Le Chatelier’s Principle. When a system is in equilibrium and a stress is added to the system, the system will shift in order to alleviate itself of the stress in order to return to equilibrium Stresses: 1. concentration changes 2. temperature changes 3. pressure changes.
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2. temperature changes
3. pressure changes
A + B C Add A, shift right (away from A)
Add B, shift right (away from B)
Add C, shift left (away from C)
A + B C Remove A, shift left (toward A)
Remove B, shift left (toward B)
Remove C, shift right (toward C)
A + B C + heat Add heat, shift left (away)
Remove heat, shift right (toward)
A + B + heat C Add heat, shift right (away)
Remove heat, shift left (toward)
A(g) + B(g) C (g)
1 mole product gas vs. 2 moles of reactant gas
Increase pressure, shift right (fewest moles)
Decrease pressure, shift left (greatest moles)
N2(g) + 3H2(g) 2NH3(g) + 92 kJ/mol
What affect does each of the following have on the equilibrium system? What direction will the equation shift?