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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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2answers
80 views

How do you determine which entity gains or loses an H+ in an equation?

$$\ce{HCO3- (aq) + H2O(l) <=> H2CO3(aq) +OH- (aq)}$$ I do not understand why this makes an Arrhenius base and why it doesn't form: $$\ce{HCO3- (aq) + H2O(l) <=> CO3^2- (aq) +H3O+ (aq)}$$ ...
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Melting and boiling points of transition elements

The melting and boiling points of transition elements increases from scandium ($1530~\mathrm{^\circ C}$) to vanadium ($1917~\mathrm{^\circ C}$). They increase because as we go across the group, we ...
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1answer
1k views

Which d-orbital configurations form an octahedral complex?

With reference to crystal field splitting in octahedral complexes, my textbook shows the following table of distribution of $d$-orbital electrons in octahedral complexes, based on the energy ...
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8answers
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Why do compounds like SF6 and SF4 exist but SH6 and SH4 don't?

Both $\ce{SF6}$ and $\ce{SH6}$ and $\ce{SF4}$ and $\ce{SH4}$ have the same central atom and the same hybridization, but my teacher specifically mentioned that $\ce{SH6}$ and $\ce{SH4}$ don't exist. I'...
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3answers
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What is meant by “no d-orbital”?

Sulfur and oxygen belong to the same group. Sulfur has a vacant d-orbital while oxygen has no vacant d-orbital. What does having "no d-orbital" mean? Orbitals are just the spaces around the atom. ...
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1answer
5k views

Why do sodium halides react so differently with sulfuric acid?

Why do sodium halides react so differently with sulfuric acid? \begin{align} \ce{NaF + H2SO4 &-> NaHSO4 + HF} \tag{1a}\label{NaF}\\ \ce{NaCl + H2SO4 &-> NaHSO4 + HCl} \tag{...
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1answer
5k views

Why is there a charge on COOH⁻¹?

The dissociation of formic acid ($\ce{HCOOH}$) is: $$ \ce{HCOOH -> H+ + COOH-} $$ Why is there a charge on $\ce{COOH^{-1}}$ though? Is it achieved through: $$1\times(\ce{C^{4+}}) + 2\times(\ce{O^...
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3answers
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Chemically removing rust without leaving any unwanted residues

I have this iron pan that got rusty from not being properly dried. Scrubbing it I was able to get rid of most of the rust, but there's still some I just can't remove. I thought I could chemically ...
14
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1answer
3k views

What does the eta notation mean in the naming of a transition metal complex?

I am reading a paper (Gutel et al., J. Mater. Chem. 2007, 17, 3290-3292) and I have come across the following reaction: In organic solvents, the decomposition under mild conditions of ($\eta^4$-1,...
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2answers
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What are the factors behind making ice faster?

Recently I saw a video in YouTube about how to make ice in seconds. In this video, salt is added to a glass of water and then a straw is closed from one end and the other side is lit using a lighter ...
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3answers
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Please explain why dioxygen difluoride is so dangerous

I just read this article that mentioned that dioxygen difluoride is very dangerous. The terms it uses are "awful", "violently hideous" and "deeply alarming". But I couldn't get a handle on exactly ...
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1answer
249 views

Iodine clock with moving bands

Has anyone seen a version of the iodine clock reaction where instead of the system oscillating between clear and blue it shows blue bands travelling down the vessel? I ask because someone not unknown ...
2
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3answers
11k views

What is the freezing point of sulfuric battery acid?

As we all know, the freezing point of absolute sulfuric acid is 10 °C. The average lead-acid battery (sulfuric) uses ~30% sulfuric acid, and has a freezing point much lower than 10 °C. What ...
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1answer
415 views

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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2answers
975 views

Why is lead sulfide found in nature, whereas lead oxide is less common?

This question probably applies to other heavier metals as well. The only rationalization I can figure is that lead in the +2 oxidation state (which is most common) is a borderline soft acid and ...
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1answer
4k views

which chemical element has the lowest boiling point? [closed]

which chemical element has the lowest boiling point? Is it Helium(He) or is it Hydrogen(H)? Hydrogen is lighter than Helium.
6
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1answer
463 views

What does under-stoichiometric or stoichiometric mean?

