Presentation on theme: "How to Draw Orbital Overlap Diagrams"— Presentation transcript:
1How to Draw Orbital Overlap Diagrams Science Learning Center
2The Key Make sure that you follow the exact same steps each time. It’s too easy to miss something if you do the drawings with a different order to the steps.You can change the order from what we show you here, but whatever order you use, use the same each tme.
3Step 1Draw the atoms in the same positions as the Lewis Dot Structure.Example:OCHH
4Step 2We’ll be focusing on all the orbitals involved in sigma bonds (the first bond between atoms) and lone pair electrons first.Draw the s orbitals for H and the hybrid orbitals for all the other atoms.Remember that 2 groups of electrons = sp, 3 grp = sp2, 4 grp = sp3.OCHH
5Step 3 Label all the orbitals. Add electrons to all the orbitals. Note that the electrons should be drawn as half arrows, not as arrows like is shown here. One should be pointing up and one should be pointing down.Add sigma symbol to all the overlaps.SP2SP2OSP2sSP2CssSP2SP2HHSS
6Step 4Now we will deal with the pi bond. Pi bonds are used to form any bond beyond the first bond (so double and triple). Recall the pi bonds are made from p orbitals. Because the C and O are sp2 hybridized, they each have a p orbital that can be used to form the pi bond.Draw one p orbital for each atom involved in the pi bond. Only label one of the orbs, because there is only one p on each atm.Add electrons one pointing up to one p orbital and one pointing down to the other p orbital.Show the connection by drawing a line from lobe to lobe.Add pi symbol to all the overlaps.SP2SP2OPSP2sSP2PCssSP2SP2HHSS
7Step 5Draw the bond angle between any three consecutive atoms. The angle is whatever number goes with the hybridization of the central atom. In this case, that is sp2 = 120 degrees.SP2SP2OPSP2sSP2PCssSP2SP2HHSS