Boron Family: Borane - Video Tutorials & Practice Problems
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1
concept
Boranes
Video duration:
1m
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Now, Boras represent highly reactive covalent hydride composed of only boron and hydrogen atoms. We're gonna say the simplest form is die boring in it. It's just two borings connected by hydrogen bridges. Now, what's a hydrogen bridge or bridging hydrogens? These are hydrogen atoms that unite molecules by forming two polarized covalent bonds. So here we have boring as bh three di boring, we have basically a hydrogen from each boring bridging together to these polarized bonds, one boring to another Bora. So we typically do not find boring. We find die boring when we're looking for our molecule. Now, these are rare and in depth discussions is beyond the scope of this course, because at this point, we've always told ourselves that hydrogen can only make one bond. Well, that's not true. When you get to higher levels of chemistry, you'll see that there are bridging hydrogens that can form kind of like two bonds. It's a little bit more complex than that. But don't worry, you don't have to go over it in gen C. Just realize that this is gonna be one instance where you see two bonds connecting to a hydrogen atom. This is very rare. It is not a usual thing.
2
example
Boron Family: Borane Example
Video duration:
47s
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Now based on the structure of the di boring molecule de determine the hybridization of the boron atoms. So remember we have boron here and it's connected to hydrogens and these hydrogens are connected to another one. If we just focus on one of the boron atoms, let's focus on this one. How many groups or elements is it connected to? It's connected to 1234 groups? Remember if you're connected to four groups, meaning surrounding elements or lone pairs, then you are sp three hybridized. That would mean that option C is our correct answer, right. So in this case, our hybridization for each born atom is sp three.
3
Problem
Problem
The formation of diborane from its elemental components is given below:
Determine the enthalpy value for the formation of diborane when given the enthalpy values for the following partial reactions:
A
+36 kJ
B
–3550 kJ
C
+520 kJ
D
+27 kJ
E
–171 kJ
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