Ciara’s bike has rusted, which means that the iron in the metal changed to rust. What has occurred?

an energy formation
an exothermic reaction
a chemical reaction
a precipitate formation

C: plants and animals

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