Which type of heat transfer involves the movement of warmed material? a. radiation b. conduction c. convection

The answer they are looking for is Convection, because it is usually applied to one single material, generally in liquid or gas forms, like boiling water, and the heating happens by the heated particles traveling up and taking the place of the cooler ones, that travel down and are heated themselves, and they keep doing this circle until the whole material is warmed.
Actually all three categories of heat transfer involve movement of heat of not movement of warmed material such as it happens in convection.
With conduction the difference is that you touch one warmer object to the another cooler one, they could be of the same kind or different, and the heat of one will travel to the other at the same time as the cool of the other will travel to the one, until they are the same temperature, but you see it’s not the warmed material itself that it’s moving here, it is the heat and the cool. Radiation does not require that the source of heat touch the object to be heated, because it travels through magnetic waves.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

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