Between points 1 and 2 heat energy is being used but the temperature is not changing. This is because the energy is being used to

Butterfly wingspan is 7.7

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   

A, it is falling action my have a good day