can wa... |
Why Does Water Dissociate to H3O+ and OH- Rather than H+ and OH-? |
Why does water dissociate to
$\ce{H_{3}O^{+} + OH^{-}}$
instead of $\ce{H^{+} + OH^{-}}$?
This question came to surface when I was learning about acids and bases, and learned this definition:
$\mathrm{pH=}-\log_{10}[\ce H^{+}]$
Which after looking at wikipedia, looks like a simplified definition, but it got ... |
How can [epimerization][1] during peptide synthesis be detected? And how can we change or modify the coupling conditions to stop epimerization occurring?
[1]: http://en.wiktionary.org/wiki/epimerization |
Why does water dissociate to H3O+ and OH- rather than H+ and OH-? |
Beside construction of a solar power driven DIY cooler for beverages (like [here][1]), G M's post directing to use the heat of evaporation as a vehicle to cool a liquid may be indeed advantageous. What about using molar sieves in an outer shell of a barrel -- again, at the place of consumption, no electricity is neede... |
The question is this:
How many p-orbitals are there in each period?
a) 1
b) 3
c) 5
d) 7
e) 14
I take this to mean "how many p-orbitals are there in each period of the periodic table?" Looking at the p-block on the periodic table, it looks like there are 6 elements with p-orbitals per period. This isn't an ... |
How many p-orbitals are there in each period? |
In a closed, constant temperature container, reaction A(solid)<->B+C(gas) reached chemical equilibrium. If the volume of the container is reduced, when the equlibrium is reached again, the concentration of C equals the concentration of C before the reduction.
Is it possible that B is in gas state? |
According to the definition of ionic bond:
> An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
![enter image description here][1]
[1]: https://i.stack.imgur.com/pBN16.gif
If we consider the above figure showing formation of ion... |
Is ionic bond just formed by "electrostatic" interaction between two oppositely charged ions? |
This question may be closed as it doesn't deal with any specific chemistry concept.But, I think that many students have this problem. Physical chemistry is easy to study as I have to just understand the concepts(like in physics) and apply some tiny equations for calculations. In organic chemistry reaction mechanism hel... |
How to study(byheart) all those equations in inorganic chemistry? |
How to study (by heart) all the equations in inorganic chemistry? |
In a closed, constant temperature container, reaction $\ce{A(s)<=>B +C(g)}$ reached chemical equilibrium. If the volume of the container is reduced, when the equlibrium is reached again, the concentration of $\ce{C}$ equals the concentration of $\ce{C}$ before the reduction.
Is it possible that $\ce{B}$ is in gas s... |
I know that for a particular, immiscible solute, there is a limit on how much of it can be dissolved in a solvent at a given temperature. Howver, I was wondering if there is only so much "total solute" that a given solvent can dissolve. As a simple example, suppose you saturate water with salt, then start dissoliving s... |
Absolute limits on solubility of immiscible solutes? |
I know that for a particular, immiscible solute, there is a limit on how much of it can be dissolved in a solvent at a given temperature. Howver, I was wondering if there is only so much "total solute" that a given solvent can dissolve. As a simple example, suppose you saturate water with salt, then start dissoliving s... |
I am working on a project in my chemistry class, and even though we've already finished the lab, I'm still confused as to why and how MgCl2 melts ice/ lowers the freezing temperature of water. Can anybody tell me why this happens? |
Why does MgCl2 lower the freezing temperature, and how does it do so? |
I know that for a particular, immiscible solute, there is a limit on how much of it can be dissolved in a solvent at a given temperature. However, I was wondering if there is only so much "total solute" that a given solvent can dissolve. As a simple example, suppose you saturate water with salt, then start dissolving s... |
In a closed, constant temperature container, reaction $\ce{A(s)<=>B +C(g)}$ reached chemical equilibrium. If the volume of the container is reduced, when the equilibrium is reached again, the concentration of $\ce{C}$ equals the concentration of $\ce{C}$ before the reduction.
Is it possible that $\ce{B}$ is in gas ... |
Physical chemistry is easy to study as I have to just understand the concepts (like in physics) and apply some equations for calculations. In organic chemistry, reaction mechanisms helpsin remembering a lot of reactions and also doing conversion problems help a lot.
