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Lecture 3 Flashcards

(23 cards)

1
Q

closed system

A

energy exchange allowed between system and surroundings. Not matter.

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2
Q

isolated system

A

no exchange of energy or matter

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3
Q

first law of thermodynamics

A

Energy is conserved

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4
Q

state function

A

depends only on present state. not how it got there. ie. glucose. multiple methods of preparation but glucose is always equal.

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5
Q

delta E = ? + w

A

q + w

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6
Q

heat absorbed by the system

A

q

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7
Q

work done by the system

A

w

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8
Q

value of q when energy flows into the system

A

positive

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9
Q

value of w when energy flows into the system

A

positive

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10
Q

sign of delta H for exoothermic process

A

negative

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11
Q

second law of thermodynamics

A

system tends toward disorder. increased entropy.

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12
Q

third law of thermodynamics

A

entropy is zero at 0 K but reaching 0 K is impossible

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13
Q

a measure of the spontaneity of a process under conditions of constant temperature and pressure

A

free energy change delta G (a state function)

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14
Q

what does delta G represent in biological systems

A

maximum possible amount of useful energy obtainable form a reaction

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15
Q

when delta G is zero

A

rexn at equilibrium

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16
Q

exergonic

A

releases energy

17
Q

delta G less than zero means

A

reaction favors products or folding. releases energy and/or heat

18
Q

two driving forces of reaction

A

decreased enthalpy or increased entropy

19
Q

sign of delta S for a decrease in order

20
Q

hydrolysis of ATP relieves ___ repulsion

A

electrostatic

21
Q

transfer potential of ATP

22
Q

activation energy of ATP

23
Q

read DSC article for EC