>>4
Well the simulator would obviously assume you are using the best tools and purest substances. Though you may be right about having to do it in real life to find out what would really happen. From what I heard if you mix ammonia with bleach it will give off chlorine gas, something that would be better done in a simulator than attempting in reality. Likewise with other chemical reactions that would produce toxic fumes or explosions. They can even make it so the simulator will tell you that "you have died" if you do something that would end up getting yourself killed.