The branch of chemistry concerned with the properties and behaviour of inorganic compounds.
2
votes
1answer
36 views
Chemical methods to extract Oxygen from Rust
Let's say I have a large quantity of rust and want to extract the oxygen from it in a way that allows me to collect the oxygen in a container.
What chemical process can I use to do this and what ...
0
votes
1answer
18 views
What Could Formations of Linkage Isomers of [Co(NH3)NO2]^2+ be like ?
I am trying to draw the structure of this complex [Co(NH3)NO2]^2+ ,however I am not sure if the linkage isomers of this complex like this ;
-1
votes
2answers
73 views
What are the main axis of research in Chemistry? [closed]
I would like to know what are the main problems currently studied in Chemistry.
For some reason, it seems that there is far less vulgarisation in chemistry than the other fields, and it's hard to ...
0
votes
0answers
27 views
Why is lithium likely to explode when burnt on non-metal surfaces only?
In this YouTube video (scrolled to 3:27) the researchers rip apart a battery and extract a thin sheet of lithium. At 3:27 they set the metal sheet on fire by putting it onto some metal part and ...
1
vote
0answers
36 views
Partial pressure of water in a submerged balloon
A balloon is half filled with water at sea level ($P = 1$ atm, $T = 298$K) such that the partial pressure of water is $24$ mmHg. It is then submerged to a point where $P = 2$ atm, $T = 298$K. what ...
0
votes
1answer
54 views
Wavelength of light
how do you calculate the wavelength of light? For chemsitry lab, we calibrated the scale reading of Hg, for example, to be 4.91 cm which is violet and the given wavelength says 436. For Hg, it says ...
2
votes
1answer
23 views
Strongest chloride complex as perdicted by HSAB theory
Why won't $\ce{Ni^2+}$ form a complex with $\ce{Cl-}$, while the ions $\ce{Cu^2+}$ and $\ce{Co^2+}$ form the complexes $\ce{[CuCl4]^2-}$ and $\ce{[CoCl4]^2-}$?
According to the HSAB theory, ...
1
vote
1answer
42 views
Why does molten plastic (PLA) stick to metals (AL)?
I know this is broad so I will narrow:
Why does molten PLA stick to Aluminum?
I ask because I'm looking for a way to prevent/reduce the friction of the plastic inside the aluminum barrel of a 3D ...
-1
votes
0answers
19 views
reaction diffusion chemical elements [closed]
I am want to make an experiment of reaction-diffusion but I cannot find enough references. If anyone knows anything except the computational part of the experiment please respond. I want to learn more ...
0
votes
1answer
18 views
How do you determine which entity gains or loses an H+ in an equation?
$$\ce{HCO_3^{-}(aq) + H_2O(l) <-> H_2CO_3(aq) +OH^-(aq)}$$
I do not understand why this makes an Arrhenius base and why it doesn't form:
$$\ce{HCO_3^{-}(aq) + H_2O(l) <-> ...
2
votes
2answers
100 views
Melting and boiling points of transition elemets
The melting and boiling points of transition elements increases from scandium ($1530^\mathrm{o}\:C$) to vanadium ($1917^\mathrm{o}\:C$). They increase because as we go across the group, we have more ...
1
vote
1answer
40 views
Which d-orbital configurations form an octahedral complex?
With reference to crystal field splitting in octahedral complexes, my textbook shows the following table of distribution of $d$-orbital electrons in octahedral complexes, based on the energy ...
5
votes
4answers
150 views
Why do compounds like $\ce{SF6}$ and $\ce{SF4}$ exist but $\ce{SH6}$ and $\ce{SH4}$ don't?
Both $\ce{SF6}$ and $\ce{SH6}$ and $\ce{SF4}$ and $\ce{SH4}$ have the same central atom and the same hybridization but my teacher specifically mentioned that $\ce{SH6}$ and $\ce{SH4}$ don't exist. ...
0
votes
1answer
23 views
Diamagnetism in sulphur
Sulphur is a diamagnetic element, meaning that it has no unpaired electrons. But its electronic configuration for valence shell is just like oxygen because they are in the same group i.e ns2, np4.