When people talk about oxides like $\ce{SiO2}$ or $\ce{Al2O3}$, they use expressions like stoichiometric or under-stoichiometric. I understand that this refers to the relative composition of materials,...
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2answers
3k views

How do I write the net ionic equation for a reaction I observed

I am currently taking a general chemistry course and during a lab they had us do the following procedure: Place 2mL of 5% $ \ce{NaClO} $ solution in a test tube. Add 10 drops of cyclohexane. Add ~10 ...
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1answer
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Normal Spinel and Inverse Spinel

According to my notes, octahedral site stabilization energy (OSSE), sterical effects and electronic effects in stability create a confusion in this theory. However, we are able to solve this problem ...
2
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2answers
20k views

Does SiO₂ have polar covalent bonds or coordinate covalent bonds?

First off, I know $\ce{SiO2}$ is a network solid. I am looking at its intramolecular forces between the $\ce{Si}$ and the $\ce{O}$ molecule. On the one hand, it seems to me that this should be a polar ...
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1answer
159 views

Reconciling multiple inorganic properties for the purposes of learning these elements

How can I reconcile all of the chemical properties, physical properties and peculiar behaviour of metals in inorganic chemistry for the purposes of studying these systematically? It is very hard to ...
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2answers
5k views

Selective etchant for Al2O3 (Does not etch Al, Cu, Zn, Sn)

I'm looking for a wet-etchant to remove aluminum oxide created by anodizing, but not etch the unoxidized metal (with greater than 10:1 selectivity) I know about chromium(IV) oxide and fluorine-based ...
6
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1answer
942 views

Is it possible to separate salt from food, or at least convert it into something that doesn't taste salty?

A couple months ago, one of my room mates accidentally used a cup of salt to make apple crumble. She asked if there was any way to separate it, probably because I had recently reduced the acidity of a ...
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1answer
8k views

How to rationalise the coordination number of CsCl versus NaCl?

Question: Suggest an explanation for the coordination number in the $\ce{CsCl}$ lattice being different from those in $\ce{NaCl}$. Standard answer: Caesium ion is larger than sodium ion, hence ...
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2answers
13k views

Solubility of Calcium Fluoride in water

$\ce{CaF2}$ is insoluble in water, but $\ce{CaCl2}$, $\ce{CaBr2}$, $\ce{CaI2}$ are soluble. Why is this so?
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Anomalous electronic configurations

Cu has an anomalous electron configuration. $\ce{Cu ~=~ 1s^2~2s^2~2p^6~3s^2~3p^6~4s^1~3d^{10}}$, it does not follow the usual pattern. In this case, the 3d subshell is filled before the 4s, which ...
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1answer
132 views

Are there computer searches for new theoretical minerals in a similar vein to Folding@Home or SETI@Home?

As a surprise gift to a friend I would like to discover a new theoretical mineral and have it named after them. I have some understanding that not all minerals have been discovered, and some minerals ...
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3answers
13k views

Complexes formed by lanthanides and actinides

A very simple test for the presence of alcohols in the lab involves adding ceric(IV) ammonium nitrate solution which gives a pinkish red colour in the presence of alcohol. When I looked up the ...
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3answers
3k views

Solubility of compounds in water

Why is $\ce{NaCl}$ more soluble in water than $\ce{NaOH}$? Well, this is a question from Chemical Equilibrium and the question hints for explanation in terms of Le Chatelier's principle.
6
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1answer
150k views

What is the reaction between oxalic acid and potassium permanganate?

I've already searched online some information about this equation, but everywhere I read, there's also sulfuric acid, which we did not use in the laboratory. We only used potassium permanganate and ...
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4answers
811 views

large wavelength range and list of x/y numerical data points of elements

I'm trying to get a set of FTIR or (FTIR like range) x/y numerical data points for a couple of elements, namely Silver, Platinum, Palladium, Gold and Sodium. I've looked on line and found images ...
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1answer
115 views

Trying to identify an ion

Could anyone identify this for me? It's from a quiz bowl clue that doesn't have the answer with it. "This linear polyatomic ion containing three atoms of carbon has a negative four charge and is only ...
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1answer
2k views

Does resonance apply to NO₂⁺?

