An __ is pure substance that cant be broken down into simpler substance by chemical or physical means

In the analysis of hair and fiber samples, which does a compound comparison microscope allow for that a conventional compound microscope does not? a. simultaneous observation b. polarization c. fluorescence d. higher magnification

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel