I started with a practice test paper and got stuck on a question about balancing the equation. The reactants are almost the same as the products, except there is one less hydrogen atom than the right-hand side.
I thought about it for about an hour, and I gave up. I searched it up on the web, and finally found out the difference of a few letters: It was Ammonium, NH4 on the left-hand side, and Ammonia, NH3 on the right-hand side. It's 10 already and I was really freaking out.