My textbook said $\ce{NO2+}$ and $\ce{NO2-}$ both have resonance structures, now I am a little bit confused since I cannot figure out the resonance structure for $\ce{NO2+}$. What is it?
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2answers
271 views

How does expansion of electron shells work?

How does it work? I've read that its about the similarity of the energy levels of $3d$ and $3p$, but shouldn't the electron shell $4s$ be filled before $3d$ if filled? So what is done with the $3d$? I'...
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1answer
141 views

Sulfuric acid recovery

I know sulfuric acid is an important catalyzer and is used in various processes. My question is, how do I recover the remaining sulfuric acid? It will be impure, and I don't know how to do the "...
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3answers
4k views

Why doesn't nitrogen monoxide dimerize?

Why doesn't Nitrogen monoxide dimerize even though there is an odd electron present whereas nitrogen dioxide does (because of the odd electron on nitrogen)?
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1answer
151 views

Is there a positive radical Aurous, Au (x+)?

Is there a positive radical Aurous, $\ce{{Au}^{x+}}$? If yes what is the value of x? We have Auric as $\ce{{Au}^{3+}}$.
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1answer
112 views

Covalently bonding amide to glass

I am unfortunately not very good at chemistry, so I am having trouble figuring out where to start on this project. I need to have some way of get some amide functional groups stuck on a substrate (...
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1answer
995 views

Why can sulfur act like a catalyst?

In the reaction of combustion of gunpowder, Sulfur is used to speed up the reaction and acts like a catalyst in that it increases the rate of reaction. However, unlike a catalyst, it is used up in ...
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2answers
13k views

Where hydrogen belongs in the Periodic Table

Why do some people say that hydrogen should be above lithium in the periodic table and others argue it should be above fluorine?
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1answer
8k views

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 ...
2
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2answers
16k views

Oxidation number of nitrogen in KCN

How can one determine the oxidation number of nitrogen in $\ce{KCN}$?
3
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1answer
184 views

What causes Copper Rose?

We made a solution of Tetrakis Copper(I) hexafluorophosphate and the usual color is yellowish. As it oxidizes to Cu(II), it should turn blue. However, our current mixture has an off color that is ...
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1answer
208 views

Electronic and geometric configuration of Fe(OH)₂

I'm having serious problems in the electron configuration of iron dioxide $\ce{Fe(OH)2}$ because all I could come up with was $\ce{Fe}$ double bonded with each oxygen and single bonded with each ...
8
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4answers
29k views

What is the reaction between Magnesium chloride and Sodium bicarbonate?

For some reason it has been very difficult to find the right answer for this question as there's so much conflicting information to be found online. Some mention a reaction where carbonic acid is made,...
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1answer
2k views

How can one find products when one knows the reagents?

I'm going to use an example (I could have used a different one); On the document it is about the study of the chemical balance of an acid-basic solution. The chemists have written the chemical ...
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1answer
3k views

What is the chemical composition of a Rubbermaid Roughneck container and is it feasible for me to make my own molds?

I'm looking for more information on the composition of a Rubbermaid Roughneck container. The description says "Roughneck containers are made with a durable polyethylene material for a lifetime of ...
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2answers
2k views

How to extract elemental bismuth from pepto bismol?

I was trying to isolate elemental bismuth from pepto bismol (bismuth subsalicylate) using the process seen here but after I added hydrochloric acid, instead of getting a pink foamy substance, I got a ...
4
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2answers
157 views

Is it possible to crystallize a solid ingot of metal from an (acidic) aquaous solution?

To my knowledge, metalic ions only precipitate from a solution as salts & and a process that could possibly produce monocristalline metal would be very interesting indutrially - I've never heard ...
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1answer
5k views

Do metallic bonds contain London dispersion forces?

On our chemistry exam, a question asks "Which force is present between Fe particles? a) Van der Waals b) Metallic" At first it seemed obvious that it was metallic; however, upon closer reading, it ...