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Chemistry Music Video 21: Exo, Endo, What's The Diff

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Uploaded on Aug 30, 2009

This song describes the difference between exothermic and endothermic potential energy diagrams. All music and lyrics copyright 2007 by Mark Rosengarten. All rights reserved.

Lyrics:

Map it, graph it show me how
Reaction PE change
Exo, endo, whats the diff?
Whys it look so strange?

Reaction coordinate on the X
PE on the Y
Time to draw a PE graph
Or at least to try!

Heat of reactants where we start
The left side, on the nose
Activation energy
Is what we need to go!

Activate your reactants, yeah
Take it to the top
The activated complex
Is too hot to stop!

The activated complex
Breaks up at the end
It will form your products
Look how that line bends!

Map it, graph it show me how
Reaction PE change
Exo, endo, whats the diff?
Whys it look so strange?

(Exothermicnegative delta H)

If you start reactants high
End with products low
Its an exothermic change
Say it once more, slow!

(Exothermicnegative delta Hnegative delta H)

EX-OH-THERM-IC CHANGE!
ITS NOT STRANGE!
(I think the guy who wrote this song is deranged!)

If you start reactants low
Products higher still
Its an endothermic change
That means it is a-chill!

(Endothermicpositive delta H)

EN-DO-THERM-IC CHANGE!
ITS NOT STRANGE!
(North Dakota has a town called Home On The Range!)

Map it, graph it show me how
These diagrams bring me joy
I dont ever want to end this song

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