Survival Arts

"The system is in dynamic slinkylibrium"

I've discovered that a standard metal Slinky is not only a great tutoring tool for explaining concepts of physics such as both transverse and longitudinal wave motion, harmonics, and spring constants, but also for concepts of chemistry, namely chemical equilibrium. For those of you familiar with LeChatelier's Principle and reaction coordinate diagrams, do this: hold the ends of a metal Slinky in your hands at the same level. The activation energy for some fundamental step is represented by the high PE peak of the curve at the top. Reactants are in your left hand, products in your right. With you hands even, the enthalpy of reaction (delta H) is 0, and the Slinky oscillates around top dead center, representing an equally product-or-reactant favored reaction step. Drop your right hand, increasing negative enthalpy of reaction, and the Slinky drops quickly into the product side. Drop the left hand instead, increasing positive enthalpy of reaction, and the reaction moves toward reactants. Very cool: it's fun to watch the light of understanding in the eyes of your audience.