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Entropy Source: http://rhschemistry.sfinstructionalresources.wikispaces.net/Ms.Kramer's+Page.

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Presentation on theme: "Entropy Source: http://rhschemistry.sfinstructionalresources.wikispaces.net/Ms.Kramer's+Page."— Presentation transcript:

1 Entropy Source:

2 Spontaneous Process A physical or chemical change that occurs with no outside intervention

3 What is an example of a spontaneous reaction?
H2O (s)  H2O (g) ΔH = 6.01 kJ

4 ENTROPY (S) Entropy is a measure of the disorder or randomness of the particles in a system

5 The LAW OF DISORDER A spontaneous reaction always proceeds so that the entropy of the universe increases

6 Δssystem= sproducts – sreactants
ΔS < 0 : the reaction is not spontaneous ΔS > 0 : the reaction is spontaneous

7 Predicting entropy Entropy increases with changes in state

8 Predicting ENTROPY Dissolving a gas in a solvent always decreases entropy

9 PREDICTING entropy Assuming no other changes in physical state, the entropy of a system increases when the number of molecules increases

10 Predicting entropy With some exceptions, you can usually predict the change in entropy when a solid or liquid dissolves to form a solution

11 Predicting entropy An increase in temperature always is accompanied by an increase in entropy

12 PRACTICE Negative Positive

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