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.
Report Abuse. BrF is polar due to the fact that F has a different and surprisingly has the highest electronegativity, which means that most electrons will appear on his side. Use vectors to determine if molecules are polar or not polar. was told if its symmetrical its not polar. I could understand if H-H is no polar but what about Br-F or even CH3 Are they polar or non-polar. Update: Is it right I use electronegativity by saying F is more negative so the molecule is polar..but their symmetrical. Follow.