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I have a bottle of anhydrous $\ce{FeCl2}$ powder and want to make this into a solution. I work in a glovebox, but what I have done prior is that I prepared the reagents outside of the glovebox and then put them inside. I let nitrogen gas bubble through water and then add this water to a certain amount of the anhydrous ... |
What chemical reaction happens on worn out metal handles? |
I have a bottle of anhydrous $\ce{FeCl2}$ powder (from [here][1]; it is 98% pure and was kept in a glovebox after opening it for the first time to minimize reactions with oxygen) and want to make this into a solution. I work in a glovebox, but what I have done prior is that I prepared the reagents outside of the gloveb... |
I have a bottle of anhydrous $\ce{FeCl2}$ powder (from [here][1]; it is 98% pure and was kept in a glovebox after opening it for the first time to minimize reactions with oxygen) and want to make this into a solution. I work in a glovebox, but what I have done prior is that I prepared the reagents outside of the gloveb... |
There are so many structures here that it is at times difficult to keep things straight. The best way to approach your question is to take advantage of what is known about oxymercuration. If you enter "oxymercuration" at Search on Chemistry at the top of the page you will find a wealth of information at your disposal r... |
Suppose that a system whose initial state is Pressure = $P_1$, Volume = $V_1$; and it is taken through a process after which final pressure and volume are $P_2$ and $V_2$ respectively. Now change in enthalpy is defined as <br>$\Delta H= \Delta U +P\Delta V+V\Delta P$<br>The thing which I am confused with is which press... |
Why is the change in enthalpy computation for a change of state done like this? |
I am wondering why mathane is burned to CO$_2$ for isotopic analysis, e.g with a mass spec?
I have looked into several text books, they all describe how to do it but not why.
Is it because of a interference on mass 16? Analysing methane it it is would give you also information about the D/H ratio. So why? |
My over 30 years old laminate kitchen countertop had accumulated a lot of marks over the years that no cleaner would remove. I finally gave up and decided to use chlorine bleach on it knowing that the bleach may damage it. The bleach removed all the marks — looked like new.
There is only one unfortunate side effec... |
I was researching for a question that asked me to find a ratio of temperatures, and I came across this, which would help me greatly: [![enter image description here][1]][1]
[1]: https://i.stack.imgur.com/VA8GJ.png
But, I don't understand why due tho these factors equation 7 is true, is there any clarificati... |
I was researching for a question that asked me to find a ratio of temperatures, and I came across this, which would help me greatly:
Since, most of the temperature changes occur during the isochoric (2–3) and isobaric processes (4–1), a constant specific heat can be assumed during the isentropic processes (1–2 and 3... |
Let $H$ be the Hamiltonian of a specific atom and $J$ the total angular momentum. Since $H$ and $J$ commute, they have common eigenstate.
So we can label the atomic states by their energy and total angular momentum $\phi_E^J$.
My question is, suppose we have a state $\phi_E^J$ and another state $\phi_{E'}^{J'}$, do... |
Do different eigenstates of total angular momentum have necessarily different energies? |
There are so many structures here that it is at times difficult to keep things straight. The best way to approach your question is to take advantage of what is known about oxymercuration. If you enter "oxymercuration" at Search on Chemistry at the top of the page you will find a wealth of information at your disposal r... |
All what Karl and Poutnik are saying is right. But the real question is : Why ? Why is $\ce{NH3}$ more reluctant to loose one proton than $\ce{H2O}$, at the atomic level ? Why is $\ce{NH2^-}$ such a strong base ?
Let's compare this behaviour in the series $\ce{N-O-F}$. Starting with $\ce{F}$, we can observe that $\... |
I was going through the concept of Boiling to reduce the potassium in Potatoes, which means (potato) + (water+heat) -> potassium + x. X is potato with reduced potassium. I am more interested in the composition of Potato, which I found to be close to starch (C6H10O5)n. Then I started wondering how the Potassium is pres... |
How is Potassium present in Potato (form) and where does it come from originally? |
>[![enter image description here][1]][1]
What is the product of the reaction above?
