In British Columbia, learning the differences between a solution and a pure substance is part of the chemistry 11 curriculum and may also be discussed in science 9 in regards to the components of matter.
Solution Chemistry F1 distinguish between solution and a pure substance
(BC Ministry of Education, 2006)
Solution Chemistry: Achievement Indicator
F1
Define solution as a homogeneous mixture comprised of a solute and solvent
Give examples of solid, liquid, or gasesous solutions