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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Count of shared oxygens between tetrahedrons in $\ce{Si3O9^{6-}}$

Question: What is the number of oxygen atoms which are shared between tetrahedrons in $\ce{Si3O9^{6-}}$? I know that silicates have the general formula, $$\ce{SiO^{z-4}_{4-z/2}}$$ where z is count ...
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Indirectly Measuring Diffusion of NO2 into Water

I am working on a data science project with the central hypothesis is that air-born pollutants can become water-born through diffusion. The example I am using as a proof of concept is $\ce{NO2}$. The ...
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Chemical change - decomposing single element? [closed]

If I had a molecule of a single element such as atmospheric oxygen O2, and I added energy to decompose it into two separate oxygen atoms (i.e. O2 + ENERGY –– 2 O ) is this a chemical or physical ...
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440 views

What is the reaction between nitric acid and fluorine?

Nitric acid, $\ce{HNO3}$, is a strong oxidising agent as well as fluorine, $\ce{F2}$. What will be the reaction when pure $\ce{F2}$ gas is bubbled through 100% pure $\ce{HNO3}$. While searching, many ...
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Why does silver stick to the glass in Tollens' test? [duplicate]

Why does it not simply form a solid powder at the bottom of the flask? Does silver also stick to the glass in other silver precipitating reactions? EDIT: My question is definitely not the same as ...
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104 views

Calculating the biological standard potential

I have an electrochemical cell with following overall reaction: $$\ce{5 Sn^4+ + 2 Mn^2+ + 8 H2O <=> 5 Sn^2+ + 2 MnO4- + 16 H+}$$ I have defined the half reactions as: $$ \begin{align} \ce{Sn^...
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77 views

Acidity order of xenon fluorides,oxides and oxofluorides [closed]

The acidity order of xenon oxides,fluorides and oxofluorides is: $\ce{XeF6 > XeO2F4 > XeO3F2 > XeO4 > XeOF4 > XeF4 > XeO2F2 > XeF3 > XeO3}$. How to justify this order? My ...
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56 views

Reaction of hydrogen peroxide with sodium carbonate [closed]

In my book the following acid base reaction is written: $$\ce{H2O2 + Na2CO3 -> Na2O2 + H2O + CO2}$$ But I found that the $\mathrm{p}K_\mathrm{a}$ value of $\ce{H2CO3}$ is less than the one for $\...
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87 views

Does sanding the oxide layer of a magnesium sample break bonds?

We all know that if we keep a piece of magnesium metal exposed in open air, an oxide layer forms on it. This layer prevents further oxidation of the bulk metal. If we then rub it with sand paper, the ...
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170 views

Why is acetate a monodentate ligand?

Why is the acetate ion considered a monodentate ligand as opposed to a bidentate ligand considering both oxygen atoms can donate their respective lone pair of electrons?
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Naming of [Pt(py)4][PtCl4]

Why is $\ce{[Pt(py)4][PtCl4]}$ called tetrakis(pyridine)platinum(II) tetrachloridoplatinate(II) and not tetrapyridineplatinum(II) tetrachloridoplatinate(II)? I thought you use tetrakis for ligands ...
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What is the state of aggregation of iodine formed during electrolysis of molten nickel(II) iodide? [closed]

Assume the electrolysis of molten $\ce{NiI2(l)}$ (inert electrodes) in a cell. The cell with a heating element is in the room; the room is at $\pu{25 °C}$ and $\pu{101.3 kPa}.$ The half-reaction for ...
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Why is anhydrous copper(II) sulfate white while the pentahydrate is blue, even though both have one unpaired electron?

We all know that $\ce{CuSO4.5H2O}$ is blue and it turns to $\ce{CuSO4}$ on heating which is white. I also learnt about coordination complexes and d–d transitions and how transition metal compounds are ...
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How to calculate mass of calcium fluoride that will dissolve in sodium fluoride solution?

The solubility product of calcium fluoride, $\ce{CaF2},$ is $\pu{1.46E-10 mol^3 dm^{-9}.}$ What mass of calcium fluoride will dissolve in $\pu{500 cm^3}$ of $\pu{0.10 mol dm^{-3}}$ sodium fluoride ...
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Why does nitrous oxide react with bases and it is still a neutral oxide? [closed]

I have studied that N2O is a neutral oxide in my textbook(recommended by the central board of secondary education INDIA(country)). on internet and in my class notes i find its balanced reaction with ...
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What is the reason for the different solubility of silver halides in ammonia?

