Chapter 17.2

Question 0

Entropy and rxn tendency

Symbol and unit

Answer 0

Measure of disorder or randomness of particles In a system
Symbol is change S
S=Sp-Sr
Units are KJ/mol K

Question 1

Enthalpy and Rxn tendency

Answer 1

Most rxns in nature are Exothermic
Produce low NRG, stable products
Rxn proceed spontaneously

Question 2

Who has the greatest entropy btw solids liquids and gases

Answer 2

S Solid<S gas

Question 3

When are rxns favored to occur and where does nature go towards

Answer 3

When S increases

High disorder: results in low enthalpy and high entropy

Question 4

Why do reactions happen

Answer 4

1 favored by entropy

2 favored by enthalpy (low heat)

Question 5

Which matters more entropy or enthalpy

Answer 5

Depends on T

Question 6

Define Gibbs free NRG and give symbols

Answer 6

A value used to predict whether ChangeH or ChangeS will determine rxn tendency
ChangeG KJ/Mol

Question 7

What is the equation for Gibbs free NRG and another name

Answer 7

Change H - TChange S

Thermal dynamic eqn

Question 8

What does Change G mean

Answer 8

Measures the combined effects of H and S at a specific T
If G is a - value rxn is spontaneous (exergonic)
If G is + rxn is non spontaneous (endergonic)

Question 9

What if G is 0

Answer 9

Equilibrium