Does anyone know the redox equation for galvanic corrosion that occurs between copper and iron?
(basically the corrosion of the statue of liberty)

I'm not completly sure but this might be it. Fe-> Fe2+ + 2e-

The answer is probably c. xylem

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf