It's the typical classroom dilemma for the modern day science teacher. The little bastards just don't have the attention span to learn the 20 or so common polyatomic ions. They aren't willing to study the rules for naming ionic compounds. It's an uphill battle. You're looking for something... ANYTHING that will get their attention for at least 10 minutes of your 60 minute class. Then, you find it. Let's teach them to make bombs.
Real smart there, chief.
Hell, one of my students is having a hard time convincing me to demo a thermite reaction. Why, just today he was using the molecule kit to model TNT. I don't think he needs any encouraging from me.
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