If you came upon an aqueous solution in the lab which reacted with a strip of magnesium , you could make the hypothesis that the compound in this solution is : a . an acid
b . a base
C. a salt

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).