Alkenes

for each carbon atom of the double bond how many electrons are used in the sigma bond, what bonds are they used in

3 of the 4, one to the other carbon atom in the double bond and two to the other atoms around the carbon

what is a pi bond

formed by the sideways overlap of two p orbitals, one from each carbon atom in the double bond

what does the pi bond prevent the carbon atoms from doing

rotating around the double bond

what is the shape around each of the carbons in the double bond, whats the bond angle and why is it that

triaganol planar, bond angle is 120 because there are 3 regions of electron density around each carbon atom which repel each other

what is the mechanism for making alkenes into saturated compounds

electrophillic addition

what is an electrophile

an atom of group of atoms that are attracted to an electron rich centre and accepts an electron pair