Length of bonds

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Mrudula Akkinepally
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Length of bonds

Postby Mrudula Akkinepally » Thu Nov 12, 2020 2:35 am

Hi! I was wondering if the length of double bonds is always 0.2 Å shorter than that of a single bond. For example, a C-C single bond has a length of 1.54 Å while a double bond is 1.34 Å. Similarly an N-O single bond has a length of 1.40 Å while a double bond is 1.20 Å. I'm not sure if this was just a coincidence, but just curious :)

Samantha Lee 1A
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Re: Length of bonds

Postby Samantha Lee 1A » Thu Nov 12, 2020 9:31 am

As far as I know, there is no specific number that the bond lengths differ. It's just important to know that a single bond is longer than a double bond because a double bond has more electrons so the attractive force between the nucleus is stronger. Dr. Lavelle said he would give us the bond lengths if needed; I don't think you need to memorize any bond lengths. Just make sure you know the general trend.

Kelly Tran 1J
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Re: Length of bonds

Postby Kelly Tran 1J » Thu Nov 12, 2020 11:00 am

I agree with the above post. I think the important thing to focus on is the trend of bond lengths and strength. Single bonds are longer, and double bonds are shorter. Longer bonds are weaker due to a lesser attractive force between the electrons, and shorter bonds are stronger due to a greater attractive force between the electrons.

Jordan_OBrien_2k
Posts: 53
Joined: Wed Sep 30, 2020 9:43 pm

Re: Length of bonds

Postby Jordan_OBrien_2k » Sun Nov 15, 2020 11:05 pm

Along with the above responses, you should remember that the lengths of bonds show their strengths as well. The longer the length, the weaker the bond.

LovepreetSran_3H
Posts: 76
Joined: Wed Sep 30, 2020 9:33 pm

Re: Length of bonds

Postby LovepreetSran_3H » Sun Nov 15, 2020 11:17 pm

I don't think that is always the difference in length, it might just be a coincidence.

305614361
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Joined: Wed Sep 30, 2020 9:42 pm

Re: Length of bonds

Postby 305614361 » Sun Nov 15, 2020 11:41 pm

I don't think there is really a length by which they differ

Elizabeth Kaplan 3I
Posts: 119
Joined: Wed Sep 30, 2020 9:32 pm

Re: Length of bonds

Postby Elizabeth Kaplan 3I » Mon Nov 16, 2020 12:16 am

Hi! I don't think it is always this way, I am pretty sure this is just a coincidence. However, what is always true is that a double bond is shorter than a single bond. Because the double bond is shorter, it is stronger and requires more energy to break the atoms apart.


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