What is the element ch3ch2ch2ch2ch2oh?

Pentan-1-ol. 'Pentan' because it has a chain of 5 carbons. 'ol' because it has an alcohol group at the end (-OH), and the 1 represents the position of the alcohol group on the cardon chain. Though it is not an element. It is a compound which contains the elements Carbon, Hydrogen and Oxygen.

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab. 

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