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I remember in high school we had to wash beakers with sulfuric acid to make sure there weren’t any traces of heavy metals left.
You should have used lighter metals instead.
At my high school, teachers always said that there's a biological hazard in the lab (they used the same lab for chemistry, physics, and biology), hence no laboratory class/experience. But that exact lab/room was available and used for teaching classes such as math, history, etc.
You mean they spilled something and were too scared to clean it up??
If I try to guess, it was just a ridiculous excuse instead of saying, we aren't adequately equipped to manage a laboratory and will not want to be liable if an accident happened.
Was that their subtle way of saying children are dangerous?
I'll be honest, even freshmen at university level behave like kids in a lab.