Lewis Structures Method 2

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smurphy1D
Posts: 51
Joined: Mon Nov 18, 2019 12:18 am

Lewis Structures Method 2

Postby smurphy1D » Sun Jan 26, 2020 2:26 pm

In order to use the bond enthalpies method, is it necessary to write out the lewis structures of each compound?

sbeall_1C
Posts: 109
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Re: Lewis Structures Method 2

Postby sbeall_1C » Sun Jan 26, 2020 2:29 pm

It is not necessary, but it will help you to visualize how many bonds are broken on the reactant side and how many are formed on the product side.

MeeraBhagat
Posts: 95
Joined: Sat Aug 24, 2019 12:15 am

Re: Lewis Structures Method 2

Postby MeeraBhagat » Sun Jan 26, 2020 3:43 pm

As long as you can figure out which bonds are broken and formed, then you do not need to draw out the Lewis structures and you can just refer to the table of bond enthalpy values.

Helen Struble 2F
Posts: 97
Joined: Sat Aug 24, 2019 12:17 am

Re: Lewis Structures Method 2

Postby Helen Struble 2F » Sun Jan 26, 2020 4:04 pm

It never hurts to draw a Lewis structure to make sure you know exactly which bonds are being broken and which are being formed. For simple molecules, however, you can usually visualize the structure without having to draw the structure on paper.

Kaitlyn Ang 1J
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Re: Lewis Structures Method 2

Postby Kaitlyn Ang 1J » Sun Jan 26, 2020 4:07 pm

It also provides context on why we add and subtract bond enthalpies to calculate the overall change in enthalpy. When we draw Lewis structure, we show that we know that it's because of the bonds breaking and forming that we get changes in enthalpy.

Andres Merlos 2L
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Joined: Wed Sep 18, 2019 12:17 am

Re: Lewis Structures Method 2

Postby Andres Merlos 2L » Sun Jan 26, 2020 4:20 pm

It is useful to draw out the lewis structures when attempting to visualize the forming and breaking of bonds in the products or reactants. It's not necessary, but it does give you some peace of mind to justify reasoning.

Kavya Immadisetty 2B
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Re: Lewis Structures Method 2

Postby Kavya Immadisetty 2B » Sun Jan 26, 2020 4:44 pm

Although it's not absolutely necessary, it can be helpful.


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