Which example involves a phase change in which heat energy is released by the substance? freezing ice cream cooking a pot of soup melting ice under sunlight watching frost disappear into air

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   

Idon't know hope someone you