8. An electrical insulator might be which of the following?
a. plastic
c. glass
b. rubber
d. any or all of these

The answer would be D because plastic, glass, and rubber are all insulators.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).