Lewis Structures Method 2
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Lewis Structures Method 2
In order to use the bond enthalpies method, is it necessary to write out the lewis structures of each compound?
Re: Lewis Structures Method 2
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.
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Re: Lewis Structures Method 2
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.
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Re: Lewis Structures Method 2
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.
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Re: Lewis Structures Method 2
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.
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Re: Lewis Structures Method 2
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.
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