Perhaps because they both involve a lot of practical work.
The alchemy classroom, like the potion study room, is located in the experimental building.
The difference is, the potion course takes place in the large lecture hall in experiment building east annex 301, half of the classroom is filled with various experiment tables, and laboratory cabinets.
The alchemy classroom, on the other hand, is in Experiment Building East 503, it's just a regular classroom, relatively small in size.
The classroom for the alchemy practicals is, reportedly, located in the basement. However, it's still out of reach for the freshmen of Astronomy Class 08-1.
They are just freshers, only about a week into school.
Classes haven't started yet, and the sounds of other classes merrymaking and horsing around in the hallway could faintly be heard, contrasting sharply with the silence in classroom 503.
The sunlight from outside the window is somewhat blinding.
