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Since we have only slightly been introduced to this concept in the lectures, I do not believe that we will be asked to draw these on the exams. In spite of this, however, sigma bonds are bonds which are formed when the orbitals bond along a particular bonding plane. Pi bonds are formed when the bonds are formed perpendicular to the bonding plane which they are forming along.
I don't think you will have to draw a sigma or pi bond, but you should know how they look on the internuclear axis. Sigma bonds are bonded directly on the axis, and pi bonds are bonded above/below the axis. Therefore, sigma bonds are moveable and can rotate, but pi bonds cannot rotate.
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