15.2 Le Chatelier's Principle

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    If a stress is placed on a system at equilibrium, the system will respond to counteract the stress.

    REACTION QUOTIENT
    Q Result
    Q < K Shift Right
    Q > K Shift Left
    Q = K At Equilibrium
    LE CHATELIER’S PRINCIPLE
    Indicate the resulting shift in equilibrium (if any) for each of the following changes to the system at equilibrium.

    2C(s) + O2(g) ⇌ 2CO(g)     ΔH° = -221kJ/mol
    Change Shift
    Increase [O2]                                                
    Decrease [CO]
    Add C(s)
    Increase Temperature
    Increase Pressure (decrease volume)                                                
    Add Ar(g) (at constant volume)