Double or single bonds

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Abigail Volk 1F
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Double or single bonds

Postby Abigail Volk 1F » Wed Oct 25, 2017 4:48 pm

How do you determine whether a Lewis structure has a single or double bond?

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Re: Double or single bonds

Postby Chem_Mod » Wed Oct 25, 2017 5:27 pm

As you're drawing the Lewis structure, it should become clear if you have too few electrons to give octets to all the atoms. In instances such as this, it is appropriate to make double bonds. Double bonds (and triple) should only be included out of necessity.

Wenjie Dong 2E
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Re: Double or single bonds

Postby Wenjie Dong 2E » Wed Oct 25, 2017 5:53 pm

Subtract total valence electrons from electrons needed to form octets structure in all atoms. Half that number we get, and then use the answer to determine whether we need single, double or triple bonds.

Yizhou Liu 3L
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Re: Double or single bonds

Postby Yizhou Liu 3L » Thu Oct 26, 2017 10:54 pm

When you draw a Lewis dot structure, you can either use two dots or a line between two atoms to represent a chemical bond. If there are two lines or four dots between two atoms, you'll know it's a double bond.

Manasvi Paudel 1A
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Re: Double or single bonds

Postby Manasvi Paudel 1A » Fri Oct 27, 2017 5:35 pm

When drawing a Lewis structure, you have to count the valence electrons of every element and multiply that number by the amount of molecules of that element if that is needed. After you know how many total electrons there are, you can start drawing the structure with, generally, the least electronegative element in the middle. You know you need to use a double bond when the octet rule is not satisfied. The octet rule depicts the tendency of atoms to want a valence shell of eight electrons.

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