What fraction of the lactic acid/lactate mixture is lactic acid?

What is the independent variable in this investigation? mass volume sample number substance density

Which characteristics can be used to differentiate star systems? check all that apply.

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.