Questions tagged [inorganic-chemistry]
Inorganic compounds generally do not have C-H bonds, while organic compounds do have such bonds. The distinction between inorganic and organic chemistry, however, is far from absolute.
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Why don't some elements have standard reduction potential?
I tried searching for ge SRP value of Sc 3+ to Sc 2+ but couldn't find anything. It's not mentioned in my text book either. All I can find is that it's 'very low'
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Products formed on reaction of aqueous solution of iron(III) nitrate nonahydrate
Crystalline iron(III) nitrate nonahydrate, Fe(NO3)3.9H2O, has a very pale violet color. When added to water, the crystals dissolve to form a brown solution. Treatment of this brown solution with ...
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Reaction kinetics exercise for hydrogen iodide synthesis
The rate constant for the reaction of hydrogen with iodine is $\pu{2.45E-4 M-1 s-1}$ at 302 °C and $\pu{0.905 M-1 s-1}$ at 508 °C.
a. calculate the activation energy and Arrhenius preexponential ...
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Iodine solution concentration
I am planning to make 1L of 0.005M iodine solution from KI and I2. I have found instructions that say to use 2 g of KI and 1.3 g of I2 but no explanation why exactly this particular amount. I also ...
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Why potassium carbonate breaks glass when heated? [closed]
I have been studying about desiccants for a while and testing some inorganic salts, including calcium chloride, sodium sulfate and potassium carbonate. When they get enough moisture from air, I ...
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What is the ionic conductivity of the hydroperoxide ion?
Hydrogen peroxide is supposed to dissociate as
$$\ce{H2O2 <=> H+ + HO2-}$$
But I can't find a source for the conductivity, $\lambda$, of the hydroperoxide anion $(\ce{OOH-}$ or $\ce{HO2-})$ on ...
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Ammonia floor cleaners [closed]
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Can I use an Ammonia based floor cleaner on floors that were previously washed with Bleach? will that produce a reaction that will lead to Chloramine gas or does that only happen if the 2 liquids ...
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Electronegativity of Compounds [closed]
I know about electronegativity of elements (like fluorine is 4) but then I heard that electronegativity of compounds (molecules like $\ce{-NO2}$, $\ce{-OH}$ etc) also exists (I heard this from the ...
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Why formal charges aren't real?
Suppose we have (CO3)2- structure, here we have one oxygen atom doubly bonded to carbon and the other two are singly bonded. In order to have complete octet , the singly bonded oxygen atoms must have ...
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"Fireblob" in KO₂ and PCl₅ reaction
The reaction between $\ce{KO2(s)}$ and $\ce{PCl5(s)}$ leads to the strange formation of a black "fireblob" which eventually turns orange.
This is demonstrated in this YouTube video (...
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What determines how alkali an element is and why does the alkalinity increases down group 2? [duplicate]
I am currently doing high school chemistry and I am currently studying elements in group 2. I am not quite sure why further down group 2, the element becomes more alkaline thus more soluble. I would ...
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Structure of AgNO2 and AgONO [closed]
We had a discussion in class today about the substitution reaction of RX with AgNO2 and KNO2. Pretty unimportant, since those seem just fine. But there were 2 arguments.
The root problem was, that we ...
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Why do most sulphate salts have water of crystallization in them?
I mean looking at most of the sulphate salts (there are so many but just to name some Epsom salt, blue vitirol, gypsum...) they have some amount of water crystallized within them (Epsom salt is MgSO4....
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NaCl Unit Cell - Chloride Ions on the edges or corners?
When I search online for an NaCl unit cell I often find a significant number of images, such as the one I have attached to this post, showing the chloride ions in the "edge" and "body ...
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why are there no pictures or experiments on solid ozone?
wikipedia states that solid ozone is violet black in colur and so is my textbook, but when you search up for solid ozones, there are no pictures or experiments done in youtube. Was the colour or the ...
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High-temperature interactions with salts on nichrome wire
I'm working on creating aluminium-doped zinc oxide (AZO) thin films, but instead of the usual glass substrate, I want to try this on a fine nichrome wire.
I'm using a mix of zinc acetate $\ce{Zn(...
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Which of the following might turn NaNO2 into N2? [closed]
Which of the following might turn $\ce{NaNO2}$ into $\ce{N2}$?
