Module 4 Sigma Bonds and Pi bonds
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How do sigma bonds form?
Sigma bonds form when electron orbitals from adjacent atoms directly overlap
What bonding is present in Alkanes?
Sigma bonds only
What can Sigma bonds do that Pi bonds can’t?
Sigma bonds can fully rotate whereas Pi bonds can not rotate
What are Pi bonds?
Pi bonds form when there is a overlap in a orbital that is between a carbon carbon atom
Why can’t Pi bonds not rotate?
Because any rotation would reduce the overlap of the p-orbital
Why are alkenes reactive, answer should refer to the bonding between.
• 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
What is the bonds angle between Alkenes?
120’ Trigonal Planer
What is the bond angle present between Alkanes?
109.5 Tetrahedral