finding bond length

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805098281
Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

finding bond length

Postby 805098281 » Sun Nov 11, 2018 4:47 pm

How do you calculate the different bond lengths of a molecule?

Andrea Zheng 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: finding bond length

Postby Andrea Zheng 1H » Sun Nov 11, 2018 5:13 pm

Normally bond lengths are given based on experimental data.

hazelyang2E
Posts: 57
Joined: Fri Sep 28, 2018 12:23 am

Re: finding bond length

Postby hazelyang2E » Sun Nov 11, 2018 5:32 pm

In addition, you can find the bond length of a molecule using its other properties such as ionization energy difference. So, if the ionization energy is greater, then the bond length will be shorter.

Esther Lee 4H
Posts: 67
Joined: Fri Sep 28, 2018 12:29 am

Re: finding bond length

Postby Esther Lee 4H » Sun Nov 11, 2018 5:48 pm

I remember in lecture Dr. Lavelle said something about looking the bond length up which I'm guessing means we need to be given enough information to solve for it if not I think it might be given to us.

Esther Lee 4H
Posts: 67
Joined: Fri Sep 28, 2018 12:29 am

Re: finding bond length

Postby Esther Lee 4H » Sun Nov 11, 2018 5:51 pm

From what I remember about high school chemistry though, bond length is determined by the bond order. So if there's more bonds between electrons, the stronger the pull, and therefore a shorter bond length. triple bond < double bond < single bond. single bond should be the longest because there are only 2 electrons pulling it together.

Riley Dean 2D
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Re: finding bond length

Postby Riley Dean 2D » Tue Nov 13, 2018 10:56 am

also if the structure has some single bonds and some double bonds the overall bond length will be somewhere between the given values for two types of bonds

Christopher Wendland 4F
Posts: 30
Joined: Fri Sep 28, 2018 12:29 am

Re: finding bond length

Postby Christopher Wendland 4F » Tue Nov 13, 2018 11:10 am

For covalent bonds, bond energies and bond lengths depend on many factors: electron afinities, sizes of atoms involved in the bond, differences in their electronegativity, and the overall structure of the molecule. There is a general trend in that the shorter the bond length, the higher the bond energy.

For ionic bonds, bond length is dependent on the bond order. Whether it is a single, double or triple bond. Single bonds are the longest and triple bonds are the shortest.


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