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Thanks for explaining this simply. Somehow I never learned this in school.
Seriously!? Huh...
This was my very first subject in college level chemistry here in Denmark.
I managed to graduate having taken no chemistry classes lol.
Most countries don't have colleges like the American ones. It's called University and you only do things related to your degree. We also don't normally do the whole major and minor thing. It's very weird that you have people in who aren't doing a chemistry course and take chemistry classes in degree level education. Instead in most places you do college or sixth form before starting University, that's a separate institution. College and sixth form does some of what high schools do in America (starting at 16), but are also just a general educational institution that anybody can attend to do any number of different qualifications. Some even offer courses that form part of a degree where you spend your last year at University.
That is literally how the school system works in Denmark, too. I'm not sure why he's taking for granted that anyone would have taken college level chemistry classes. We can pretty much pick and choose what classes we want to take starting around age 16, and once you get to a college level, your classes are just related to whatever degree you're getting.