What is the difference between a quark and a lepton? Which parts of the atom are they involved with?

Ok so co(g) is not pronoused that. the only clue is that youpronouse it the oppisote way. 

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).