22.4 Entropy
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What is entropy?
measure of DISPERSAL of ENERGY carried by chemicals in a SYSTEM.
The greater the spread of energy of a system, the _____ the entropy.
greater
The lesser the spread of energy of a system, the _____ the entropy.
lower
A high entropy system has _____ disorder.
high
A low entropy system has _____ disorder.
low
If a reaction has a positive change in entropy, the disorder of the products is _____ than the reactants.
greater
If a reaction has a negative change in entropy, the disorder of the products is _____ than the reactants.
less
Do endothermic reactions have a positive or negative entropy change?
negative. energy overall absorbed by particles, less dispersal of energy.
Do exothermic reactions have a positive or negative entropy change?
positive. energy overall released by particles, more dispersal of energy.
What factors affect entropy change?
enthalpy change (exothermic/endothermic) changes of state
The side of the reaction with _____ gaseous moles has a lower entropy.
less due to less dispersal of energy
How do you calculate entropy change?
entropy of products - entropy of reactants
Which state has the highest entropy?
gas
Which state has the lowest entropy?
solid
Which state has the lowest entropy?
solid
What is standard entropy?
entropy of 1 MOLE of a substance under STANDARD CONDITIONS