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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Ferrocene's band gap is supposed to make it colorless but it isn't. Why is it so?

Wang and Islam [1] state that the ferrocene molecule's band gap, i.e. the HOMO-LUMO gap at the Kohn-Sham level, is 5.03 eV, which corresponds to an absorption wavelength of at most 240 nm. So, ...
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How do i know the order of the reaction? [closed]

$$\ce{2N2O5 ↔ 2N2O4 + O2}$$ is this reaction first order or second order ? And why ? I know first order is when duplicating the concetration the velocity duplicates too, and secod order reaction is of ...
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Can hydrogen fluoride form three or more hydrogen bonds? [duplicate]

As far as I know, each $\ce{HF}$ molecule has two hydrogen bonds, one formed by its hydrogen atom and one which the $\ce{F}$-atom forms with hydrogen atom of a third $\ce{HF}$ molecule. In other ...
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Stability comparison of europium(II) and ytterbium(II) ions

“Which one of the lanthanoids given below are most stable in divalent form?” This question was asked in JEE Main 2022 (Indian entrance test for engineering). Now the question had both $\ce{Eu^2+}$ and ...
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Does iron rust because of impurities found in it (ex. carbon)?

If we, theoretically, get a piece of ideally 100% pure iron and it is left in moist air? Will it rust? My understanding of iron rust is that the Iron itself becomes the ANODE and carbon impurities (as ...
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Well I know ions have same bond order but does it also mean there bond length is same too? [closed]

This is question regarding that if bond order is same then is it necessary to have bond lengths same and if not what is true order of bond lengths
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Fluoride coating of aluminum oxide [closed]

I'm currently reading into fluorine flow water filtration & desalination [1]. The idea is to use fluorines to have minimal friction to water while repelling ions. One of the use cases is using ...
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How heating of iron results in formation of new compound? [closed]

Question: Which of the following processes results in the formation of the new compound? A. Dissolving common salt in water B. Heating water C. Heating of the platinum rod D. Heating iron rod I'...
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Why is the shielding effect of s-subshell more compared to that of p,d,f-subshell?

Screening effect: it is basically the repulsion of outer shell electrons by inner shell electrons Now, if we look at the above picture, $s$-subshell of the 3rd shell is farther away from electrons of ...
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What kind of Spinel Structure is $Co^{2+}Fe^{3+}O_4$ [closed]

It's asked to me to calculate the magnetic moment of $Co^{2+}Fe^{3+}O_4$. My question is what kind of structure it is containing only one Fe. And does Fe takes tetrahedral site or octahedral site? ...
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Relationship between d group and $\Delta_O$ value found in Tanabe-Sugano diagram

So this question came up in class recently and got me thinking, is there any relationship between the metal d group and the $\Delta_O$ found for some allowed transition in Tanabe-Sugano diagram? I ...
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Find concentration of ammonium and ammonia when 0.5 mL 25% ammonium hydroxide is mixed in 1 L H2O at 20 ºC

Doing an experiment where I do as the title says, but am struggling to know the right way to calculate the concentration of NH3 and NH4+. Ammonia 25% (Density: 0.91 kg/L, Mwt: 35.05 g/mol) One thing i'...
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How can compounds be mixture of compounds [duplicate]

My teacher told me that we can write $FeCr_{2}O_{4}$ as $FeO•Cr_2O_3$ . I am confused what does this mean. Probably $FeCr_{2}O_{4}$ is something like a mixture of $FeO$ and $Cr_2O_3$. But how is that ...
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What does it mean finely divided aluminum?

Reaction of aluminum with oxygen Finely divided aluminum Burns with oxygen with a brilliant yellow flame at high temperature and produce white aluminum (aluminum oxide).
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Will Laticrete's Spectralock 1 grout desilver a mirror's edges?

I make/sell mosaic mirrors. I'd like to use Laticrete's Spectralock 1 grout but I don't know if it will desilver the mirror's edges over time. I contacted both Laticrete and the mirror manufacturer to ...
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Why are hydrated oxide and hydroxide formulae used interchangeably for some metals?

I recently discovered that the Cr(OH)3 precipitated during group three testing in qualitative analysis is actually Cr2O3.xH2O. Why are these two formulae used interchangeably, and is there a list of ...
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When a compound is soluble in a dilute mineral acid, is it necessary that it is also soluble in that concentrated acid?

For example, Barium Phosphate is soluble in dilute mineral acids. Does that also mean that it is also soluble in concentrated form of those acids?
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What are oxidation numbers of each element in CuH?

