Sigma Bonds and Pi bonds Flashcards
1
Q
How do sigma bonds form?
A
Sigma bonds form when electron orbitals from adjacent atoms directly overlap
2
Q
What bonding is present in Alkanes?
A
Sigma bonds only
3
Q
What can Sigma bonds do that Pi bonds can’t?
A
Sigma bonds can fully rotate whereas Pi bonds can not rotate
4
Q
What are Pi bonds?
A
Pi bonds form when there is an overlap in a orbitals between a carbon carbon atom
5
Q
Why can’t Pi bonds not rotate?
A
Because any rotation would reduce the overlap of the p-orbital
6
Q
Why are alkenes reactive, answer should refer to the bonding between.
A
- Alkenes are reactive due to the Pi bond
- Pi bonds have low enthalpy, so don’t need much energy to break
- Pi bonds are sideways overlap of molecules, therefore easier to break
- The double bonds have low enthalpy
7
Q
What is the bonds angle between Alkenes?
A
120’
Trigonal Planer
8
Q
What is the bond angle present between Alkanes?
A
109.5
Tetrahedral
