02 Notes - Gibbs Free Energy

02 Notes - Gibbs Free Energy - Aim: How can we predict...

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Aim: How can we predict whether a reaction will be spontaneous or not? QQ: What does it mean when S is positive? Negative? Do Now: What situations (in terms of entropy and enthalpy) are most favorable for a reaction? Favorable Reaction Conditions Exothermic reaction (- H) o Once activation energy is provided, reaction will proceed without any additional energy o Leads to a decrease in energy of the system Increase in entropy (+ S) o Nature tends to move to a state of disorder naturally o Disorder leads to a decrease in energy of the system Does this mean other types of reactions cannot occur? Spontaneity Spontaneous Reaction: a reaction that can occur under a given set of conditions which results in an overall release of energy Non-spontaneous reactions CAN occur! But, these reactions require energy to be continually put into the system… Three factors affect the spontaneity of a reaction: Enthalpy – is energy released or absorbed?
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02 Notes - Gibbs Free Energy - Aim: How can we predict...

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