Test 3 Q 8  [ENDORSED]

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Test 3 Q 8

Postby sharonvivianv » Sat Jun 02, 2018 5:14 pm

I was asked to identify the shortest boxed bond and indicate whether it is stronger. I didn't know how to answer this because they look the same to me. Pls help
Inkedim_LI.jpg (804.12 KiB) Viewed 807 times
Inkedmain-qimg-d762633e966a70344cecdb9b1f1b9307_LI.jpg (802.37 KiB) Viewed 807 times

Mohamad Farhat 1L
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Re: Test 3 Q 8

Postby Mohamad Farhat 1L » Sat Jun 02, 2018 5:16 pm

the small number of elements the stronger the bond. since both have 6 bonds. 1st one has two double and two single and the second has 3 elements with 3 double bonds. which makes it stronger

Kuldeep Gill 1H
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Re: Test 3 Q 8

Postby Kuldeep Gill 1H » Sat Jun 02, 2018 10:23 pm

Since the top image includes both single and double bonds it would be longer and therefore weaker while the bottom image is composed of double bonds so it would have shorter and stronger bonds. Hope that helps!

Tiffany Chen 1A
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Re: Test 3 Q 8  [ENDORSED]

Postby Tiffany Chen 1A » Sat Jun 02, 2018 11:38 pm

You can also think about it in terms of resonance. The first structure would have resonance (you can move the double bonds around and get the same structure), which means the double bonds are actually "spread out" throughout all the bonds. So, the actual (observed) bond of the circled bond in the first structure isn't exactly a double bond; it would be something between a single bond and double bond. In other words, that bond would be slightly weaker than a normal double bond (like the one in the second structure).

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Re: Test 3 Q 8

Postby ElizabethP1L » Sun Jun 03, 2018 11:15 am

You were supposed to look at the double bond in relation to the entire molecule. Since SO3 consists of only double bonds it will be stronger than SO4-2 with also has single bonds that are weaker. Hope this helped! :)

Tina Wen 1G
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Re: Test 3 Q 8

Postby Tina Wen 1G » Sun Jun 03, 2018 11:39 am

Yes thinking about resonance structure would help! For SO4 each S-O bond is something between single and double bond, whereas SO3 is solid double bond, which makes it stronger

Myles Chang 1B
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Re: Test 3 Q 8

Postby Myles Chang 1B » Sun Jun 03, 2018 9:21 pm

I think for this question it is important to note that resonance structures are not individualized possibilities of a structure, but rather are a blend of them. Looking at the Lewis dot diagram for the top image, you could put the two double bonds in various places, meaning that the actual length (and proportionally, strength) of the bonds should be in between a single and double bond.

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Re: Test 3 Q 8

Postby FizaBaloch1J » Sun Jun 03, 2018 10:03 pm

remember, the smaller the atom, the shorter the bond, the stronger the bond.

fara valdez
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Re: Test 3 Q 8

Postby fara valdez » Sun Jun 03, 2018 11:22 pm

does that apply to all bonds?

Gabi Landes 1-H
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Re: Test 3 Q 8

Postby Gabi Landes 1-H » Sun Jun 03, 2018 11:25 pm

So a localized double bond is essentially stronger then a delocalized bond?

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