The graph shows the heating curve of a chemical substance as it undergoes state changes from solid to liquid to gas. analyze the curve, and answer the questions
the substance is entirely solid between positions
b and c
particles of the substance are in the liquid state and are gaining kinetic energy between positions
reset
next

Particles of the substance are in liquid state will gain kinetic energy between positions C and D.

Explanation:

Problem it tells us that between B an C the substance is solid, but I would say that is solid between A and B while between B and C it is a melting process in which particles will gain energy to transform from solid to liquid.

Now between C and D the particles of the liquid will receive energy which is transformed in kinetic energy so the participles will move faster.

Between D and E the particles the energy received is spent by the particles to pass from liquid state to vapors state.