Which two statements are true for both compounds and mixtures? A. They are made up of more than one type of atom.
B. Their particles all have the same chemical formula.
C. They can be separated into two or more elements.
D. Their particles are held together by chemical bonds.

Based on the equation and the information in the table, what is the enthalpy of the reaction?

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.

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests. which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory