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GOB Chemistry
Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.
Molecular Compounds
Multiple Bonds
Single, double and/or triple bonds can be used in order to draw a correct Lewis Structure.
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concept
Multiple Bonds Concept 1
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in order to draw a correct lewis structure. Multiple bonds between elements are sometimes necessary. Now we're going to stay here that a single bond is the weakest and longest form of a co valent bond that directly connects elements together, we're gonna say because of this, they're going to have the lowest bond energy and lowest bond stability. We're going to say here. Bond energy is just the energy required to break a bond in killer jewels and determines bond stability. Now we're going to stay here, let's take a look at a single bond, a double bond and a triple bond. So here, in terms of valence electrons or valence electrons used, we're going to say, remember in a single bond there are two electrons involved Which equates to basically one electron pair. In a double bond there's two bonds. Each bond has two electrons involved. So that's a total of four valence electrons involved, which it calls to electron pairs a triple bond. Each bond again has two electrons. So that's a total of six valence electrons used, which is three electron pairs. This ties into what we understand as bond strength with this which is connected to bond energy and stability. We're going to stay here that in terms of bond strength we said that that single bond is the weakest. Okay, double bonds are somewhere in the middle. So we're going to say that they are um moderate or intermediate and then triple bonds are the highest in terms of strength. Now, bond energy and bond stability, a single bond is pretty weak so therefore we shouldn't expect it to be able to endure any type of breaking. It's gonna be pretty easy to break down since they're pretty weak. So in terms of bond energy and stability they are the lowest. Double bonds are somewhere in the middle again. So they're moderate. And then triple bonds. You not only have to cut through one, but you have to cut through three bonds. So we expect their strength and stability to be highest. So they require the most energy because we have to cut through the most bonds and they have the highest stability as a result as well. So when it comes to a single bond, a double bond in a triple bond, just remember these certain characteristics that each one of them has.
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example
Multiple Bonds Example 1
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which of the following statements best describes the relationship between bond length and bond strength, or series of compounds involving bond between the same two atoms. Alright, the greater the bond strength, the longer the bond. Well, if you look up above, you know that you should have noticed that as the number of bonds increases, the length is decreasing. And we also said that in terms of stability in terms of strength, the triple bond will be the strongest. So we can see here that this triple bond is the strongest. But as a consequence it is the shortest of the bonds. So there's an inverse relationship between length and strength. So if your length is very long, your shrink is very small. So here the greater the bond strength, the longer the bond. No this is not saying they're opposites. The greater the bond street, the short of the bond. That's true. Triple bonds are the strongest but they're also the shortest. As a consequence, bond length and bond strength are not related. That's not true. The relationship between bond length and bond strength depends on other factors. No, just remember the longer the bond is, the weaker the bond will be as a result.
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Problem
Identify the least stable covalent bond.
A
N–C
B
F–Na
C
N=C
D
N≡C
E
all same strength
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