. 12. Riley and Jill are studying what happens to matter when it changes state. They found this list of statements. Which of these statements is true? a. When matter changes state, its mass changes. b. When matter changes state, its mass remains the same. When matter changes state, its boiling point might also change. d. When matter changes state, the space between particles in the matter stays the same. of matter liquid solid and on C. bra sente​