My chemistry teacher said hydrogen when bonded with metals has oxidation number (O.N.) of −1 except CuH: in CuH the hydrogen has O.N. +1 and the copper has O.N. −1. But on the internet it is ...
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Evaporation of zinc oxide

My question involves the evaporation of silicate material (e.g., rocks, minerals, geologic material), specifically I am trying to work the number of electrons (n) that are involved in the evaporation ...
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Are nitro and nitrito-N interchangeable in the IUPAC name of a complex?

I searched but couldn't find anywhere whether nitro and nitrito-N can both be used in the IUPAC name of an inorganic complex. For example, triamminetrinitrocobalt(III) and triamminetrinitrito-N-cobalt(...
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Does manganese reacts with water at "not" standard conditions?

In my answer, I stated that manganese is said to not react with water under normal conditions although some sources say it reacts with water to liberate hydrogen gas. Does it implies that it reacts ...
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Does solid manganese reacts with atmospheric air when heated?

As discussed in my answer, manganese is not particularly reactive to air. The surface of manganese lumps oxidize to a minor extent but when it is finely divided, it becomes pyrophoric and burns in air....
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Why does the Shielding Constant of Orbitals in Slater's rule get higher, the further away we are from the electron we are considering?

My text material says: $\mathrm{Z_{eff}= Z-S}$ where $\mathrm{Z_{eff}}$ is the effective nuclear change on that specified electron; $\mathrm{Z}$ is the atomic number and $\mathrm{S}$ is the shielding ...
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Can denticity and hapticity be defined simulaneously for a ligand?

I am freshly studying coordination chemistry. What I understand from denticity and hapticity is: Denticity - no. of electron donating sites in a ligand. Hapticity - no. of electron donating atoms in a ...
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Buffer when testing soda with DCPIP

We are testing a range of sugary drinks (coca cola, orange juice, and chocolate milk) with DCPIP to detect vitamin C. The coca cola has given a false positive and we were wondering if this is due to ...
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How does the amount of Calcium Carbonate in blackboard chalk influence its quality [closed]

Does the amount of calcium carbonate in chalk influence its charecteristics ? If so please mention them
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Conductometric titration curve plotting

In the conductometric titation of HCl vs NaOH, the conductance initially decreases, reaches a minimum at equivalence point, and then the slope of the curve becomes positive: Source: https://chart-...
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Why do we sometimes change the sign for standard electrode potentials?

Question: In this cell, the copper is oxidized and $E_{cell} = \pu{+1.15 V}$. $$\begin{align} \ce{Cu^2+(aq) + 2e− -> Cu(s)} & &(E &= \pu{+0.34 V})\\ \ce{Mn^3+(aq) + e− -> Mn^2+(aq)} ...
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Do ion-exchange membranes *always* require ions to pass in both directions?

In an answer to this question, it was asserted that: Student always tend to forget that a solution must remain electrically neutral by all means. If you want a certain ion to leave water, you must ...
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Is there a material that ions can pass through but water can’t?

I was wondering whether there is a material that can pass ions (such as the ions existing in seawater) but not water. I am aware that water molecules are smaller, so they can pass through some ...
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1 answer
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Why is desalination waste usually disposed back into the sea instead of converting it into chemical products?

I was reading about the desalination processes such as reverse osmosis and capacitive deionization and their alternatives. They all work on removing ions from water and disposing them back to sea/...
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Why are strong acids good organic dehydrating reagents [duplicate]

. Is there any reason strong mineral acids like H3PO4 and H2SO4 make good organic dehydrating reagents?
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Why is it wrong to draw the Lewis structure of a molecule's atoms and then figure out the Lewis structure of that molecule

When drawing for example the Lewis structure of nitrate ion (NO3)^-1 whould it be wrong to draw nitrogen and oxygen separately and then try to figure out the structure of the ion? In that case does ...
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Why is the Conductivity trend same in fused and in dissolved or aqueous state of ionic compounds?

