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Chemistry > Entropy and Gibbs Free > Flashcards

Entropy and Gibbs Free Flashcards

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1
Q

definition of entropy

A

measurement of disorder and randomness in system

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2
Q

definition of standard molar entropy

A

entropy the substance is in its normal state 298K 10^5Pa

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3
Q

definition of spontaneous change

A

once reaction started, it tends to continue

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4
Q

definition of system

A

chemical reactants and products themselves

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5
Q

definition of surroundings

A

everything not involved in the system

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6
Q

what value is entropy

A

positive

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7
Q

why do gases have high entropy

A

lots of energy needed to make bonds

high randomness

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8
Q

why do diamonds have low entropy

A

its solid has atoms regularly arranged

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9
Q

the more disorder =

A

more positive

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10
Q

more gas molecules =

A

higher entropy

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11
Q

larger gas molecules =

A

higher entropy

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12
Q

standard conditions

A

298K (+273 to 25)
Pressure of (pa)10^5
Normal physical state

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13
Q

how to calculate total entropy change

A

total = system + surroundings

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14
Q

units of entropy

A

J/K/mol

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15
Q

how to calculate surroundings

A

-Hreaction/T

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16
Q

definition of standard gibbs free energy of reaction

A

Gibbs free energy change when the amounts of reactants shown in stoichiometric equation react under standard conditions to form products

17
Q

definition of Standard Gibbs free energy of formation

A

Gibbs free energy change when one mole of compound is formed from its elements in their normal states under standard conditions

18
Q

what value is gibbs free energy spontaneous

A

negative

19
Q

in equilibrium what value is gibbs

A

0

20
Q

how to calculate gibbs free energy change

A

Hreaction - T(Ssystem)

21
Q

describe possible outcomes of value when gibbs reaction is endothermic

A

system is +, only spontaneous if temperature is high

system is -, not spontaneous

22
Q

describe possible outcomes of value when gibbs reaction is exothermic

A

system is +, definitely spontaneous

system is -, only spontaneous at low temperature

23
Q

what does the total energy change of gibbs free show

A

energy available to do work (G)

energy not available to do work (T(S))

Chemistry (15 decks)

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