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Lecture 11 The Five Senses of Christmas Chemistry. Duncan Wardrop December 3, 2012. The Five Senses of Christmas. smell. touch. sight. taste. sound. Jackson, D. A.; Dicks, A. P. J. Chem. Educ. 2012 , 89 , 1267-1273. Smells Good - Looks Blue!. Blue Ridge Mountains ?.

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Lecture 11 the five senses of christmas chemistry

Lecture 11

The Five Senses

of Christmas Chemistry

Duncan Wardrop

December 3, 2012


The five senses of christmas
The Five Senses of Christmas

smell

touch

sight

taste

sound

Jackson, D. A.; Dicks, A. P. J. Chem. Educ. 2012, 89, 1267-1273


Smells good looks blue
Smells Good - Looks Blue!

Blue Ridge Mountains ?

Turpentine collection in North Carolina

monoterpene global emission rate 1014 g yr-1........


Musical interlude
Musical Interlude

Blue Ridge Mountains ?


Monoterpenes a cause of the blue haze
Monoterpenes - A Cause of the Blue Haze

Virgin of the Rocks

by Leonardo da Vinci

1483-1486

nano-

particles

Blue Mountains, Australia

Haze caused by eucalyptus emissions


Sodium acetate warm to the touch
Sodium Acetate - Warm to the Touch

Crystallization of supersaturated sodium acetate in Christmas hand warmer: (a) t = 0 s; (b) t = 10 s; (c) t = 90 s


Thermodynamics supersaturation are key
Thermodynamics & Supersaturation are Key

Crystallization of supersaturated sodium acetate in Christmas hand warmer: (a) t = 0 s; (b) t = 10 s; (c) t = 90 s

Solubility of sodium acetate - 408 g/L

Melting point of sodium acetate - 58 °C (safety)

Crystallization results on a decrease in entropy (ΔS° negative)

Energy is released in the form of heat (ΔH° highly negative)

ΔG° = ΔH° - TΔS°

What about nucleation?