Increasing the concentration of the reactants, and *blank*
the size of the particles will
*blank* the rate of a reaction.

Is a logical series of steps

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   

Answer two atoms of oxygen;