A scientific is a statement that explains what always happens under very specific conditions. O hypothesis
conclusion
a
theory
O
law

Hopes this helps:

Law

A scientific law is a statement describing what always happens under certain conditions. Newton’s three laws of motion are examples of laws in physical science.

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   

The think of process to make something successful