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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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1answer
83 views

How do I know with which oxidation numbers I can form a certain kind of compound?

Take, for istance, phosphorus; it has eight different oxidation numbers, but it can only form two different anhydrides, phosphoric (when the oxidation number is 5) and phosphorous (when it is 3). How ...
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How Does The Mordant, Ferric Acetate, Interact With Tannins When Ebonizing Wood?

Ferric Acetate (II) and (III) are "mordants," which intensify wood staining in direct proportion to the tannin concentration in the wood. Some wood stainers add tea to increase the tannin content and ...
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Why does Cobalt have different coordination numbers in its complexes with water and thiocyanate?

I'd like to know why does cobalt(II), $\ce{Co^2+}$, form $\ce{[Co(H2O)6]^2+}$ complex with water while it forms $\ce{[Co(SCN)4]^2-}$ with the thiocyanate? Why is there $\ce{6H2O}$ but only $\ce{4 ...
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Which one of the compounds listed would we use in order to get the highest concentration of sulphate ion in a saturated solution?

Solutions are prepared by dissolving a sulphate salt in water. Which one of the compounds listed would we use in order to get the highest concentration of sulphate ion, SO42-, in a saturated solution? ...
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Can anyone explain the reaction mechanisms of these synthesis?

Can anyone explain the reaction mechanism of the following synthesis? $\ce{2NH4Cl + Ca(OH)2 -> 2NH3 + 2H2O + CaCl2}$ $\ce{(NH4)2SO4 + 2NaOH -> 2NH3 + 2H2O + Na2SO4}$
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Will heating alumina (Al2O3) to its melting point yield pure Al?

My inorganic chemistry is at a basic level, so my question is, if I heat alumina ($\ce{Al2O3}$), to its melting point around 2000 C, will I wind up with pure Al? I think the oxygen will release from ...
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Wade's rules for Zintl ions

How do you apply Wade's rules to Zintl polyhedral cluster anions ? For example, I believe $[\ce{Bi_3}]^{3-}$ is a triangle. My approach to justify would be: 5 electrons per each Bi atom 3 electrons ...
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407 views

Thermochemistry problems?

Question 1: A compound A reacts according to the following hypothetical equation and has a molecular weight of 48.36 g/mol. 3 A (s) +B (aq) ––> 2 C (aq) ∆H° = ? A sample of A, weighing 0.152 g ...
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Spectrochemical Series - Sigma Donor Capability

I fully understand and recognise the manner and which the series works. I cannot find any references for the change in sigma donor capability moving up the series. For example, comparing $\ce{Cl-}$ ...
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Edges of graphite

I've been asked this question a few times, and while I think I know the answer, I'd like to know more. Graphite, as we know, is a sheet polymer. Since polymers are bound to be finite by physical ...
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Why inert pair effect is seen in P- block elements only

why is inert pair effect specific to certain groups? Why heavier transition elements DO NOT show inert pair effect?
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Clean silver with aluminum foil and *

I already have two questions touching on this subject and there is a third question as well. The thing is that all the other question talk about cleaning silver with aluminum foil and carbonated ...
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Clean tin with aluminium

I've been using aluminium foil and table salt to clean my silverware for a long time without actually concerning myself with the chemistry behind it. A couple of days ago i started digging into the ...
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2answers
4k views

Using MO theory, give an explanation for the C-C bond length in cyanogen

1. The problem statement, all variables and given/known data 2. The attempt at a solution I know that the MO diagram for CN- is this: I am unsure how to draw the MO diagram for cyanogen. I know ...
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1answer
307 views

Why is Cu2HgI4 filtered while it is hot?

Why is it required that the solution of copper (I) tetraiodomercurate (II), which has a thermochromic property, be filtered while it is hot?
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What distinguishes a Lewis Complex from an Adduct or are they synonymous?

I cannot think of a distinction - the terms seem to be used interchangeably when talking about products of Lewis acid-base reactions. However, I am concerned that I may have overlooked a subtlety. ...
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1answer
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Why don't unstable odd electron species dimerize so that they become stable?

Why doesn't unstable odd electron compound $\ce{NO}$ dimerize to $\ce{N2O4}$? Why doesn't this structure of ozonide dimerize? But why then does $\ce{BH3}$ dimerizes to $\ce{B2H6}$, and $\ce{AlCl3}$ to ...
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Why doesn't Boron form Diborane with water?

