If two half lives have passed since a scientist collected a 1.00- gram sample of a U-235, how much U-235 is left now? answers for most finals chem test questions (10th)

False, as a substance changes from a solid to a liquid and from a liquid to a gas the molecules get farther apart from each other

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