How is a change in temperature related to the pressure of a contained gas? As temperature increases, pressure decreases.
As temperature increases, pressure either increases or decreases depending on the gas.
o As temperature increases, pressure increases.
As temperature increases, pressure remains constant

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).

Ithink the answer is b.