(Polar molecules, Non-polar molecules, etc.)
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It implies what side of the double bond something is located on. Two things are on the same side for cis and opposite for trans. It doesn't directly define where the dipoles are but the location of the atoms around the double bond affects the dipole directions so it is quite important.
These terms don't directly refer to the orientation of dipoles around the molecule. Cis- and trans- are used to describe geometric isomerism (isomers are molecules with the same molecular formula but different arrangements of individual atoms in space). If two groups are located on the same side of the molecule, we use cis-; if they are located on opposite sides, we use trans-.
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