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.
Can anyone describe to me how and why BCl3 is non-polar as for me it should be polar as it has 3 Cl pointing in different... show more I wanted to know why is BCl3 is a non-polar molecule. I am a bit confused because my textbook says a molecule which is symmetrical will be non-polar even if it has polar covalent bonds.an anyone describe to me how and why BCl3 is non-polar as for me it should be polar as it has 3 Cl pointing in different... show more I wanted to know why is BCl3 is a non-polar molecule. I am a bit confused because my textbook says a molecule which is symmetrical will be non-polar even if it has polar covalent bonds.