3.1.6 Chemical equilibria, Le Chatelier’s principle and Kc Flashcards
What is a ‘closed system’?
One where nothing enters or leaves the reaction
Define ‘homogenous equilibria’.
All species are in the same physical state
Define ‘dynamic equilibrium’
- Concentration of the reactants and products remain constant
- Both forward and backward reactions occur at the same rate, simultaneously
- In a closed system
What is Le Chatelier’s principle?
If a reaction at equilibrium is subjected to a change in conditions, the position of equilibrium shifts to counteract the change
Effect of catalysts on position of equilibria and yield
Neither changed by catalysts
In industry, the conditions for reversible reactions are a compromise between what? x2
- Yield
- Cost
What is the equilibria constant and units?
Kc, molar concentrations
How do you represent species using the equilibria constant, Kc?
Square brackets [X]
If you have more product, what happens to the value of Kc?
Increases
If you have less product, what happens to the value of Kc?
Decreases
Kc is only valid at a specific ______
Specific temperature
What changes Kc?
Only changes to temperature (not concentration, pressure…)
Give Kc for this reaction: A + 3B C + 2D
[C][D]2/
[A][B]3