According to my knowledge, I know that $\ce{AgCl}$ dissolves in dilute ammonia, $\ce{AgBr}$ dissolves in concentrated ammonia and $\ce{AgI}$ does not dissolve even with concentrated ammonia. What is ...
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67 views

Qualitative Analysis- Distinguishing between two ions or two salts [duplicate]

I know my question is going to be quite below the level of this site but I am 1st grade in university and I can't understand anything. I am going to give an example from the book: distinguish ...
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71 views

Structural isomers of hexaammineiron(III) hexacyanidocobaltate(III)

Find the number of structural isomers of $\ce{[Fe(NH_3)_6][Co(CN)_6]}$ This was a question solved by my teacher as follows: The $\ce{CN}$ will show linkage isomerism while $\ce{NH_3}$ and $\ce{CN}$ ...
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Decomposition of phosphine solution in water when exposed to sunlight

Quoting from my chemistry textbook: The solution of phosphine in water decomposes in presence of light giving red phosphorus and hydrogen gas. I could not find any relevant details on the Internet....
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How to identify if a material is perovskite or not?

This is more of a materials science question, but I believe many of you have referred NIST Inorganic Crystal Structure Database (ICSD) database. I am collecting a database of perovskite materials and ...
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Honey moisture and increase in temperature? [closed]

I've been interested quite lately on how moisture would be affected as the temperature increases. My experiment methodology is that I will be manipulating temperatures of the honey between 20,40,60,80 ...
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44 views

How does Aluminum react with nitric acid at different concentrations? [duplicate]

I am unable to find proper information. My book just says that conc. Nitric acid renders it passive.Could anyone please give the different reactions at different concentrations
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How the attraction takes place between a hydrogen atom and the acceptor atom in a hydrogen bond

In hydrogen bonds present in water,does the hydrogen atom attracts to the lone pair of electrons present on the oxygen atom or to its partial negative charge? If former is the case are there any ...
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What causes passivity of specific metals in conc. nitric acid?

I know that specific metals like $\ce{Pb}, \ce{Sn}$ and $\ce{Al}$ become passive in conc. nitric acid. My questions are: Why does this happen only with conc. nitric acid, and not other conc. acids? ...
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Contradictory Properties of Mercuric Cyanide [closed]

It is said that mercuric cyanide [$\ce{Hg(CN)_2}$] is water soluble and also is a non-electrolyte. How is this possible?
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Reactions of diborane, silane, methane, aluminium, boron, sodium, phosphorus trichloride, white phosphorus and iron with water at RT [closed]

How many of the following will evolve $\ce{H2}$ gas when dissolved in water under room conditions? $\ce{B2H6},$ $\ce{SiH4},$ $\ce{CH4},$ $\ce{Al},$ $\ce{B},$ $\ce{Na},$ $\ce{PCl3},$ $\ce{P(white)},$ $\...
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798 views

Oxidation states of boron

I have just been looking at https://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements and found that boron has a -5 oxidation state. I would like to know which boron compounds form ...
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742 views

What is the @ symbol used for in material science?

I came across the phrase "Silicone Rubber/Paraffin@Silicon Dioxide" also written as $\ce{SR/pa@SiO2}$, utilising the @ symbol. How can I understand what this means?...
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What causes the blackening of light bulbs

in 1878, Thomas Edison (or rather William Joseph Hammer) added an anode in a light bulb in order to catch the flux of electrons coming out from the carbon filament and reduce the phenomenon of ...
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Hydrogen disulfide heterogenous equilibrium

Hydrogen sulfide can be removed from natural gas by the reaction $$\ce{2 H2S(g) + SO2(g) -> 3 S(s) + 2 H2O(g)}$$ a) Calculate $ΔG^\circ$ and $K$ for this reaction at $\pu{298 K}.$ b) What is the ...
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Why is the OO-H dissociation is unlikely for the Caro's Acid?

Let us consider the Caro's Acid: $\mathrm{H_2SO_5 \equiv SO_3H-OOH}$. It is widely known that the hydrogen tied with the $\mathrm{-OO-}$ group is pretty much unlikely to dissociate: $$ \text {...
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Can PDMS silicone be produced with dichloromethane?

I was taking a simulated admission test for a Technology Institute (Brazilian ITA) and one of the questions asked for the production of PDMS silicone via these described steps: Reaction of $\ce{SiO2}$...
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Why Cu+ is unstable in aqueous medium?

This was one of the question that was given in the school exam. But what I am expecting is that $\ce{Cu+}$ attains a $d^{10}$ configuration by losing one electron from s-subshell. Since it has fully ...
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Fajans' Rules Versus Lattice Enthalpy

In analyzing the solubility among $\ce{CaF2, CaCl2, CaBr2}$, I found that $\ce{CaF2}$ is insoluble due to high ionization enthalpy. But comparing among $\ce{AgF, AgCl, AgBr }$, it was said that $\...
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Why is chromate stable in basic medium and dichromate stable in acidic medium?