The options in which I have the doubt are:
**(A)** [![enter image description here][2]][2]
or **(B)** [![enter image description here][3]][3]
[1]: https://i.stack.imgur.com/9fKgJ.png
[2]: https://i.stack.imgur.co... |
How to decide the stereochemistry of this product? |
I was going through the concept of Boiling to reduce the potassium in Potatoes, which means $\ce{potato + water +heat -> potassium + X}$. $\ce{X}$ is potato with reduced potassium. I am more interested in the composition of Potato, which I found to be close to starch $\ce{(C6H10O5)n}$. Then I started wondering how the... |
Will it go inside the plane or come outside the plane? |
>[![Question][1]][1]
>
> What is the product of the reaction above?
The options in which I have the doubt are:
**(A)** [![Option A][2]][2]
or **(B)** [![Option B][3]][3]
So how do we decide whether that $\ce{CH_2-I}$ group will come outside the plane or go inside the plane?
The answer given is the one ... |
All what Karl and Poutnik are saying is right. But the real question is : Why ? Why is $\ce{NH3}$ more reluctant to loose one proton than $\ce{H2O}$, at the atomic level ? Why is $\ce{NH2^-}$ such a strong base ?
Let's compare this behaviour in the series $\ce{N-O-F}$. Starting with $\ce{F}$, we can observe that $\... |
All what Karl and Poutnik are saying is right. But the real question is : Why ? Why is $\ce{NH3}$ more reluctant to loose one proton than $\ce{H2O}$, at the atomic level ? Why is $\ce{NH2^-}$ such a strong base ?
Let's compare this behaviour in the series $\ce{N-O-F}$. Starting with $\ce{F}$, we can observe that $\... |
I'm being taught that the kind of bonds that exist between elements depends on the electronegativity difference between the elements. A difference less than 1.7 is covalent and a difference higher than 1.7 is ionic.
Separately, I've been taught that bonds between metals and non-metals are ionic. What happens when th... |
What kind of bond exists between a metal and a non-metal with a difference in electronegativity of less than 1.7? |
I'm wondering what does " Derive the Rate law for A+B -> C -> P when A+B -> C is the slowest step and very slow." mean? My understanding is A+B -> C is the rate-determining step, so the rate law would just be: rate = k[A][B]. I'm not sure if the question is asking about Steady-State Approximation or just a simple rate ... |
A decrease in pH increases the hydrogen ion concentration, thereby decreasing Q, and decreasing gibbs free energy as mathematically expressed: dG= dG + RTlnQ
This means that the more acidic the environment is, the more spontaneous the reaction is. But don't biochemical processes operate at approximately neutral pH ... |
How does pH affect the spontaneity of biochemical processes? |
A decrease in $\mathrm{pH}$ increases the hydrogen ion concentration, thereby decreasing $Q,$ and decreasing Gibbs free energy as mathematically expressed:
$$\mathrm dG =\mathrm dG^\circ + RT\ln Q$$
This means that the more acidic the environment is, the more spontaneous the reaction is. But don't biochemical pr... |
Often times I see alloys described like [this][1],
> Lockalloy is an alloy that consists of 62% beryllium and 38% aluminum
Are the precentages mentioned here in weight percent or atom percent? Is there a standard somewhere that governs this notation? I don't see this mentioned anywhere in the literature, how do... |
Problem:
For the reaction below, Keq = 0.0064 (at 825C). If you place 12.011 g Carbon and 5 atm pressure of water vapour in a 2.0 L reaction flask, calculate the pressure of carbon dioxide gas that will be present once the reaction comes to equilibrium.
C(s) + 2 H2O(g) ↔ CO2(g) + 2 H2(g)
Here is what I h... |
How do I find the pressure that would be present in carbon dioxide for this problem? |
Problem:
For the reaction below, Keq = 0.0064 (at 825C). If you place 12.011 g Carbon and 5 atm pressure of water vapour in a 2.0 L reaction flask, calculate the pressure of carbon dioxide gas that will be present once the reaction comes to equilibrium.
