Drinking Dinosaur Pee?!

It has been claimed that because all water ultimately ends up in the water cycle, we drink water that the dinosaurs peed out. What does chemistry have to say about this assertion?

Burning paper towels soaked in various metal nitrates

Igniting paper towels that have been soaked in concentrated potassium nitrate and allowed to dry yields a flame reminiscent of that produced by guncotton. Repeating this experiment with other metal nitrates produces flames with different colors, plus a few other chemical surprises! This series of experiments is fascinating and connects to a wide variety of chemical topics including combustion, redox reactions, chemical thermodynamics, and flame tests. You don't want to miss this one!

My Modified Grading Strategy

Anthony Stetzenmeyer's grading strategy provides an alternative option to offering required retakes on summative assessments. It has the added bonus of helping his AP chemistry students prepare for the AP exam while learning to cut their losses.

Chemistry Topics

acids/bases applications of chemistry aqueous solution chemistry Atomic Properties / Structure conductivity consumer chemistry Demonstrations density electrochemistry electrolysis equilibrium Food Science gases General Chemistry kinetics Laboratory Instruction liquids metals noncovalent interactions Outreach Oxidation / Reduction oxidation/reduction Phases / Phase Transitions / Diagrams Physical Chemistry physical properties Polymer Chemistry precipitation/solubility Public Understanding reactions solids stoichiometry thermodynamics