As more and more energy is added to the atoms of a solid plastic, the plastic will first change into a. a harder solid. b. a thick liquid. c. a free-moving gas. d. a volatile plasma

The right answer is B. a thick liquid.

The transmission of energy to the atoms is generally done by heat, we will have a transformation of the solid state towards a liquid state.

The melting temperature of a plastic polymer is the temperature at which its transition from the rubbery state to the liquid, heavy and viscous state takes place.

In practice, there is only fusion for semi-crystalline polymers, only the crystalline part is concerned.

explanation:

the masses of the objects and the distance between them