When I was studying the equilibrium existing between chromate and dichromate ions in the solution, I came to know that Chromate ion is more stable in basic medium while dichromate ion is stable in ...
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What is the meaning of the J value in term symbols [closed]

I understand how to work out the J values of term symbols. e.g. a d1 configuration gives J values of 5/2 and 3/2. resulting in 2D 3/2 However I dont understand the meaning of it, and why it arises.
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109 views

How to find the oxidation numbers of individual ions of a transition metal with an average fractional oxidation state

In the classical example compound of $\ce{Fe3O4}$, we know that $\frac 23$ of Fe ions display +3 oxidation state and $\frac 13$ of Fe ions display +2 oxidation state fulfilling charge neutrality ...
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Which is a dye: Ferric Acetate or Ferrous Acetate?

I’ve been trying to make Iron Acetate to dye leather and I cannot, for the life of me, figure this out experimentally. I’ve been allowing steel wool to react with pure white vinegar in a sealed glass ...
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Has anyone actually prepared Zn(HCO3)2 absent the presence of pressurized aqueous CO2?

Under normal conditions, I am not certain, as per Atomistry on $\ce{ZnCO3}$, the following quote: The hemihydrate, $\ce{2ZnCO3.H2O}$, was obtained by precipitating the solution of a zinc salt with ...
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How to test for and remove lead(II) sulfate from a sample of 1 M sulfuric acid?

If you had a clear, colourless sample of dilute sulfuric acid and suspected lead contamination, probably lead sulfate, how would you test for this? It's solubility is low in sulfuric acid solutions, ...
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107 views

Is carbon–sodium bond mainly ionic or covalent?

We all know that carbon mostly forms covalent bonds (almost always) and sodium mostly forms ionic bonds (almost always). But if $\ce{NaOH}$ reacts with ethyne, then $\ce{HC#CNa}$ and $\ce{H2O}$ are ...
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Is the magnitude of ionisation enthalpy and ionisation energy is same?

In my textbook it is written that ionisation energy and ionisation enthalpy are two different quantities. ionisation energy is the amount of energy provided to extract an electron from the outermost ...
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How to know dichromate is being reduced from Cr⁶⁺ to Cr³⁺?

When potassium dichromate is being used as an oxidising agent, it gets reduced from chromium(VI) to chromium(III). Is there any way to know that or calculate that other than being familiar with ...
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How to measure saturated salinity and mineral levels for flaked sea salt?

I am a sea salt enthusiast looking to make the perfect flakey sea salt. I start with sea water and boil it down to a thick brine. Then with less heat I reduce the brine more slowly and inverted salt ...
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How come we can't use the equivalence point equation of NV=NV in this problem?

So, the problem is you prepare to standardize a $\ce{Na2S2O3}$ solution. $\pu{32 mL}$ of $\ce{Na2S2O3}$ solution is titrated into $\pu{50 mL}$ of a $\pu{0.01 M} \ \ce{KIO3}$ solution to reach the ...
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Symmetry Adapted molecular orbitals of Formaldehyde

I am currently trying to find the Symmetry Adapted linear Combinations (SALCs) of Formaldehyde $\ce{H2C=O}$, and use the 1s orbitals on the hydrogen atoms, and 2s, 2px, 2py and 2pz orbitals on the ...
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884 views

Considering the d-d transition how, does tetracyanidonickelate(II) ion exist as a colored complex?

As I refer on google, the resources indicated that, the d block elements which have unpaired electrons as in their ions, when they are making complexes with ligands, they can absorb different ...
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Explaining the colour change in the potassium permanganate titration of iron(II) ions

In the redox titration: $$\ce{MnO4- + 8 H+ + 5 Fe^2+ -> Mn^2+ + 4 H2O + 5 Fe^3+}$$ the colour change which occurs is purple to colourless, because of the decreased concentration of permanganate ...
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60 views

Is silicon dioxide decomposition possible?

I was thinking about this, I made Gibbs free energy calculations and I can't figure out if $$\ce{SiO2(s) -> Si(s) + O2(g)}$$ is actually possible, even at a ridiculous high temperature.
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431 views

Reason for shorter bond between sulphur and oxygen?

I recently came across this sentence in my textbook: the bonds between sulphur and oxygen in oxides of sulphur ($\ce{SO2}$ and $\ce{SO3}$) are much shorter than might be expected for a single bond. ...

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