Students were asked to draw a concept map of changes in matter at the molecular
level. An incomplete sample is provided below.
Concept Map: Particles in States of Matter
Solid
Gas
B
Liquid
Which of the following labels would be most appropriate for completing the diagram?
OA. A-particles become more tightly packed
OB. B-the pressure of the substance decreases
OC. C-kinetic energy of particles increases
OD. D-particles become more widely spaced