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.
Vectors donât cancel so molecule is polar. It may be that the two lp might turn the polarity away from the F atoms but they wonât exactly match. 2. NBr3 # lp = Â½ [5e-(N) - 3e-(3Br)] = 1lp AX3E molecule is trigonal pyramidal; vectors do not cancel .: polar.3. CS2 # lp = Â½ [4e-(N) - 2x2e-(2S)] = 0lp AX2 linear: vectors cancel: nonpolar.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.