My ...
1
vote
3answers
69 views
d-orbital in sulphur and oxygen
Sulphur and oxygen belong to the same group. Sulphur has a vacant d-orbital while oxygen has no vacant d-orbital.
What does having "no d-orbital" mean? Orbitals are just the spaces around the atom. ...
0
votes
1answer
65 views
Reactions of Sodium Halides with Sulphuric acid
$$\ce{NaF +H_2SO_4 \rightarrow NaHSO_4 +HF} (1a)$$
$$\ce{NaCl +H_2SO_4 \rightarrow NaHSO_4 +HCl} (1b)$$
$$\ce{2NaBr +H_2SO_4 + 2H^+ \rightarrow Br_2 +SO_2 + 2H_2O + 2Na^+} (2)$$
$$\ce{8NaI +H_2SO_4 ...
1
vote
1answer
51 views
Why is there a charge on $\ce{COOH^{-1}}$?
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+}}) + ...
4
votes
1answer
47 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
...
1
vote
2answers
79 views
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 ...
6
votes
3answers
333 views
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 ...
2
votes
1answer
64 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 ...
-1
votes
1answer
38 views
What is the freezing point of sulfuric battery acid?
As we all know, the freezing point of absolute sulfuric acid is 10C. The average lead-acid battery (sulfuric) uses ~30% sulfuric acid, and has a freezing point much lower than 10C. What constituents ...
1
vote
1answer
67 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 ...
0
votes
0answers
28 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 ...
-1
votes
1answer
45 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.
4
votes
1answer
38 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 ...
2
votes
2answers
52 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 ...
1
vote
0answers
68 views
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 ...
0
votes
0answers
44 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 ...
1
vote
0answers
47 views
Selective etchant for Al2O3 (Does not etch Al, Cu, Zn, Sn)
I'm looking for a wet-etchant to remove aluminum oxide, but not etch the unoxidized metal (with greater than 10:1 selectivity)
I know about chromium(IV) oxide and fluorine-based etchants, but those ...
4
votes
1answer
74 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 ...
0
votes
1answer
38 views
Coordination number of CsCl (high school chemistry)
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, ...
2
votes
1answer
64 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?
0
votes
1answer
28 views
How to balance this equation and where am I going wrong?
I want to balance this equation by ion-electron method: $HNO_3+H_2S\rightarrow NO+S+H_2O$
Here is what I tried:
Reduction half-reaction- $NO_3^{-}\rightarrow NO\dots (1)$ and
oxidation ...
1
vote
1answer
38 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 ...
3
votes
2answers
241 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 ...
0
votes
3answers
64 views
solubility of compounds in water
Why is NaCl more soluble in water than NaOH? Well, this is a question from Chemical Equilibrium and the question hints for explanation in terms of Le Chatelier's principle. Plz help!
2
votes
3answers
47 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 ...
0
votes
1answer
52 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 ...
0
votes
1answer
52 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?
2
votes
2answers
47 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 $3d$?
...
1
vote
1answer
72 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 ...
5
votes
2answers
69 views
Nitrogen Monoxide
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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votes
1answer
93 views
Is Lead Chloride soluble?
Silver Chloride is not soluble.
Is Lead Chloride soluble?
$Pb+2HCl$ --> $PbCl_2 + H_2$
0
votes
1answer
30 views
Is there a positive radical Aurous, ${Au}^{x+}$?
Is there a positive radical Aurous, ${Au}^{x+}$? If yes what is the value of x?
We have Auric as ${Au}^{3+}$.
5
votes
1answer
41 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 ...
0
votes
0answers
53 views
Are Zn, Cd & Hg transition elements? [closed]
My textbook describes that Zn, Cd & Hg are not transition elements. Whereas, on wikipedia it is said that they should be studied under transition elements. Are they?
2
votes
3answers
144 views
Hydrogen - its place 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?
3
votes
1answer
79 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 ...
0
votes
2answers
291 views
