Emma is doing a laboratory experiment to separate components of crude oil. she decides to use a technique that will separate the components based on their boiling points. which technique uses this principle?
a. filtration
b. distillation
c. centrifugation
d. chromatography
e. titration

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.