But, in the case of inorganic chemistry it is ver... |
In a closed, constant temperature container, reaction $\ce{A(s)<=>B +C(g)}$ reached chemical equilibrium. If the volume of the container is reduced, when the equilibrium is reached again, the concentration of $\ce{C}$ equals the concentration of $\ce{C}$ before the reduction.
Is it possible that $\ce{B}$ is in gas ... |
I am working on a project in my chemistry class, and even though we've already finished the lab, I'm still confused as to why and how $\ce{MgCl2}$ melts ice/ lowers the freezing temperature of water. Can anybody tell me why this happens? |
I am interested in Non-Stoichiometry and how it relates to crystal structures; In particular I wish to learn about surfaces of metal oxides. I am aware that point defects in such crystals are a result of an entropy driven reactions. So my question is this:
Are there any good introductory resources on this subject? I... |
As far as i know a big equilibrium constant shows that the reaction wants to get complete , $$\ce{B <=> A}$$ if A and B are gases then K is $$\frac{[A]}{[B]}$$ but when I multiply the reaction by 20 , K is $$\frac{[A]^{20}}{[B]^{20}}$$ while the same moles of B are consumed . if first K = 10 then the second K is $$10^{... |
Why does equilibrium constant change when the reaction is multiplied by a number and nothing in the real has been changed? |
As far as I know, a large equilibrium constant shows that the a reaction like the one below wants to complete:
$$\ce{B <=> A}$$
If A and B are gases, then K is:
$$K_1=\frac{[A]}{[B]}$$
but when I multiply the reaction by 20 , K is
$$K_{20}=\frac{[A]^{20}}{[B]^{20}}$$ while the same number of moles of B a... |
In my chemistry class, we had a problem akin to the following:
> If an object with mass bla and specific heat bla is placed into a bla g calorimeter with an initial temperature of bla and a specific heat of bla, and the temperature of the calorimeter rises to bla at the end of the experiment, **how much heat was los... |
Is it customary to express heat loss as a negative number? |
Say for example, the KOH molecule. I know it's a base from literature, but how would one go about determining if a molecule is acidic or basic simply based on the structure of the molecule? How about amphoteric?
Also, I understand that there are two complementary systems - Lewis and Bronsted-Lowry theories. How do t... |
How does one tell if a specific molecule is acidic or basic? |
I have some questions regarding how to read a MALDI mass spectrum in a paper. I am a biologist by training, so I would like some analytical chemists to help me out.
The researchers ran a western blot, and immunoblotted for a protein of interest. They cut out this band from the western blot, subjected the protein to ... |
How to interpret a MALDI mass spectrum? |
**Find the number of unpaired electrons present in the d orbital (whose lobes are present along the axis) for the complex $[Co(SCN)4]^{2-}$ .**
*Since SCN is a weak ligand I did not pair the electrons but still i got the wrong answer.
THE CORRECT ANSWER IS 0. But how? Please help.* |
According to the definition of ionic bond:
> An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
![enter image description here][1]
[1]: https://i.stack.imgur.com/pBN16.gif
If we consider the above figure showing formation of ion... |
Say for example, the KOH molecule. I know it's a base from literature, but how would one go about determining if a molecule is acidic or basic simply based on the structure of the molecule? How about amphoteric?
Also, I understand that there are two complementary systems - Lewis and Bronsted-Lowry theories. How do t... |
I'm aware that tritium undergoes beta decay forming Helium-3. But in the case of HTO, what does it decay into? I don't suppose it decays into HeHO. |
What does HTO decay into? |
In movies cool guys don't need a matchbox − they just light a match by scratching it on whatever hard surface − concrete walls, wooden bar tables, leather belts, etc. Is it just a movie trick, or is there actually a type of matches you can do that with?
So far I've tried scratching usual matches on a ton of differen... |
Is it possible to light a match by scratching it on hard surfaces, like they do in movies? |
> How does one tell if a specific molecule is acidic or basic?
An acid (from the Latin acidus/acēre meaning sour) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form sal... |
> How does one tell if a specific molecule is acidic or basic?
An acid (from the Latin acidus/acēre meaning sour) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form sal... |
> How does one tell if a specific molecule is acidic or basic?
An acid (from the Latin acidus/acēre meaning sour) is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals (like calcium) to form sal... |
It is sometimes challenging to determine if a molecule is going to be acidic or basic if the system in which it is reacting is not considered. An important point to consider when dealing with acids and bases is that *acid/base strength is inherently tied to the solvent*. For this answer, I'm going to limit the discus... |
Usually I have the habit of keeping the hot milk for a while, until it becomes cool. I have noticed many a times that, drinking it, after keeping for a while, gives the mixture of hot (relatively less hot than before) and cool milk.
- Almost $3$ by $4$ (approx) part of the milk at the top, is relatively found to be... |
I am working on a Master degree and need to know the following data :
* The static (low frequency) dielectric constant of isopropanol at 25 °C
* The Optical (high frequency) dielectric constant of isopropanol at 25 °C
* Dielectric relaxation time (τ) of isopropanol at 25 °C
Could someone please prov... |
Take the electrolysis of Lead(II) bromide:
We can write it as two half-reactions:
$$\ce{Pb^{2+}(l) + 2e^{-} \rightarrow Pb(l)}$$
$$\ce{Br^{-} \rightarrow Br + e^{-}}$$
In the electrolysis reaction, lead is formed at the cathode and bromine is liberated at the anode. But why is it so? I mean, before gaining ... |
During electrolysis, why are the products attracted to the cathode? |
In the Hall-Heroult process of extracting aluminium from aluminium oxide, the electrolyte is a liquid mixture of cryolite ($\ce{NaAlF_6}$) and aluminium oxide (of course). The cathodes and the anodes are made of graphite.
During the electrolysis process, aluminium is deposited at the cathode and oxygen is liberated... |
Why do they use graphite anodes in the Hall-Heroult process? |
Also,
Explain why oxygen forms a double bond in O2 but sulfur, also from group 16, forms single bonds in S8?
Thanks! |
Explain why Sulfuric acid can be reduced but not oxidised? |
You have to think about what exactly a cathode and anode are. You are falling victim to this:
*A widespread misconception is that anode polarity is always positive (+). This is often incorrectly inferred from the correct fact that in all electrochemical devices, negatively charged anions move towards the anode and ... |
Also,
Explain why oxygen forms a double bond in $O_2$ but sulfur, also from group 16, forms single bonds in $S_8$?
|
Why does oxygen form a double bond in $O_2$ but sulfur, also from group 16, forms single bonds in $S_8$?
|
During the [electrolytic purification of copper][1], the electrolyte is taken as copper(II) sulphate ($\ce{CuSO_4}$). Is there any particular reason for this? Could another salt of copper, say $\ce{CuCl_2}$ work?
I mean, I don't see any reason why it shouldn't. The only difference will be, that at the anode chlorine... |
Why is $\ce{CuSO_4}$ used as electrolyte while purifying copper? |
> Larger the difference in electronegativities of bonded atoms, the larger the dipole moment. [this statement has been extracted from chemwiki-[dipole moment](http://chemwiki.ucdavis.edu/Physical_Chemistry/Quantum_Mechanics/Atomic_Theory/Intermolecular_Forces/Dipole_moments)]
The electronegativity difference b... |
Why do C-F bond has less dipole moment than C-Cl bond? |
What method did John Dalton use to measure the mass of one mole of gases for example chlorine and hydrogen to get their relative mass? |
I know that the VSEPR theory explains $IF_7$ (iodine heptafluoride)'s structure as a trigonal bipyramidal one.The valence bond theory can be used to say that it has $sp^3d^3$ hybridisation(i think so).How can the bonding in it be explained using the LCAO(Linear Combination of atomic orbitals)method in molecular orbital... |
How can the Bonding in IF7 be explained using LCAO method? |
What method did John Dalton use to measure the mass of one mole of gases, for example, chlorine and hydrogen, to get their relative masses? |
This may be useful to you: [Google Book Search][1]
[1]: http://books.google.com/books?id=fIo-AAAAYAAJ&pg=PA26&lpg=PA26&dq=On%20the%20Absorption%20of%20Gases%20by%20Water%20and%20Other%20Liquids,%20John%20Dalton&source=bl&ots=8RTWb6v64Z&sig=VvRZBfCa0txIFgyKoOgKkoAOB9c&hl=en&sa=X&ei=j-h3UqqqGqnXygHbioCgAw&ved=0CFM... |
The concept of a [mole][1](c. 1805), and [Avogadro's number][2](1811) occurred after Dalton formulated his [law][3] (1801). So he would not have set out to measure a "mole of gas" as the modern formulation sets out. This history of Dalton may be useful to you: [Google Book Search][4] Most of his work centered around pr... |
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