Why is it that Boron does not form Diborane with water rather than $\ce{B2O3}$?
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1answer
72 views

Etching around corners

In etching of mono silicon, why does the etching process around the corners differ from the etching process around the flat edges? What brings about this difference and is there some way that MEMS ...
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1answer
408 views

The toxicity of carbon monoxide in terms of its interaction with haemoglobin

On the basis of its interaction with haemoglobin, explain the toxicity of carbon monoxide. I understand that ligand substitution is involved and carboxyhaemoglobin is formed meaning that the haem ...
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1answer
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Where does the energy in the exothermic reaction of CaCl2 with water come from?

Today I created $1~\mathrm{M}$ aqueous solution of $\ce{CaCl2}$ and realized that the water before the mixture had a temperature of 23.4 Celsius degrees. Then I added the $\ce{CaCl2}$ and the ...
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1answer
599 views

How is the crystal direction important for etching silicon surfaces?

I am a student of masters study with a background only in electrical engineering, but I have studied Miller indices and crystallographic planes and directions, personally, to help myself understand ...
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1answer
128 views

Determine which orbitals will form hybrids with one another

I've been teaching myself chemistry, so any help is greatly appreciated. I've been reading an online tutorial that claims the two orbitals that merge in Aluminum trihydride are 1 orbital of 2s and 2 ...
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1answer
798 views

Phase diagrams (weird region)

On the left, there is a region for $\ce{MgO(ss)}$. I've been told such regions exist because stuff are not miscible. However, does that mean the composition axis on the bottom is a lie? Namely, ...
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2answers
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Sunscreen or sunblock

When I went to the supermarket, I noticed that some of the product say sunscreen and some of them say sunblock. My question split into two part. 1) What are the different chemical substances use in ...
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1answer
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Do we need to standardize 10M of NaOH?

I made $10~\mathrm{M}$ of $\ce{NaOH}$ solution by diluting $40~\mathrm{g}$ of its pellets in distilled water. I'm not sure if it's really $10~\mathrm{M}$ or at least close enough, but I don't think ...
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How do I calculate the normality of NaBrO3?

Find the mass of $\ce{NaBrO_3}$ required to prepare $150 \text{ml}$ of $0.75N$ solution based on the reaction $$\ce{BrO_3^- +6H^+ +6e^- \bond{->}Br^- +3H_2O}$$ My analysis: $150 \text{ml}$ ...
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1answer
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Where can I find the infrared band positions for phosphorus compounds?

I am trying to interpret an IR spectrum where I have $\ce{(NPCl2)3}$ I have $\ce{P-N}$, $\ce{P=N}$ and $\ce{P-Cl}$ bonds and it is cyclic. Where can I find or does anyone know what the general ...
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234 views

Controversy over products of iodate and bisulfite?

We know that when we are trying to recognize iodate, we use sodium bisulphite to the solution and with the help of starch paper recognize the evolved $\ce{I2}$.But when I studied the books I found ...
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1answer
131 views

What is the structure of Cl₂O₆?

I couldn't find which of these is correct and even someone I asked said there's no general covincement on it, but I'm unsure whether he's correct? I reproduced the second structure a little wrong ...
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1answer
722 views

A dehydrating agent acting as an hydrating agent?

We know that $\ce{P4O10}$ is a dehydrating reagent and I might list on 100's of reaction of it's dehydrating nature, mainly orgainc elimination reaction and few inorganic oxoacid dehydrations, but it ...
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2answers
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Does dissociation require energy to occur?

I assume spontaneous separation to ions of salt solution (or acid) requires energy to occur, right? Where does that energy come from? Is it from the heat of the solution? Now, if someone devised a ...
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1answer
2k views

stone which turns to black on exposing to atmosphere?

My mom is using a stone like substance as a dye for hair recommended by a herbalist. That stone becomes black when exposed to air. Do you know which compound is this?
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604 views

How to recognize Barium sulphite?

