Students are designing an experiment to test the law of conservation of mass using
the following materials: 10 g baking soda,
30 mL vinegar, an electronic balance, and a
resealable plastic bag. Describe the basic
procedure the students should follow to
model this law

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).

It will appear as o2(g) as a reactant