A. $\ce{NaCl}$ B. $\ce{NH4Cl}$ C. $\ce{HNO3}$ D. $\ce{H2SO4}$
The answer is B and we have
$$\ce{NH4Cl + NaNO2 = NaCl + 2H2O + N2↑}.\tag1$...
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Does CsBr have BCC lattice or cubic?
Everywhere I see on the internet, it says BCC, but my professor still says "it is cubic lattice, no matter which book/website might tell you otherwise".
The argument was that for deciding ...
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How do two orbitals need the same symmetry to bond? Do they need the same mulliken label?
I heard that in order for two atomic orbitals to form a bonding molecular orbital, they need:
Similar energy
Similar symmetry
and Possibility of overlap with the same sign
but, for example in methane, ...
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Calculating the pH after adding hydrochloric acid to the potassium hydrogen phosphate solution
I am trying to calculate the $\mathrm{pH}$ of a solution obtained by mixing $\pu{20.00 mL}$ of $\pu{0.2 M}$ potassium hydrogen phosphate solution and $\pu{10.00 mL}$ of $\pu{0.25 M}$ hydrochloric acid ...
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Non-octet structures of stable nitrogen compounds
A question in my exercise book demonstrates that nitrogen cannot form non-octet structures since the most common examples — nitrogen dioxide and nitrogen monoxide — are unstable/reactive. For example, ...
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Mulliken Labels: How do I tell apart E, doubly degenerate, symmetry apart from T, triply degenerate, symmetry for a molecular orbital?
With A and B, it's pretty simple. If you rotate the molecule about its principle axis to where the orbitals line up, and the signs change, it's Mulliken label has a B. otherwise, it's A.
I heard E ...
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Why is there a yellow solution formed upon reaction of silicon tetrachloride with water?
I've read somewhere that reacting the two will give a white solid and a yellow solution. I'm assuming the white solid is the silicon dioxide, but what is the chemical origins of the yellow colour of ...
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Calcium oxide in self-heating packs [closed]
I've read some articles on the internet about self-heating meals. Heat released from an exothermic reaction is used to heat up the food. In fact, several reactions are recommended for this purpose ...
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How to properly determine number of vibrational modes of CO in carbonyl complexes?
it's been a few years since I took inorganic chemistry and was starting to refresh some of the concepts. What I didn't really understood when I reread was the following: How to properly determine the ...
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How is the central atom in SNF3, Nitrogen? [closed]
Shouldn't it be Sulphur as it is larger and has ability to make more bonds due to its 6 valence electrons?
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Can someone help with GAMESS input files for heavy atom calculations (MoS2, WS2, etc.)?
I'm doing computational research on transition metal dichalcogenides for my chemistry class and I want to calculate a transition state optimization for the reaction $\ce{MoS2 +N^- -> MoSN + S^-}$. ...
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Na+ as an electrophile [closed]
In inorganic I learnt that s block cations are lewis acids but while learning attacking reagents in organic chemistry I came across the fact that Alkali metals are not electrophiles, why so?
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When relaxing the strong field interaction, the (t2g)^2 configuration splits into 4 states. What is the symbolic configuration of the Eg state?
When relaxing the infinitely strong field, the electrons start to feel one another's presence. They will, therefore, give rise to sets of states such as T1g, T2g... for the (t2g)^2 initial ...
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Why doesn't breaking hydrogen bridges in water increase the temperature?
Why, when hydrogen bridges are broken in water as during a phase transition, the input energy does not increase the temperature? Is it because some part of the energy is converted into a rotational ...
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Hybridization and lone pairs
I understand how hybridization works but have trouble understanding it conceptually. I understand that for bonds to form, the electrons must be in orbitals with equivalent energy, but why does this ...
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Band structure of solids in general
As my last question (Semiconductors and their electronic bands) was badly structured, I decided to elaborate my questions a bit.
As I now know, every solid/liquid forms a band structure, so all ...
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Semiconductors and their electronic bands [closed]
While studying colors of sulfides and searching for the reason why they are black I came across this question:
https://chemistry.stackexchange.com/questions/138309/the-color-of-the-most-sulfides-of-p-...
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Can I make orthophosphoric acid from sodium dihydrogen phosphate and an acid which I can use to make ethyl iodide?