C(s) + 2 H2O(g) ↔ CO2(g) + 2 H2(g)
Here is what I h... |
Problem:
For the reaction below, Keq = 0.0064 (at 825C). If you place 12.011 g Carbon and 5 atm pressure of water vapour in a 2.0 L reaction flask, calculate the pressure of carbon dioxide gas that will be present once the reaction comes to equilibrium.
C(s) + 2 H2O(g) ↔ CO2(g) + 2 H2(g)
Here is what I h... |
Does anyone have access to the aqueous solubility value of Aluminum Monoacetate*?
I would expect it to be slightly soluble but I've searched the internet and haven't found any solubility values. : /
____________________________
*https://en.wikipedia.org/wiki/Aluminium_monoacetate?wprov=sfti1
|
Aluminum Monoacetate Solubility is Aqueous Medium? |
Does anyone have access to the aqueous solubility value of so-called [aluminum monoacetate][1]?
I would expect it to be slightly soluble but I've searched the internet and haven't found any solubility values. : /
____________________________
[1]:https://en.wikipedia.org/wiki/Aluminium_monoacetate/
|
Does anyone have access to the aqueous solubility value of [aluminum monoacetate][1]?
I would expect it to be slightly soluble but I've searched the internet and haven't found any solubility values. : /
____________________________
[1]: https://en.wikipedia.org/wiki/Aluminium_monoacetate
|
Aluminum Monoacetate Solubility in Aqueous Medium? |
Why is boron inert to acids and bases? |
It is clear that the hydroxy group in the substrate gets oxidised to carboxylic acid. But what happens to the double/triple bond in the unsaturated primary alcohol when it reacts with acidic potassium dichromate? |
What happens when unsaturated primary alcohol is reacted with acidic potassium dichromate? |
According to [this website][1], storing a LiPo battery/cell (https://en.wikipedia.org/wiki/Lithium_polymer_battery) at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% capacity. The author also stated that "it is best to store LiPo batteries at 3.6 V t... |
What is the optimal voltage for storing a 3.7V LiPo battery? |
I want to conduct a quantitative analysis on my acid etching solution for my Aluminum pre-treatment process. The easiest way for me to conduct my quantitative analysis of Al is through complexometric titration with EDTA and back-titration with standardized Zinc solution.
My problem is that there's also Chromium ions... |
How can I mask the Chromium (III) and Chromium (VI) ions in my solution? |
I am using XSteam IF97 to evaluate steam power plant cycles.
However, I miss some important input options such as pressure as a function of entropy and temperature ("p_st()") - when I assume isobaric heat addition (neglecting pressure any pressure losses) while reheating the steam. I end up looking at i-s diagram wh... |
Does anyone have any experience using one-piece short distillation setups similar to this: https://www.hornik.eu.com/en/3-985_distillation-bridges/8216-distilling-link-for-short-path-distillation-duran-cones-ns1423-socket-ns1423.html?
I've been struggling with a tricky distillation recently and was wondering whether... |
One-piece short distillation glassware - worth it? |
The $\pu{3.6-3.8 V}$ range is good general choice, but may be battery specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as charge/cap... |
The $\pu{3.6-3.8 V}$ range is good general choice, but may be battery specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as charge/cap... |
A decrease in $\mathrm{pH}$ increases the hydrogen ion concentration, thereby decreasing $Q,$ and decreasing Gibbs free energy as mathematically expressed:
$$\mathrm dG =\mathrm dG^\circ + RT\ln Q$$
This means that the more acidic the environment is, the more spontaneous the reaction is. But don't biochemical pr... |
The $\pu{3.6-3.8 V}$ range is good general choice, but may be battery specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as charge/cap... |
Are the chemicals Fe(OH)3 and Fe2O3⋅3H2O equivalent? |
Is iron(iii) hydroxide equivalent to hydrated iron(iii) oxide? |
The $\pu{3.6-3.8 V}$ range is good general choice, but may be battery specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as charge/cap... |
The $\pu{3.6-3.8 V}$ range is good general choice, but may be battery specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as charge/cap... |
Are the chemicals $\ce{Fe(OH)3}$ and $\ce{Fe2O3⋅3H2O}$ equivalent? They are both network solids and have the same empirical formula but I know that doesn't always mean they are structurally the same. |
> <img src="https://i.stack.imgur.com/SfV1C.png" height="130" alt="Iodolactonisation of tert-butyl octa-1,7-dien-4-yl carbonate">
>
> What is the product of the reaction above?
