Naming every alkene as cis or trans

[Madeline Fox 2B]

From now on when naming a structure, do we have to name every alkene as cis or trans?

[Jenna_Hakel_2A]

If one of the carbons has 2 of the same atom on one side, for instance if a carbon was connected to 2 H molecules, then it doesn't matter which one is on the top or bottom because both will produce the same molecule. In this case, it is not possible to say whether it is cis (Z) or trans (E). However, if it is possible to determine whether a molecule is Z or E, then yes, I think you are supposed to indicate which one it is in the name of the molecule.
Hope that helped!