4.3 Structure and Shape  [ENDORSED]

(Polar molecules, Non-polar molecules, etc.)

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vivianndo_1L
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Joined: Fri Apr 06, 2018 11:02 am

4.3 Structure and Shape

Postby vivianndo_1L » Fri Jun 01, 2018 10:00 am

When it asks us to draw the structure of molecules so that we can determine its molecular shape, do we draw it as a ball-and-stick diagram or do we use a Lewis structure? I know the answer in the back of the book is in the form of a Lewis diagram but I just wanted to clarify.

Elizabeth Parker 1K
Posts: 33
Joined: Wed Nov 15, 2017 3:00 am

Re: 4.3 Structure and Shape  [ENDORSED]

Postby Elizabeth Parker 1K » Fri Jun 01, 2018 10:20 am

You draw the Lewis structure still!

Nicole Shak 1L
Posts: 35
Joined: Wed Nov 22, 2017 3:03 am

Re: 4.3 Structure and Shape

Postby Nicole Shak 1L » Fri Jun 01, 2018 12:50 pm

I think that it's hard to find the molecular shape without drawing out the Lewis diagram, for example some molecules may have bond angles and lone pairs, and you wouldn't know the shape without drawing these out.

Daniel Cho Section 1H
Posts: 29
Joined: Fri Jun 23, 2017 11:40 am

Re: 4.3 Structure and Shape

Postby Daniel Cho Section 1H » Fri Jun 01, 2018 4:30 pm

It is generally better to draw the Lewis structures because not only do you see the bond angles and the amount of electrons bonded to the central atom. Also, it is a lot easier to see the regions of electron density around the central atoms to determine what shape compound it takes.

I hope this helps. Please correct me if I am wrong in certain places.

Jacy Black 1C
Posts: 30
Joined: Fri Apr 06, 2018 11:01 am

Re: 4.3 Structure and Shape

Postby Jacy Black 1C » Sat Jun 02, 2018 11:47 am

I am seriously confused on 4.3 from the textbook. The answer key states that HCN is a liner shape, but C forms 4 bonds total, 3 with N and 1 with H. This means there are four regions of electron density, correct? And that means it should be a tetrahedral shape?


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