Reaction Feasibility Flashcards
Give an e.g. Of increasing and decreasing entropy?
Increasing = a puddle drying up Decreasing = a builder building a wall from loose bricks
What is the entropy of a system?
The degree of disorder of the system. The > the entropy the > the disorder
What is the third law of thermodynamics?
The entropy of a perfect crystal at 0K is zero
What happens to entropy as temp increases?
It increases
How do you calculate the standard entropy change (
Give four general principles for entropy.
1) in terms of higher entropy gases>liquids>solids
2) the more complex the molecule, the higher the entropy
3) breaking a large molecule into a smaller molecule increases the entropy
4) dissolving increases entropy
What happens to the entropy of the surroundings if heat energy is released by a reaction system into the surroundings? Give an eqn.
It increases.
DeltaSsurroundings = -deltaHsystem ➗ T
What is the second law of thermodynamics?
The total entropy of a reaction system and it’s surroundings always increases for a spontaneous change
What does Gibbs free energy (deltaG) equal?
DeltaG = deltaH - TdeltaS
What will deltaG be under standard conditions?
Negative
What does it mean if deltaG = 0
The products and reactants will be equally favoured
