Entropy

Question 1

Entropy

Answer 1

Measure of disorder
S
J/mol/K

Question 2

What 3 main categories effect entropy

Answer 2

Gases
Many particles
Complex particles

Question 3

What is the Stotal equation

Answer 3

Stotal = Ssys + Ssurr

Question 4

Ssys

Answer 4

Effected by change in particle disorder
Ssys = Sprod - Sreact

Question 5

Ssurr

Answer 5

Affected by change in energy disorder
Ssurr = Enthalpy change X 1000 / T

Question 6

Determine feasibility/spontaneity from Stotal

Answer 6

+ spontaneous
- not spontaneous
Goes on own once started

Question 7

Free energy equations and feasibility

Answer 7

G = -TStot
G = H - TSsys
+ not spontaneous
- spontaneous

Question 8

How can a reaction with a + Stot be kinetically stable

Answer 8

High activation energy kinetic vs thermodynamic stability

Question 9

How can you calculate the tipping temperature of a reaction

Answer 9

Set Stot or G to 0

Question 10

Entropy K constant equations

Answer 10

Stot = R lnK
G = -RT lnK

Question 11

Enthalpy of solution

Answer 11

Energy change when one mole of a substance is dissolved in water to make an infinitely dilute solution

Question 12

Enthalpy of hydration

Answer 12

Energy change when one mole of gaseous ions are dissolved in water to make an infinitely dilute solution