Why are most experiments done in a laboratory

Compare and contrast physical changes with chemical changes.

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

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.