I am mainly confused between the following two options:
<img src="https://i.stack.imgur.com/d3nAA.png" height="160" alt="Possible answe... |
My reasoning:
My understanding is in first step the alcohol’s O- does an Sn2 attack on the OTs containing carbon. In the second step I am confused where does the reaction happen in the triple bond or at the O-C-O Carbon?
 |
According to [this website][1], storing a LiPo battery/cell (https://en.wikipedia.org/wiki/Lithium_polymer_battery) at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% capacity. The author also stated that "it is best to store LiPo batteries at 3.6 V t... |
According to [this website][1], storing a LiPo battery/cell (https://en.wikipedia.org/wiki/Lithium_polymer_battery) at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% capacity. The author also stated that "it is best to store LiPo batteries at 3.6 V t... |
The $\pu{3.6-3.8 V}$ range is good general choice, but may be battery specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as charge/cap... |
According to [this website][1], storing a LiPo battery/cell (https://en.wikipedia.org/wiki/Lithium_polymer_battery) at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% capacity. The author also stated that "it is best to store LiPo batteries at 3.6 V t... |
Reduction of Benzamide in acidic conditions? |
According to [this website][1], storing a [lithium polymer (LiPo) battery][2]/cell at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% capacity. The author also stated that "it is best to store LiPo batteries at 3.6 V to 3.8 V. This is applicable for s... |
What is the optimal voltage for storing a 3.7 V lithium polymer battery? |
I'm looking in a textbook at an asphaltene molecule.
[![enter image description here][1]][1]
The two aromatic rings next to the Nitrogen are shaded. What does that mean? I think the Nitrogen's create delocalized electrons in this configuration, so maybe the shaded circle is the range over which that free radical ... |
What does a filled, solid circle mean in a chemical structure? |
What makes the enthalpy of hydration of calcium chloride dihydrate unique? |
The $\pu{3.6-3.8 V}$ range is a good general choice, but it may be battery-specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due to cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as ch... |
The $\pu{3.6-3.8 V}$ range is a good general choice, but it may be battery-specific. The particular voltage for 40% charge may differ for different cell technologies, e.g. various deviations of electrode materials and due to cell aging.
The optimal storage conditions, as you mentioned, are more often expressed as ch... |
I reasearched about the history of the discovery of neutrons and couldn't find who found out that isotopes are a change in the number of neutrons. Can you please tell me who it was that made this discovery? |
Who figured out that isotopes have different neutrons? |
I am working on setting up an ICE table for adding 0.020 mol HCl to 1.0 L of 0.10 M propanoic acid. Since these are both acids (propanoic acid being the weaker one and HCl being strong), how would I set this up in an ICE table to calculate the pH of the resulting acid? |
I am working on setting up an ICE table for adding 0.020 mol HCl to 1.0 L of 0.10 M propanoic acid. Since these are both acids (propanoic acid being the weaker one and HCl being strong), how would I set this up in an ICE table to calculate the pH of the resulting acid?
Edit: I was able to find an answer by taking t... |
If you mix sugar Crystal in a glass of water and mix it well, the level of water will not rise.The reason they say is that matter have spaces between them.If matter have spaces between them , How come that empty space is not visible to our eyes.If I look at a glass of water , I see all the molecules mixed up well.Not ... |
Why does matter have spaces between them? |
I can't recognize the Raman spectrum of this plastic.
[![enter image description here][1]][1]
[![enter image description here][2]][2]
It's not in the common plastics raman spectrum.
[![enter image description here][3]][3]
It is plastic adaptor for connecting sediment filters. Anyone got idea or recogni... |
What plastic is this? (Raman scan) |
I asked this question way long back and with a lot more reading, I think I've come up with more specific points to answer this question.
> the most interesting part is that the wave orbitals are distinguishable (to some extent) but not the electrons ( particle itself) why is this?
