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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 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 ...
Clinfosfito's user avatar
2 votes
0 answers
89 views

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 ...
HiddenBabel's user avatar
5 votes
2 answers
324 views

Using potassium dichromate and sulfuric acid to clean test tubes after Tollens’ test

We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean the ...
Harikrishnan M's user avatar
6 votes
1 answer
506 views

"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 (...
TheSimpliFire's user avatar
-2 votes
3 answers
286 views

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 ...
Maddy's user avatar
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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....
Cuckoo Beats's user avatar
1 vote
2 answers
92 views

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 ...
Val's user avatar
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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 ...
SHADOW LEGEND's user avatar
2 votes
0 answers
53 views

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(...
Thomas Pluck's user avatar
-3 votes
1 answer
106 views

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$...
youthdoo's user avatar
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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 ...
Sudarshan Kulkarni's user avatar
2 votes
0 answers
79 views

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, ...
AdamT's user avatar
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2 answers
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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 ...
crvenikupus's user avatar
-2 votes
1 answer
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Colour of coordination compounds due to d-d transition

Hexaaquanickel(II) is green but tetracyanidonickelate(II) is colourless. On internet I found two explanations. One used valence bond theory that claimed there is no excitation of electron in ...
Harjot Dhillon's user avatar
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1 answer
132 views

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, ...
Freeby Freeby's user avatar
8 votes
2 answers
516 views

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 ...
AdamT's user avatar
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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 ...
Quimbinator's user avatar
1 vote
1 answer
167 views

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 ...
kamikaze's user avatar
3 votes
1 answer
320 views

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 ...
Mäßige's user avatar
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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?
user138995's user avatar
1 vote
0 answers
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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 $\ce{MoS2 +N^- -> MoSN + S^-}$. ...
Daniel's user avatar
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-1 votes
1 answer
125 views

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?
Iyah's user avatar
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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 ...
Viliam Philippe Frano's user avatar
-4 votes
2 answers
59 views

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 ...
Gabriel Rocha Furtado's user avatar
0 votes
0 answers
40 views

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 ...
Hecron's user avatar
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1 vote
1 answer
223 views

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 ...
Mäßige's user avatar
  • 117
0 votes
2 answers
124 views

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-...
Mäßige's user avatar
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-2 votes
1 answer
47 views

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 ...
N N-DiEthyl Benzamide's user avatar
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1 answer
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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 ...
Zane Stockton's user avatar
-3 votes
1 answer
40 views

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 ...
Mathipulator's user avatar
0 votes
0 answers
77 views

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 ...
Mäßige's user avatar
  • 117
2 votes
0 answers
88 views

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 ...
Mimi's user avatar
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-2 votes
1 answer
75 views

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 ...
Ahmad Raza Beg's user avatar
1 vote
0 answers
73 views

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, ...
Shaun Ross's user avatar
0 votes
1 answer
70 views

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 ...
tantan's user avatar
  • 9
2 votes
1 answer
98 views

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?
crisps's user avatar
  • 107
2 votes
0 answers
83 views

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 $\...
Razz's user avatar
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0 votes
0 answers
95 views

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 + ...
thundercrypt's user avatar
4 votes
0 answers
41 views

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) ...
bukwyrm's user avatar
  • 186
4 votes
2 answers
679 views

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 ...
Alex Wang's user avatar
1 vote
1 answer
178 views

Redox titrations : Oxidation of metallic Iron by Potassium Dichromate

$\pu{0.31 g}$ of an alloy of $\ce{Fe + Cu}$ was dissolved in excess of diluted $\ce{H2SO4}$, and the solution was made up to $\pu{100 ml}$. $\pu{20 ml}$ of this solution required $\pu{3 ml}$ of $\frac{...
Ahmad Raza Beg's user avatar
1 vote
1 answer
88 views

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 ...
Tima's user avatar
  • 11
1 vote
0 answers
149 views

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 ...
Razz's user avatar
  • 137
-1 votes
1 answer
332 views

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....
Gnanadeep Sai's user avatar
1 vote
0 answers
52 views

Recovery of antimony trichloride

I have bought 250 g of old antimony trichloride bottle (very cheap), it was never opened because it is sealed from manufacturer. But it was probably not stored well, or seal is not good, because there ...
Tom's user avatar
  • 33
-1 votes
1 answer
61 views

Reactivity in my standard solution of Cu, P, Al, Ca, Fe, K, Mg, Mn, Na and S in 7,8% HNO3 and H2O2

I have a problem with my standard for ICP-OES. It contains the following elements Cu, P, Al, Ca, Fe, K, Mg, Mn, Na and S in a solution of 7,8% HNO3 and H2O2. I cannot make it work for reading P and ...
Mette's user avatar
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0 votes
0 answers
46 views

Bromate ion point group?

Would the bromate ion have C3v point group due to the trigonal pyramidal geometry? I see a C3 rotational axis and a vertical plane of symmetry. Am I missing anything in terms of the double bonds or ...
crisps's user avatar
  • 107
1 vote
1 answer
174 views

If diborane has 3c-2e bonds, then why are both boron atoms still electron deficit?

This is an image of the structure of diborane. It has a 3-center-2-electron bridge bond. As we can see in the bridge bond, the electron in the hydrogen atom and one electron in either boron atom is ...
Bongo Man's user avatar
  • 369
0 votes
1 answer
115 views

Correct structure of compound tetraiodine nonoxide [duplicate]

I have a confusion about the correct structure of tetraiodine nonoxide. I came to know about it while reading the equation : $$\ce{6 I2 (dry) + 11 O3 -> 3I4O9 + 3O2 }$$ Now again I saw the equation ...
Prince Nagar's user avatar
0 votes
0 answers
26 views

What's the reason of curvature in Tanabe-Sugano diagrams?

Analysing Tanabe-Sugano diagrams it's evident that some of the lines are pretty parallels to that of the ground field whilst others are inclinated or have some curvature. I know what's the effect on ...
Chemistry.'s user avatar

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