Analyze: In the two-substance mixtures you have investigated so far, are there any situations where there is more than one correct answer? Explain.

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).

A. is your answer.  hope this