8.2 free energy change

Question 1

free energy

Answer 1

the portion of a systems energy that can perform work when temperature and pressure are uniform throughout the system as in a living cell

Question 2

chemical reaction

Answer 2

∂G= ∂H- T∂S

Question 3

∂H

Answer 3

enthalpy

-total energy change

Question 4

∂S

Answer 4

entropy

Question 5

T

Answer 5

absolute temperature measured in Kelvins

Cº + 273

Question 6

negative ∂G

spontaneous?

Answer 6

spontaneous

• loss of free energy
• more stable b/c no energy to change

Question 7

positive ∂G

Answer 7

non spontaneous

Question 8

0 ∂G

Answer 8

non spontaneous

Question 9

stability

Answer 9

all systems move towards greater stability

lower ∂G

Question 10

state of maximum stability

Answer 10

equilibrium

G is at lowest possible value

Question 11

how does free energy come from equilibrium

Answer 11

when reaction is somehow pushed away from equilibrium

G becomes more positive

Question 12

spontaneous and work at equilibrium

Answer 12

• -reactions never spontaneously move away fro equilibrium
• -b/c they aren’t spontaneous, they can’t do work

–a process is only spontaneous and can perform work when it is moving towards an equilibrium

Question 13

g<0

Answer 13

spontaneous

• H>
• releases energy
• exergonic
• S<
• increase entropy (less organized)

Question 14

g>0

Answer 14

not spontaneous

• H<
• stores energy
• endergonic
• S>
• decrease entropy (more organized)

Question 15

cellular respiration

Answer 15

spontaneous

• exergonic
• less organized
• increase entropy

Question 16

photosynthesis

Answer 16

non spontaneous

• endergonic
• more organized
• decrease entropy