For an example if we take $\ce{KCl}$ and $\ce{NaCl}$ then I have understood the part where in aqueous state $\ce{Na+}$ becomes bigger than $\ce{K+}$ hence the conductivity reverses but in fused state ...
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2 votes
1 answer
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Comparison of enthalpy change for the dissolution of alkaline earth metal oxides

Compare the heat liberated per mole for the following reactions: $\ce{MgO + H2O -> Mg(OH)2}$ $\ce{CaO + H2O -> Ca(OH)2}$ $\ce{SrO + H2O -> Sr(OH)2}$ $\ce{BaO + H2O -> Ba(OH)2}$ Data for ...
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Number of bridge oxygen atoms in a silicate mineral

Total number of oxygen atom(s) which act(s) as bridge between any two silicon atoms in a mineral with composition $\ce{MM’Si3O_x}$ $(\ce{M}$ is the divalent metal ion and $\ce{M’}$ is the tetravalent ...
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Does the reaction of solid Sodium Chlorate and Hydrochloric acid generate Chlorine Dioxide?

I did this reaction on a very small scale, swirled it around to mix and react, and saw a yellow green gas come out, as Chlorine gas is one of the products. However, based on what I found online about ...
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Positions of Lowest Energy in CFT Complexes

I know that in a cubic arrangement of ligands around a metal centre (as a precursor step in the formation of a tetrahedral complex), the increase in the energy of the barycentre is lower than when the ...
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Why is ammonium ion net positively charged? [closed]

I know that this might look a very dumb question but I have been spent my days to think about it and couldn't understand and finally decided to ask. Consider Sharing of electrons to form covalent or ...
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Why chlorate(V) is one of the primary products of disproportionation reaction between chlorine gas and hot concentrated NaOH?

Cold diluted $\ce{NaOH}$ reacts with $\ce{Cl2}$ producing hypochlorite: $$\ce{2 NaOH(aq, dil, cold) + Cl2(g) -> NaClO(aq) + NaCl(aq) + H2O(l)},\tag{R1}$$ whereas hot concentrated $\ce{NaOH}$ yields ...
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In qualitative analysis for basic radicals, why are group 2 cations not precipitated along with group 4?

To ensure that group 4 cations are not precipitated with group 2, we add dil. $\ce{HCl}$ to ensure only group 2 sulfides of lower $K_\mathrm{sp}$ are precipitated. For group 4, we add $\ce{NH4OH}$ ...
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Cl-P-Cl and Cl-S-Cl Bond angles in respective PCl3 and SCl2 compounds

Both $\ce{PCl3}$ and $\ce{SCl2}$ are $\mathrm{sp^3}$ hybrid. $\ce{PCl3}$ has 1 lone pair whereas $\ce{SCl2}$ has 2 lone pairs, so due to more lp-lp repulsion, $\ce{SCl2}$ should have smaller bond ...
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Advice on reactions with copper sulphate and aluminium in swimming pool

I have a swimming pool in Portugal with a heating system of aluminium (good heat conductor) tubes, painted black and a small circulation pump. The sun shines, the pool gets warm, cost is minimal and ...
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3 votes
1 answer
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Why my Infrared data acquired in transmission mode looks like it was acquired in absorbance mode?

I'm analyzing some carbon nanotubes with DRIFTS. I mix the CNT with KBr powder and proceed to measure the spectrum of the powder. After acquiring the KBr background (in %T, peaks facing down) I ...
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3 votes
1 answer
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Atomization enthalpy trends. The case of Phosphorus

I was looking again at the periodic trends like Ionization Energy, Electron Affinity, Radius and so on. I understood all the general trends and the exeptions for these ones, but I can't fully ...
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2 votes
1 answer
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How to synthesize anhydrous zinc(II) nitrate?

I'm interested in making anhydrous zinc nitrate. I know it decomposes fairly rapidly if you heat it. It is also soluble in ethanol. Would another desiccant or a molecular sieve do the trick? Or maybe ...
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How is the cubic d-spacing formula derived from the Miller indices of a standard plane? [duplicate]

I just had a question about deriving the cubic structure d spacing formula. Just trying to work through the logic so I understand it better. If I start with the standard plane: • The plane ...
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How is 1 mole hypochlorite ion equivalent to 1 mole chlorine gas?

According to my book, 1 mole ClO- is equivalent to 1 mole Cl2. How is that even possible? 1 mole ClO- contains 1 mole Cl atoms. On the contrary, 1 mole Cl2 gas contains 2 mole Cl atoms. So, how are ...
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Table of viscosity of water vs temperature

Above is the table for water physical properties table with temperature related with a,v,b,Pr,Ra factor. This table has temperature only from 0 to 100. May I ask if there is a full table for this with ...
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I need to test fabric for arsenic, and I've found 141-year-old guidance. Is it legit?

I'm a book and paper conservator, and a few years ago had four books to restore. Their endpapers were this gorgeous green silk, but they were badly dry rotted, and needed to be removed. I suspected ...
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