Entropy: disorder quantified

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What is entropy?
It relates how much the energy transferred stimulates disordered motion in the surroundings.
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Give the standard equation for entropy
dS= dq_rev/T
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Define a 'spontaneous process'
Occurs naturally, without the input of work (determined by quality or distribution of energy in a system).
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What is the second law of thermodynamics?
Any spontaneous process increases the disorder of the universe. << During a reversible process the entropy of the universe remains constant>> SO: ∆S_system +∆S_surroundings >= 0
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What is the third law of thermodynamics?
The entropy of any element or compound in a perfect crystal at absolute zero temperature equals zero
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Give an equation for entropy from statistics
S= K_B*ln(Ω) --> where Ω: number of micro-states or how many ways you can arrange the particles.
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What is the equation of the entropy of a mixture?
∆_mixS=K_B*N_tot(x_1*ln(x_1)+x_2*ln(x_2)) = -n_tot*R(x_1*ln(x_1)+x_2*ln(x_2))
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Card 2

Front

Give the standard equation for entropy

Back

dS= dq_rev/T

Card 3

Front

Define a 'spontaneous process'

Back

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Card 4

Front

What is the second law of thermodynamics?

Back

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Card 5

Front

What is the third law of thermodynamics?

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