Final answer:
Adding copper phthalocyanine to molten polystyrene creates a homogeneous mixture, where pigment is uniformly spread throughout the plastic resulting in evenly colored material. Copper phthalocyanine is widely used in blue dyes and gives the plastic its vibrant color.
Step-by-step explanation:
When copper phthalocyanine pigment is added to molten polystyrene, resulting in pigment molecules dispersing uniformly throughout the melt, this is an example of a homogeneous mixture (solution). Polystyrene, a commodity plastic mainly used for packaging, creates a solution with the pigment in its molten state because the pigment is evenly distributed and the final material has one uniform phase.
Furthermore, copper phthalocyanine is a coordination complex used in various dyes and pigments, responsible for their vibrant colors and is found in products such as blue ink, blue jeans, and blue paints. The uniform dispersion of pigment in the polystyrene exemplifies a homogeneous mixture, as it is difficult to distinguish the separate components of the mixture, much like salt dissolved in water forms a homogeneous solution.