Two plastics that are targeted for recycling from household waste are polyethylene terephthalate (pete) and high density polyethylene (hdpe). one of the problems of recycling such materials is separating them. suppose you have been hired to set up a process for separating large quantities of waste plastic that is a mixture of pete and hdpe. describe how you might perform this separation.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e