Questions tagged [boron-family]
For questions about the elements of the boron family (group 13), their compounds, and their physical and chemical properties.
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If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?
Many metal diboride compounds like $\ce{MgB2}$, $\ce{TiB2}$, and $\ce{ReB2}$ have laminated crystal structures with alternating sheets of metal atoms and boron atoms. If we polish the surface to ...
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Why does screening effect decrease due to d-orbital?
In 13th group, atomic radius increases from boron to aluminium. From aluminium to gallium, atomic radii decreases. From gallium to indium, atomic radii increases. And from indium to thallium, atomic ...
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Can ethylene glycol enhance the acidity of orthoboric acid?
My textbook says:
Boric acid is a weak monobasic acid but on the addition of certain organic polyhydroxy compounds, such as mannitol, glycerol, dextrose or invert sugar, it is transformed into a ...
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Dipole moment and polarity of borazine / borazole / inorganic benzene
What is the dipole moment of borazine? I tried googling it but can't find a reliable source. I searched in JD Lee too. It might have it but I could not find.
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Why is the electronegativity of indium greater than that of thallium?
Why is the electronegativity of indium greater than that of thallium?
One possibility which I had assumed was the poor shielding effect by the d and f orbitals which leads to an increase in the ...
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Why isn't orthoboric acid soluble in cold water even though it has polar B-OH bonds?
This is the information I found regarding orthoboric acid's solubility:
Textbook (NCERT India): Sparingly soluble in water (didn't say what temperature - presumably cold) and highly soluble in hot ...
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Does boron form compounds without covalent bonds?
I have read that boron, due to the very high sum of its first three ionization energies, it is not able to form its +3 ions, and thus it generally forms only covalent compounds. But in a popular ...
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Why are B-O-H and B-O-C angles in B(OH)3 and B(OCH3)3, respectively are higher than normal?
In Concise Inorganic Chemistry by JD Lee (4th edition; adapted by Sudarshan Guha), page 77 under the topic "Back Bonding" it is given:
The $\mathrm{2p}\pi$-$\mathrm{2p}\pi$ back bonding in $\ce{B(...
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Structure of crystalline boron trioxide
I recently came across the statement
The structure of crystalline $\ce{B2O3}$ consists of $\ce{BO4}$ tetrahedra, two sets of which form two types of interconnected spiral chains, three $\ce{B-O}$ ...
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Electrophilic substitution on Borazole
As Borazole ($\ce{B3N3H6}$) is aromatic, it can show electrophilic aromatic substitution. Now, my question is when borazole undergoes electrophilic aromatic substitution reaction, on which atom does ...
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What is the rationale for calling something as an 'inorganic [organic compound]'?
While studying the main groups of p-block, I have seen many compounds being labeled as an analog to some popular organic compound. For example, borazine is termed as 'inorganic benzene', while boron ...
user95829
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Ionization enthalpy for group 13 elements [duplicate]
The ionization enthalpy for elements along a group generally reduces.
But there is an exception for group 13 elements and the order is not
uniform.
The order is:
B>Tl>Ga>Al>In
According ...
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Structure of trichloroborazine
I came across a question that asked the correct structure of trichloroborazine. The two options provided were :
a) the chlorine atoms attached to the three N atoms, and
b) the chlorine atoms ...
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Why are bridge bonds weaker than terminal bonds and, H-B-H terminal bond angles larger than H-B-H bridging bond angles in diborane? [duplicate]
In Concise Inorganic Chemistry by J.D.Lee (Adapted by Sudarsan Guha, Fourth Edition), on page 83, under the topic "Bridge Bonding" it is given for diborane $(\ce{B2H6}):$
The $d_\ce{B-H}(\...
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How to decide whether diborane undergoes symmetric or asymmetric cleavage?
How does one decide whether diborane undergoes symmetric or asymmetric cleavage, given the lewis base which attacks it. Is it possible to ascertain this theoretically?
Sterics is mentioned as the ...
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Does boron exhibit +1 oxidation state?
My teacher told that boron exhibits only a $+3$ oxidation state, but he also wrote the unbalanced reaction
$$\ce{B + C -> B4C}.$$
Carbon has greater electronegativity than boron leaving us with $\...
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Oxidation states of boron
I have just been looking at https://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements and found that boron has a -5 oxidation state. I would like to know which boron compounds form ...
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What is the correct method for converting a concentration given in ppm to molarity?
I need to convert a concentration of dissolved boric acid $(\ce{H_3BO_3})$ in water (at high temperature and pressure) from ppm to mol/L.
