Rod vs spherical shaped molecules

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CNourian2H
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Joined: Fri Aug 30, 2019 12:16 am

Rod vs spherical shaped molecules

Postby CNourian2H » Tue Nov 12, 2019 1:27 pm

Can someone explain the key differences between rod shaped and spherical shaped molecules?

Emily Chirila 2E
Posts: 112
Joined: Sat Jul 20, 2019 12:16 am

Re: Rod vs spherical shaped molecules

Postby Emily Chirila 2E » Tue Nov 12, 2019 1:37 pm

The instantaneous dipoles in 2 nearby rod shaped molecules are closer than those found in nearby spherical molecules. This is because rod shaped molecules have more surface area that is closer to each other. Because of this, rod shaped molecules have stronger interactions than spherical molecules. This explains why rod shaped molecules tend to have much higher boiling points than spherical molecules.

805097738
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Joined: Wed Sep 18, 2019 12:20 am

Re: Rod vs spherical shaped molecules

Postby 805097738 » Tue Nov 12, 2019 7:24 pm

Rod shaped molecules have more SA and higher boiling points than spherical molecules.

Dan M -3E
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Joined: Wed Sep 18, 2019 12:19 am

Re: Rod vs spherical shaped molecules

Postby Dan M -3E » Sun Nov 17, 2019 7:47 pm

Rod shaped molecules interact more easily because of the increased surface area, and also because when they line up next to each other, their nucleus's and electrons can get closer together because in the short side of the rod, the outside of the molecule is closer to the nucleus's.

rohun2H
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Joined: Wed Sep 18, 2019 12:19 am

Re: Rod vs spherical shaped molecules

Postby rohun2H » Sun Nov 17, 2019 8:09 pm

Rod-shaped molecules allow for instantaneous dipoles to be closer and thereby stronger because rod-shaped molecules can align with more surface area close to other nearby rod-shaped molecules.

ashwathinair
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Re: Rod vs spherical shaped molecules

Postby ashwathinair » Sun Nov 17, 2019 8:13 pm

Rod-shaped molecules have stronger London dispersion bonds because they have more surface area as well as more extreme electron clumping/shifting.

Mai V 4L
Posts: 111
Joined: Fri Sep 28, 2018 12:23 am

Re: Rod vs spherical shaped molecules

Postby Mai V 4L » Fri Dec 06, 2019 5:18 pm

805097738 wrote:Rod shaped molecules have more SA and higher boiling points than spherical molecules.

and this is because they're more strongly attracted right?

Nicholas_Gladkov_2J
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Joined: Sat Aug 17, 2019 12:17 am

Re: Rod vs spherical shaped molecules

Postby Nicholas_Gladkov_2J » Sat Dec 07, 2019 12:15 am

CandiceNourian1J wrote:Can someone explain the key differences between rod shaped and spherical shaped molecules?


The main thing to remember with the rod shaped molecules is that they are closer to one another and thus the strength of the LDF is greater. With the spherical shaped molecules, they are father apart form each other and thus the LDF is not as great. Think of this as a greater surface in which the two molecules can attract.

CNourian2H
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

Re: Rod vs spherical shaped molecules

Postby CNourian2H » Sun Dec 08, 2019 3:36 am

I get it now. The rod shaped molecs have greater surface area bc of more pts of interaction btwn 2 polar molecs, which causes a stronger interaction btwn the 2 molecs. therefore, a higher BP would be needed to break up the 2 molecs.

t_rasul3I
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Joined: Wed Sep 30, 2020 9:38 pm

Re: Rod vs spherical shaped molecules

Postby t_rasul3I » Sun Nov 15, 2020 1:02 pm

rod structures have more surface area (because they are longer and stretched out) and so they will have more areas to bond whereas a spherical structure does not have as many areas to bond. As a result, 2 rod structures are more strongly held together than two spherical structures.

Will Skinner
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Joined: Wed Sep 30, 2020 9:28 pm

Re: Rod vs spherical shaped molecules

Postby Will Skinner » Sun Nov 15, 2020 1:09 pm

Two adjacent rod shaped molecules will have more surface area in contact with each other than two spherical molecules. This is significant because London dispersion forces will have a greater effect on the rod shaped molecules.


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