For my project I needed to di-substitute benzamide with ethyl group at N position to create DEB as a mosquito repellent. The first part of creating benzamide I was able to do, but the second part of ...
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Where does the ionisation energy for a reaction to take place comes from? [closed]
Can anyone tell me exactly what happens during a chemical reaction in terms of ionisation energy? I know that during a reaction there is an exchange of electrons (except for those where electrons are ...
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Choosing energy levels for finding quantum numbers
When an element has multiple energy levels (i.e Titanium has $(Ar)3d^24s^2$), what energy level do we use to find the quantum numbers? Is it generally assumed the LAST energy level is used? or is it ...
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Apparent color of nickel(II)chloride and nickel(II)chloride hexahydrate
Why does anhydrous nickel chloride (NiCl2) appear yellow, even though chloride ions are considered weak field ligands, which should result in a smaller ligand field splitting energy and the absorption ...
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Why is silver(I) oxide sensitive to a long period exposure to the light?
I will do a reaction where I will use silver oxide as a catalyst (Lewis acid) that will help me to do a nucleophilic substitution. I read that it is photosensitive but I could not find the reason why ...
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Bond length in square planar coordination complex of Platinum
(Q): Select the correct statements for $[Pt(NH_3)_2Cl_2]$ :
(a): Geometrical Isomerism
(b): Optical Isomerism
(c): All bond length are equal.
(d): Chelation effect is effect.
(e): Hydrogen bonding is ...
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Under what conditions does ferric phosphate precipitate from solution?
I would like to know the conditions which cause ferric phosphate to precipitate from solution.
I am trying to culture iron bacteria, for which the culture media contain ferric citrate and phosphates, ...
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Why does hypophosphorous acid oxidation occur in acidic media?
When one mole of $\ce{H3PO2}$ is treated with excess $\ce{I2}$ in acidic solution, one mole of $\ce{I2}$ is reduced; on making the solution alkaline, a second mole of $\ce{I2}$ is consumed.
I am ...
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How do you determine point groups of more complex molecules when there are 2 or more central atoms?
I am trying to determine the point group of Fe2(CO)8 and am having difficulty with the bond angles and geometry. How would one go about this in a logical sense?
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Isomers of Pentaaminechlorocobalt(III) chloride
What kind of isomers does $\ce{[Co(NH3)5Cl]Cl2}$ exhibit?
I can rule out geometrical and optical due to there being $\ce{5 NH3}$ ligands which central metal atom cannot have different positions of $\...
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In which medium is Potassium Permanganate a better oxidising agent?
I was in chemistry class just now, and my chemistry teacher gave us three reactions:
Reaction 1: $\ce{MnO4^- + e- -> + MnO4^2- (basic medium)}$
Reaction 2: $\ce{MnO4^- + 4H+ + 3e- -> + MnO2 + ...
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Are there tenebrescent minerals like KCl, but ideally resettable with UV/IR?
Is there a ‘simple’ mineral that is tenebrescent (getting reversibly darker on irradiation), but is resettable with UV or IR?
Hackmanite, spodumene and tugtupite (Wikipedia examples for tenebrescence) ...
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Can “hydrates” of crystals form with other molecules?
It is well known that copper sulfate, sodium sulfate, et al crystallize with 5,10 water molecules of hydration, locked in their crystal lattices. Is it possible to have other molecules instead of ...
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Redox titrations : Oxidation of metallic Iron by Potassium Dichromate
0.31 g of an alloy of Fe + Cu was dissolved in excess of dilute $\ce{H2SO4}$ and the solution was made upto 100 ml. 20 ml of this solution required 3 ml of $\frac{N}{10} \ce{K2Cr2}\ce{O7}$ solution ...
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The separation of lanthanum oxide and chromium oxide
I have encountered a problem. How can I separate the alloy of lanthanum oxide and chromium oxide? I attempted to dissolve them in concentrated sulfuric acid with heating, but it didn't work. If I had ...
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Color of coordination compounds
My book(Page $259$ section $9.5.5$) says that the color mainly comes from absorption of light in the coordination compound:
The color is complementary of the wavelength it absorbs , the wavelength ...
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Reason behind paramagnetic substances having color
I've read in many books that paramagnetic substances are coloured while diamagnetic substances are colourless (yes there are some exceptions too). But nowhere i could find a reason for this phenomenon....