Concentration of boric acid: $c_{ppm}=1500\ \ce{ppm}$
Molar ...
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Why do boron salts impart a characteristic green colour to the flame
In salts of boron it exists as a cation in the B(III) form. It is known to impart green colour in several of its salts like borates, boron triflourides, boric acid etc. If there are no electrons in ...
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Does adding NH3 to an HCl solution facilitate the dissolution of aluminum compounds?
If we compare the two solutions hereafter, which one would better leach/dissolve aluminum metal/compounds present at/near the inner surface of the glass:
Solution A: $10\,\%\, \ce{HCl + H2O}$
Solution ...
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Heating effect on Orthoboric Acid
I am a high school student and was studying about the effects of heating orthoboric acid, and I saw two textbooks putting different statements.
One book says,
On heating above 370K, orthoboric acid ...
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Exactly how the subscripted numbers are given to the different types of boron sheets (borophenes)?
I was going to start a project on Borophene, and hence I was going through a review journal, 2D Boron: Boraphene, Borophene, Boronene, where they have said many types of borophenes had been proposed. ...
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How to get the coordinates of β12 borophene and χ3 borophene?
Can someone tell me how to draw the β12 borophen and χ3 borophene in Materials Studio or any other software? I've just started my project work, and I'm a beginner in this field.
I have searched for ...
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What can happen to overheated aluminum cookware?
I accidentally overheated an aluminum espresso maker, to around 250-300° C in my estimation, but it might be even higher - I didn't measure, though. After research, I found that the material used is ...
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Acidic nature of boric acid when its concentration high
Following statement was given for boric acid $(\ce{H3BO3}):$
At low concentrations $(\leq\pu{0.02 M})$ essentially $\ce{B(OH)3}$ and $\ce{B(OH)4-}$ are present, but at higher concentration the ...
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Inhibitors of hydration
Superglue (Cyanoacrylate) polymerizes via hydration, and using an activator such as a borax solution speeds up that process. I need to mix these 2 without them reacting. (Or at least not noticeably.)
...
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Why does boron have higher affinity for fluorine than oxygen?
$\ce{F-}$ can displace $\ce{OH}$ in $\ce{B(OH)3}$ and form $\ce{BF3}$. $\ce{BF3}$ is stable due to resonance, but donation of oxygen should be stronger, as -I power of fluorine dominates its lone pair ...
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Please explain the order of Lewis acidic strength in trichlorides of boron group
The order of decreasing Lewis acid character as per online sources is as follows:
BCl3 > AlCl3 > GaCl3 > InCl3
Reason cited is: As we move down the group, the size of atom increases, and as a ...
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Reactivity of boron nitride BN, reaction with Cl2
lately I've been interested in chemistry of boron and it's properties.. and I am looking for more information. For example I can't really seem to find lot of information about boron nitride BN other ...
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Why is boron inert to acids and bases? [duplicate]
I was reading my school text book and in the segment related to the reactivity of group 13 elements with acids and alkalis it was written:
Boron does not react with acids and alkalis even at moderate ...
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Aluminum Monoacetate Solubility in Aqueous Medium?
Does anyone have access to the aqueous solubility value of aluminum monoacetate?
I would expect it to be slightly soluble but I've searched the internet and haven't found any solubility values. : /
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Why does boron form only covalent compounds? [duplicate]
I got two options,
The size of $\ce{B^3+}$ ions, is very small and the ion has high charge density. Thus, following Fajan's rule, boron forms covalent compounds.
The sum of the first three ionisation ...
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What is the hybridisation of the bridging oxygen atoms in the borax anion?
Below is a neat looking borax anion.
While exploring the molecule in a computer simulation (Gaussian 16, level of theory: HF/3-21G), I found that the oxygen atoms in the 8-membered outer ring had sp2 ...
user96208
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Which is more metallic: boron or silicon?
I read somewhere that boron is more metallic. Is it correct? If so, can you please elaborate?
The reason why I'm confused is because 2 factors come into play here:
When you move towards right, ...
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1
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Hydrolysis of magnesium boride
Does magnesium boride react with water to form boranes?
My attempt:
Magnesium nitride reacts with water to form ammonia and magnesium hydroxide.
Similarly, does magnesium boride also react with water ...
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1
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Bonding in boron icosahedra [closed]
How do boron atoms make five bonds with other boron atoms even if the electron configuration of unbound boron atoms is [He]2s²2p¹, i.e. there is an insufficient number of outer electrons? Are the ...
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Acid boric preparation [closed]
Is there a simple reaction to yield boric acid ($\ce{H3BO3}$) from boron trifluoride ($\ce{BF3}$)?
