Questions tagged [ionic-compounds]
Compounds in which at least some of bonds have ionic character stronger than covalent or metallic. Many compounds called salts are ionic compounds but not all of them.
484
questions
1
vote
1
answer
125
views
Making an UV inactive salt UV active during purification of charged anion with HILIC purification?
In the context of a purification setup I am asking myself the question: Can a UV inactive charged substance made be UV active by a counter ion that absorbs UV light during a column run?
If so, when no ...
CommunityBot
- 1
5
votes
3
answers
279
views
Does chromium chromate — Cr₂(CrO₄)₃ — exist?
Is it possible to synthesise chromium(III) chromate/dichromate? The intended formulas are $\ce{Cr2(CrO4)3}$ and $\ce{Cr2(Cr2O7)3}$ and they feature both trivalent and hexavalent chromium. However, ...
- 38.4k
2
votes
0
answers
55
views
Are Fajans rules relevant to melting and boiling points of alkali metal hydrides?
Among LiH, NaH, KH, RbH, CsH the one with the highest melting point is LiH, and it keeps on decreasing till CsH. The reason for this in my textbook is that the size of cations keeps on increasing down ...
- 4,606
-1
votes
3
answers
107
views
In a crystal of NaCl, how are the NaCl molecules bonded to other NaCl molecules?
I understand that the sodium and chlorine in an individual NaCl molecule are bonded ionically, but how are the molecules in a crystal containing millions of these molecules bonded to eachother?
I'm ...
- 1,528
4
votes
1
answer
257
views
How to Derive the Born-Mayer Equation?
Born-Mayer Equation: $E_{P,min}=-A\frac{N_A|z_1z_2|e^2}{4\pi\varepsilon_0d}(1-\frac{d^*}{d})$
Here is where I have gotten:
$$
E_P=-A\frac{N_A|z_1z_2|e^2}{4\pi\varepsilon_0d}, E_P^*=N_AC'e^{-d/d^*}\\
$$...
- 22.5k
4
votes
1
answer
5k
views
Finding the atomic packing factor (APF) of Sodium Chloride and other FCC ionic compounds
For a piece of coursework I am doing, I need to calculate the atomic packing factor of some ionic compounds. I have had no formal teaching in this area, so what I know comes from information I have ...
- 828
7
votes
1
answer
438
views
How did Halogens become known as Halogens? They are not the only elements that form salts!
Having never given it a though before, I recently discovered (in a different context) that the prefix halo- actually means 'salt' or 'sea' and the suffix -gen means 'to form' or 'to generate'. So the ...
CommunityBot
- 1
13
votes
2
answers
2k
views
Could ammonium azanide exist?
In my first high school chemistry class, I misremembered nitrate as being $\ce{NH2-}$, rather than $\ce{NO3-}$, and wrote down a formula for "ammonium nitrate" that was $\ce{NH4NH2}$ (rather ...
- 38.4k
0
votes
1
answer
43
views
I have fabricated a starch film impregnated with calcium carbonate, and the film is showing hydrophobic behaviour after addition of calcium carbonate
I have fabricated an extruded starch film, impregnated with calcium carbonate. After addition of calcium carbonate the contact angle of the film has risen suggesting a more hydrophobic surface. I have ...
- 22.5k
2
votes
1
answer
159
views
How to name LiN(CF2SO3)2?
I found this compound in the list of inorganic lithium salts from this article on ScienceDirect.
It is said to be of the sulfonate group. Let's focus on the anion alone.
I'm not sure if it can be bis(...
- 163
-1
votes
1
answer
458
views
Balancing a chemical reaction with oxidation numbers
We have been teached how to balance chemical reactions with oxidation numbers in school, but somehow I can't understand it.
This is the equation to balance
$$\ce{Cu(s) + NO3−(aq) + H+(aq) -> Cu^2+(...
CommunityBot
- 1
8
votes
1
answer
464
views
What would superionic water ice look like?
Phys.org's Giant lasers crystallize water with shockwaves, revealing the atomic structure of superionic ice links to
Nature Physics: Experimental evidence for superionic water ice using shock ...
- 4,606
4
votes
0
answers
316
views
Chemistry of Rutile, CdCl2 and CdI2
During lectures, we were told that 3d transition metal fluorides generally prefer a rutile structure. Chlorides prefer a $\ce{CdCl2}$ structure where $\ce{Cl-}$ adopt a CCP lattice and the metal ...
- 60k
0
votes
1
answer
34
views
How to determine the dynamic of progression of two simultaneous precipitation (double replacement) reactions? [duplicate]
We have a solution of mineral water with potassium chromate added to it, and want to titrate the chloride ions in the mineral water. We were told to use silver nitrate for this, which would produce ...
- 34.3k
-3
votes
1
answer
78
views
How would the regions of this graph showing percentage of ionic character, be classified? [closed]
Looking here at this website - Omnicalculator, at the section of the website for calculating percentage of ionic character. Omnicalculator - Percentage Ionic Character
They let you choose elements and ...
- 42.7k