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Postby 204929947 » Sun May 27, 2018 9:26 pm

So as Dr. Lavelle said, shorter bonds are stronger and longer bonds are weaker, why is this? I get mixed up because he also talked about the angles in the bonds (shape of a molecule- ex: tetrahedral) why do they want to be as far away as possible??

Sophia Diaz - Dis 1B
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Re: bonds

Postby Sophia Diaz - Dis 1B » Sun May 27, 2018 9:41 pm

In the case of bonds, it has to do with the way atoms attract each other. Since the bonds are shorter, the atoms attract each other with more force and are harder to break. But when the bond is longer, the attraction is not as strong and its easier to pull the two atoms away from one another. Think of it as 2 magnets. The closer the magnets are, the harder they are to pull away but pull then farther apart and they're easy to pull away.

Atoms want to be as far away from each other as possible because of electron repulsion. Electrons all have negative charges which mean they want to get as far away from each other as possible. This is why they separate as much as possible when there are multiple fields of electron density.

MariahClark 2F
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Re: bonds

Postby MariahClark 2F » Sun May 27, 2018 9:45 pm

To answer your first question, there's a lot of math involved for the technical answer but if the dissociation energy is higher then the bond is shorter, and vice versa. For the second question, they want to be as far apart from each other because the regions with negative electrical charge will repel each other as much as physically possible.

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