The phrase "my chemistry class" refers to a specific course or lesson in which the study of chemical reactions, composition and properties of matter is taught. Full definition
The periodic table of elements that students learn in chemistry class should emerge from the theory, with all the properties of the elements precisely correct. (discovermagazine.com)
On a high note, I have started doing a grade 11 high school chemistry class online to make up for science credits I didn't do in high school. (spiceandsprout.com)
This is slightly acidic — you may remember from college chemistry classes that the neutral pH of water is around 7. (woofwhiskers.com)