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.
Determine each atom's electronegativity from the table. You can determine a non polar molecule immediately if the molecules have equal electronegativity. A molecule can also be non polar if the structure of the atoms line up in a way that the outer orbital electrons cancel out electronegativity. Therefore, you need to examine the shape of the molecule. In general, V-shaped and pyramid-shaped molecules are polar. Water is polar because of the differences in the electronegativity between oxygen and hydrogen. Oxygen is highly negative compared to hydrogen.