Yes it's a white ppt which is soluble in dil. $\ce{HCl}$, but I'm not sure which of the following happens: $$\ce{BaSO3 +$dil.$HCl->Ba(HSO)3 +Cl-}\tag1$$ $$\ce{BaSO3 +2H+->Ba^2+ +SO2 ^ +H2O}\tag2$...
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1answer
7k views

reaction with Barium Chromate, Potassium nitrate

I'm confused, in the reaction:$$\ce{K_2CrO_{4(aq)} + Ba(NO_3)_{2(aq)}\rightleftharpoons BaCrO_{4(s)} + 2KNO_{3(aq)}}$$ I got a white precipitate in an opaque yellow solution and I was told that the ...
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1answer
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Why do metals tend to lose electrons, as opposed to maintaining electric neutrality?

Metals tend to lose electrons to obtain the stable noble gas configuration of 8 valence electrons. Why do they want to obtain this configuration, and how does the strength of their "desire" to obtain ...
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1answer
149 views

Why did HF disolve this lightbulb at the surface rather than more submerged points?

I watched this video where a lightbulb is suspended in a solution of HF. The result is that the HF dissolves the glass, but it seems like the part of glass on the surface reacted faster than fully ...
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What happens when adding swimming pool salt to a freshwater pool?

Why does adding swimming pool salt to a freshwater swimming pool cause a white sediment to build up and stick to the floor of the pool?
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1answer
200 views

Which group does germanium belong to?

$\mathrm{Z= 32}$ $\mathrm{1s^2\ 2s^2p^6\ 3s^2p^6d^{10}\ 4s^2p^2}$ According to me it belongs the $\mathrm{IV\ B}$ group since it has the $\mathrm{d}$ completed, but it belongs to $\mathrm{IV\ A}$. ...
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Seeking word equations

is there a general word equation so I can learn how to write out the following: With chlorine, it seems to be: Hydrocarbon + Chlorine ---> ____ + HCL With Hexane, it seems to be: Hydrocarbon + Br ---...
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What is the difference between organosilyl, alkoxysilane and silane compounds?

What is difference between organosilyl, alkoxysilane and silanes? How do these groups make a surface hydrophobic?
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1answer
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Composition of a typical printed circuit board (PCB)?

For the purposes of x-ray absorption, I'm trying to discover the average chemical composition of a typical PCB. My research so far has indicated that the most common type of PCB is designated FR-4. ...
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How do copper sulphate and the like change crystal structure on adding water of hydration?

Copper sulphate, in its hydrated form, is crystalline, whereas the anhydrous form is amorphous. Gypsum has a similar story-- on heating the crystalline dihydrate we get an amorphous hemihydrate. (...
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How to determine an unknown gas in a tube with a massless piston at equilibrium conditions?

There is a massless piston that can move freely in a horizontal tube that is closed at both ends. To the left, there is a sample of helium gas at $300~\mathrm{K}$ and $4~\mathrm{atm}$. To the right, ...
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Precautions and tips for Qualitative Inorganic Analysis of Coins

I'm a highschool student and as part of an investigatory project, I have decided to analyse which metals are present in our everyday coins. I chose this because in my previous academic year, I had ...
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1answer
137 views

Coloured compounds on reacting with oxygen

In the reaction of chlorine gas with water, Hydrogen chloride and nascent oxygen is produced.The reaction of any coloured substance with this nascent oxygen makes it colourless. Is it true?if yes, ...
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1answer
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How can I balance the redox reaction of sulfur dioxide with oxygen?

How do I balance this reaction using half-redox equations? $$\ce{2SO2 + O2->2SO3}$$ My work is: Oxidation: $\ce{SO2 + H2O -> SO3 + 2e- + 2H+}$ Reduction: $\ce{H2O + 2e- + O2 -> SO3 + 2H+}$...
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1answer
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Why are the oxide materials insulating?

Why are the oxides usually insulating? It would be nice to get an explanation with chemistry terms (e.g., electronegativity, electron affinity, etc...) and a different explanation involving the ...
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How does the radial distribution function of Vanadium differ from that of Calcium and how does this affect the ionic electron configurations?

When Vanadium is ionised it loses the 4s electron first, meaning that it's 3+ ion has a different electron configuration to Calcium despite it being isoelectronic. Can it be explained in terms of ...
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Using knowledge of radial distribution functions, how is it possible to explain the different electron configurations of V3+ and Calcium [duplicate]

I recognize that the 3d orbital decreases in energy to lower than the 4s once it becomes occupied (even if I don't completely understand why?!). However, how is the difference in electron ...