2/12 entropy

Question 1

∆S is what type of function

Answer 1

state

Question 2

what is entropy a measure of

Answer 2

measure of disorder

Question 3

for an isolated system, ∆S < 0 is

Answer 3

non spontaneous

Question 4

for isolated systems, ∆S > 0 is

Answer 4

spontaneous

Question 5

for decreases in temperature, ∆S is

Answer 5

∆S < 0, decreases

Question 6

for increases in temperature, ∆S is

Answer 6

∆S > 0, increases as molecules move faster

Question 7

for vaporization, ∆S is

Answer 7

∆S>0, liquid to gas

Question 8

for melting, ∆S is

Answer 8

∆S>0, solid to liquid

Question 9

for deposition (g->s) ∆S is

Answer 9

∆S <0, gas to solid

Question 10

for chemical reactions, how does the entropy depend on the moles?

Answer 10

it depends on the moles of gas.

if the moles of gas increases, then ∆S>0

if the moles of gas decreases, then ∆S<0

Question 11

what is the third law of thermodynamics

Answer 11

the absolute entropy of a perfectly crystalline substance at 0K is zero

Question 12

for elements in their standard state at 25C, is their entropy zero?

Answer 12

no, it is a nonzero value. The only time it is zero is at 0 Kelvin