This is because butterfly caterpillars are host specific. Plant-wise, the caterpillars of some butterfly species like asters, black-eyed Susan, clover, lupines, milkweed, sedum or violets. Aspen, birch, cherry, hackberry, oak or willow trees make caterpillars of other butterfly species equally happy.
each Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.ach Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.
We have discussed how bonds can be both polar and nonpolar. These bonds also make the entire molecule polar or nonpolar. Again, it is the polarity that accounts for many of the properties that we see in molecules-most especially, melting and boiling points, as well as solubility.e can think of ionic bonds as being the most polar a bond can be. There is nothing more polar than the ends being different by a whole, complete electrical charge. If a molecule is made of polar bonds, it may be polar or nonpolar.