Here's one I wrote a *long* time ago, so don't tell me it's cheesy..
I already know. :)
Shakespearean Chemistry
Acids, bases, salts galore
spilled neutralized upon the floor...
Iron, brimstone, Bunsen's fire
leaves test tubes ruined: filled with mire...
A gram of this, a mole of that,
eye of newt and wing of bat...
Double, double, toil and trouble,
fire burn and beaker bubble...
Hark! What light through yonder window breaks?
'Tis I, the chemist, working late!