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Queslion /0 (2 pointsiWhich is the correct representation of hydrogen bonding between these molecules?CHyC-N-H 0 CH; C-N-HCHy C-N-H---H-N-C-CH;CH; C-N-H-- CH;C-N-HC...

Question

Queslion /0 (2 pointsiWhich is the correct representation of hydrogen bonding between these molecules?CHyC-N-H 0 CH; C-N-HCHy C-N-H---H-N-C-CH;CH; C-N-H-- CH;C-N-HCH,CH; C-N-

Queslion /0 (2 pointsi Which is the correct representation of hydrogen bonding between these molecules? CHyC-N-H 0 CH; C-N-H CHy C-N-H---H-N-C-CH; CH; C-N-H-- CH;C-N-H CH, CH; C-N-



Answers

(a) What atoms must a molecule contain to participate in hydrogen bonding with other molecules of the same kind? (b) Which of the following molecules can form hydrogen bonds with other molecules of the same kind: $\mathrm{CH}_{3} \mathrm{~F}, \mathrm{CH}_{3} \mathrm{NH}_{2}$, $\mathrm{CH}_{3} \mathrm{OH}, \mathrm{CH}_{3} \mathrm{Br} ?$

For part a what Adam's must the molecule contained to participate in hydrogen bonding with other molecules of the same kind. So I molecule must contain. Mhm. Yeah hydrogen which is bound to electro negative atoms. Mhm. Chlorine, oxygen, nitrogen. Um We will participate in hundreds of bonding yeah with other molecules of the same kind. Okay. Okay. Yeah. Mhm. For beef which are the following molecules will form hydrogen bonds. So we have see mm three F. Which would be its chemical formula here. Yeah so here we have no H. F bond. Therefore there's no hydrogen bonding. Mhm. That looked her in this molecule. We next we'll have CH three NH 2. Mhm. And this is program here. So here we can see we have a N H bond mm And this will hydrogen bond. Okay. Mhm. With another like molecule Next molecules Ch three Ch yeah. Yeah. Mhm. Yeah to here we're gonna see we have before. We each bond therefore this will hydrogen bond. Yeah. Yeah with another like molecule. And lastly we have CH three BR received structure here and we have no HBR bond and therefore there will be no hydrogen bonding and also BR does not participate in hydrogen bonding.

Okay, so we're looking for hydrogen bonds. Hydrogen bond is when you have a hydrogen bonded directly to a nitrogen oxygen or flooring And the nitrogen oxygen or Florian has to have at least one lone pair. So let's take this first one and sketch it out a little bit so we can see what's bonded to that. Oh So the CH three groups and then there's an oh and then there's an H. So that would be the Lewis structure. So you can see that there's a hydrogen bonded directly to the oh and they have at least one lone pair. So yes, this has hydrogen bonds. Mm In the second example we've got this method group attached to the end attached to another method group attached to another method group. So our nitrogen has a lone pair. But all of these hydrogen czar bonded to the carbon. Okay, so this has no hydrogen bonds. And you need those hydrogen is bonded directly to the end truth. And then and let's sketch this one out a little bit. There's your methyl group. I want it to an end with a couple of ages and a lone pair. Okay, so we've got hydrogen that are bonded directly to a nitrogen And it has at least one long pair. So yes, this has hydrogen bonds. Okay. And then finally we've got HF Okay, so we've got a hydrogen bonded directly to a flooring which has at least one lone pair. So yes, the says hydrogen bonds

Okay, so we're looking for hydrogen bonds. Hydrogen bond is when you have a hydrogen bonded directly to a nitrogen oxygen or flooring And the nitrogen oxygen or Florian has to have at least one lone pair. So let's take this first one and sketch it out a little bit so we can see what's bonded to that. Oh, So the CH three groups and then there's an oh and then there's an H. So that would be the Lewis structure. So you can see that there's a hydrogen bonded directly to the Oh and they have at least one lone pair. So yes, this has hydrogen bonds. Mm In the second example, we've got this method group attached to the end attached to another method group attached to another method group. So our nitrogen has a lone pair. But all of these hydrogen czar bonded to the carbon. Okay, so this has no hydrogen bonds. And you need those hydrogen is bonded directly to the end. Truth. And then and let's sketch this one out a little bit. There's your methyl group. I want it to an end with a couple of ages and a lone pair. Okay, So we've got hydrogen that are bonded directly to a nitrogen And it has at least one long pair. So yes, this has hydrogen bonds. Okay. And then finally we've got HF, Okay, so we've got a hydrogen bonded directly to a flooring, which has at least one lone pair. So yes, the says hydrogen bonds.

Okay, so we're gonna decide if some substances have hydrogen bonds. Okay, so hydrogen bond is when a hydrogen is bonded directly to an end an O. R. And F. A. Nitrogen and oxygen or flooring and that nitrogen, oxygen or flooring must have at least one lone pair. So let's look at our first structure and our hydrogen is bonded directly to a florentine. Right? And it does have at least one lone pair. So this has hydrogen bonds. Mhm. Thanks in our second example, I'm gonna take some time to write this out a little more carefully so we can see exactly what's bonded to what most importantly, where the hydrogen. So in this particular one are hydrogen are bonded to a carbon. Okay, so there's no hydrogen bonds. Okay, and then we've got hydrogen peroxide H. O. H. We draw out the lewis structure and add some lone pairs. I think we can see that are hydrogen is funded to an O. So this does have hydrogen bonds And euro has at least one lone pair. You can see that we've got at least one lone pair there and then finally again, let's take some time and write this out a little more carefully. So we can see where the hydrogen czar bonded when that shorthand when they write those method groups, there's those hydrogen czar actually bonded to our carbons. Okay, so we have no hydrogen bonds. Okay, so a And see have hydrogen bonding the other two. Do not


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