Gibbs Free Energy

Question 1

delta H is . . .

Answer 1

change in enthalpy

Question 2

heat transferred b/w the system and the surroundings

Answer 2

enthalpy

Question 3

delta S is . . .

Answer 3

change in entropy

Question 4

the randomness or disorder of the system

Answer 4

entropy

Question 5

1. s –> l
2. s –> g
3. l –> g

Answer 5

+delta S

Question 6

1. g –> s
2. g –> l
3. l –> s

Answer 6

-delta S

Question 7

change that proceeds on its own w/out any outside assistance

Answer 7

spontaneous change

Question 8

change can only be spontaneous if . . .

Answer 8

delta G is negative

Question 9

+delta H and +delta S means. . .

Answer 9

spontaneous only at high T

Question 10

-delta H and +delta S means. . .

Answer 10

spontaneous at ALL T

Question 11

+delta H and -delta S means. . .

Answer 11

NON-spontaneous at all T

Question 12

-delta H and -delta S means. . .

Answer 12

spontaneous only at low T

Question 13

solid changes to liquids or gases

Answer 13

entropy increases (+delta S)

Question 14

liquids change to gases

Answer 14

entropy increases (+delta S)

Question 15

solids dissolve in liquid solutions (aq solutions)

Answer 15

entropy increases (+delta S)

Question 16

the number of gas molecules increases

Answer 16

entropy increases (+delta S)

Question 17

temp increases

Answer 17

entropy increases (+delta S)

Question 18

2NH(g) → N2(g) + 3H2(g)

Answer 18

entropy increases (+delta S) (moles of gas increased, 2:4)

Question 19

the # of particles increased

Answer 19

entropy increases (+delta S)

Question 20

a rock is crushed

Answer 20

entropy increases (+delta S) (the # of particles increased)

Question 21

2+ or more pure substances are mixed

Answer 21

entropy increases (+delta S)

Question 22

any spontaneous change is always accompanied by an overall increase in entropy

Answer 22

second law of thermodynamics

Question 23

the standard molar entropy for an element is its natural state is NOT ZERO

Answer 23

third law of thermodynamics