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.
NF3 is polar because when you draw the Lewis structure, it has a lone pair of electrons, which automatically makes it polar.itrogen trifluoride ia a polar compound, with a small dipole moment of 0.234 debye. F has a higher electrnegativity than N, with a 0.94 difference. The lone pair will also c â¦ ause a small dipole in the opposite direction to the polar bonds. This accounts for the small net dipole moment. Liam Frayne.