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.
The bonds are arranged symmetrically around the central C atom and because the bond dipoles cancel, the molecule is non-polar. QUESTION (2011:1) (c) For each of the following molecules: (i) Circle the phrase that describes whether the molecule contains a polar bond or a non-polar bond.Cl 4 nonâpolar molecule The molecule is tetrahedral, due to 4 electron repulsions around the central C atom. The CâCl bond is polar, due to the difference in electronegativity of C and Cl. As these polar bonds are symmetrical about the C atom in CCl 4, the effect of them is cancelled, so the molecule is non-polar.