5.2.2

What is entropy?
The dispersal of energy and disorder within the chemicals making up the chemical system.
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What happens to entropy when any substance changes state?
From solid to liquid to gas, its entropy increases; melting and boiling increase the randomness of the particles, so energy is more spread out and entropy is positive.
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What happens to entropy when a reaction occurs that changes the number of gaseous moles?
Reactions that produce gases result in an increase in entropy; the production of gas increases the disorder of particles, so energy is spread out more and entropy is positive.
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How do you calculate entropy?
Entropy (products) - Entropy (reactants).
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What is the Gibbs' equation?
Free energy change (G) = Enthalpy change (H) - {Temperature (T) x Entropy change (S)}.
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When is a reaction feasible?
When the free energy change (G) < 0.
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What are the limitations of predictions made for feasibility?
Free energy change (G) indicates the thermodynamic feasibility of a reaction but it does not take into account the kinetics or rate of a reaction.
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Card 2

Front

What happens to entropy when any substance changes state?

Back

From solid to liquid to gas, its entropy increases; melting and boiling increase the randomness of the particles, so energy is more spread out and entropy is positive.

Card 3

Front

What happens to entropy when a reaction occurs that changes the number of gaseous moles?

Back

Preview of the front of card 3

Card 4

Front

How do you calculate entropy?

Back

Preview of the front of card 4

Card 5

Front

What is the Gibbs' equation?

Back

Preview of the front of card 5
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