Chpt 2: Molecular Representations (Resonance and Stuff) Flashcards Preview

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Flashcards in Chpt 2: Molecular Representations (Resonance and Stuff) Deck (6)
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1

in a resonance structure, if you see an arrow pointing from a double bond to a single bond, what should you do?

Draw a double bond where the arrow head is pointing

And erase the double bond where the arrow tail is coming from

2

in a resonance structure, if you see an arrow pointing from a double bond to an atom, what should you do?

draw a lone pair on the atom where the arrow head is pointing

And erase the double bond where the arrow tail is coming from

3

what 2 rules can you never break when drawing a resonance structure?

1. you can't break the octet rules
2. you can't break any single bonds

4

when you see a pi bond and a positive charge separated by a single bond, how will the pi bond behave to make resonance?

the pi bond will always move towards the positive charge (eliminating it), and leave a new positive charge in its wake

5

when you see a lone pair and a positive charge separated by a single bond, how will the lone pair behave to make resonance?

the lone pair will always move towards the positive charge (eliminating it), and leave an appropriately updated charge on the atom it came from

6

when you see a pi bond between atoms of differing electronegativities, how will the pi bond behave to make resonance?

the pi bond will move to the more electronegative atom, in the form of lone pair, which may give a negative charge to the receiving atom and a positive charge on the atom the pi bond came from