- Every electron in a given ato... |
I recently stumbled upon [this][1] news,
> seawater contains 47 minerals and metals. Starting with the most
> abundant and proceeding to the least abundant, these are chloride,
> with a concentration of 18 980 parts per million (ppm) in seawater,
> sodium (10 561 ppm), magnesium (1 272 ppm), sulfur (884 ppm), cal... |
In van der Waals correction for ideal gas equation, the pressure term has a correction where concentration term is squared. I saw derivations for this and they say that the concentration is squared because the number of particles at surface and the force exerted by other particles on the particles at surface, both are ... |
Why is the concentration term in van der Waals correction for ideal gas squared? |
The heats of hydration of your salts, plus some others, can be obtained by subtracting the heat of formation of the anhydrous from the heat of formation of the hydrated salt, using the numerical values from the Handbook of Chemistry and Physics, 43rd Ed., 1961, pages 1807 - 1831. The so obtained values are rather diffe... |
Who figured out that different isotopes have different numbers of neutrons? |
I recently stumbled upon [this][1] news:
> Seawater contains 47 minerals and metals. Starting with the most abundant and proceeding to the least abundant, these are chloride, with a concentration of $\pu{18 980 ppm}$ (parts per million) in seawater, sodium ($\pu{10 561 ppm}$), magnesium ($\pu{1 272 ppm}$), sulfur $(... |
I recently stumbled upon [this][1] news:
> Seawater contains 47 minerals and metals. Starting with the most abundant and proceeding to the least abundant, these are chloride, with a concentration of $\pu{18 980 ppm}$ (parts per million) in seawater, sodium ($\pu{10 561 ppm}$), magnesium ($\pu{1 272 ppm}$), sulfur $(... |
A burning body has flames whereas a hot or warm body is just very hot. Keeping hand near a burning body makes you feel hot but not exactly near a hot body.A burning body has flames which are yellow,then blue and purple for some outside in colour.
What exactly is a burning body and how does it differ from a warmbody ? |
What is the difference between fire and warm body? |
A burning body has flames whereas a hot or warm body is just very hot. Keeping hand near a burning body makes you feel hot but not exactly near a hot body.A burning body has flames which are yellow,then blue and purple for some outside in colour.
What exactly is a burning body and how does it differ from a warm-body?
... |
A burning body has flames (Candle flame)whereas a hot or warm body (warm utensil or body being hot but doesn’t burn )is just very hot. Keeping hand near a burning body makes you feel hot but not exactly near a hot body.A burning body has flames which are yellow,then blue and purple for some outside in colour.
What exa... |
I have an object made of what I assume to be brass, i.e. an alloy of copper and zinc.
The curved parts have both a black layer and a white layer (also note the verdigris (I guess) on the left top, but this is the only spot on the whole piece) :
[![enter image description here][1]][1]
If I understand correctly, t... |
What is this white layer on brass? |
A hot or warm body stays without any change after the end of the experiment. It can be reheated over and over again. A burning body is changed into ashes at the end of the experiment. It cannot burn twice.
Edit : Answer to a comment by Robert patrick. I don't understand the following question in your comment : *How... |
The heats of hydration of your salts, plus some others, can be obtained by subtracting the heat of formation of the anhydrous from the heat of formation of the hydrated salt, using the numerical values from the Handbook of Chemistry and Physics, 43rd Ed., 1961, pages 1807 - 1831. The so obtained values are rather diffe... |
For example, a carbon bonded to a carbonyl group is the alpha carbon, and has alpha protons. Following that there are beta and gamma carbons and protons.
Is there a specific name for the proton in an aldehyde that is bonded to the carbonyl, outside of "aldehyde proton" etc? |
Surface-enhanced Raman spectroscopy or surface-enhanced Raman scattering (SERS) is a surface-sensitive technique that enhances Raman scattering by molecules adsorbed on rough metal surfaces or by nanostructures such as plasmonic-magnetic silica nanotubes.
Does this require a Raman microscope? Remember you are not sc... |
Can you do SERS without a Raman microscope? |
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