Know that changing state is an example of a physical change. In physical changes the reactant particles are not changed – the particles are simply rearranged. Know that physical changes can usually be easily reversed.

Polyethylene is a strong synthetic polymer that can be used to make toys and bottles. polyethylene is a plastic material called thermoplastic. one very useful property of thermoplastic is that when it is heated it turns into liquid, which can be molded into desired shape and size. also the material do not dissolve at room temperature.

The concentration of reactants and the concentration of products are constant. this is the best answer i could get i do not if it is right sorry if it is

Etermine whether a mixture will becom e a mechanicars (such as stirring or shaking) determine whether a mixture will become a mechanical