Spontaneity?

Change in enthalpy (energy): H
Change in entropy (degree of order): S

Tendency to be spontaneous:  H = -ve (exo) and  S= +ve
Tendency not to be spontaneous: H = +ve (endo) and S= -ve

Predicting the sign of S
Two things to be able to do:
(1) When looking at a balanced chemical equation, a reaction will tend to be spontaneous if when comparing reactants and products
(a) there are more moles of gaseous products
(b) products are simpler, smaller, less complex
(2) Calculating S
  (products) - (reactants)
use data table pp 799-800 and additional elemental information

Next up
-calculating the slope of a line with a ruler and a pencil (slope = rise/run)
-drawing a tangent and a secant to a curve

In honour of the ether bunny funny from earlier (bunny-O-bunny), a few hare hystericals here now. Q: How many rabbits does it take to change alightbulb? Ans: Only one if it hops right to it.  Q: If you have a line of 100 rabbits in a row and 99 of them take 1 step backwards, what do you have? A: A receding hare line.  Q: How do you catch a unique rabbit? Ans: Unique up on it.  Observation: In order to catch a rabbit, you must hide behind a tree and make a noise like a carrot.