Which of the following describes chemical properties

Chemical properties are characteristics that change a substance. For example, when a bike comes in contact of water or oxygen it turns into rust which is Fe203. So it came from Iron and changed chemically to rust. 

Physical is different because it doesn't change its substance. Example, melting an Ice cube is a physically change because an ice cube is just frozen water and when melted, its still water just not frozen.

Ibelieve y y even though i've only taken chemistry for one year

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