Is it handy to have some even if you’re not a user and aren’t regularly around users? What else does the course cover? I took a brief look on the website and couldn’t find an FAQ or something like that.

Why not use “e.g.” in that case?

I had to read this like 24 times to make sure I didn’t miss anything, but I’m 98% certain you’re correct. When referring to the individual components it should be chlorine not chloride. I’m not a chemical doctor, but this is my understanding.