Equilibrium Lesson 05

Le Chatelier’s Principle

Changing temperature

Changes value of K but NOT Q

How T affects reaction depends on the enthalpy

Endothermic: ΔH>0

Heat absorbed

Heat = like a reactant

Enodthermic Affecting K equation example

A + heat ⇌ B

Exothermic: ΔH<0

Heat released

Heat = like a product

Exothermic Affecting K equation example

A ⇌ B + heat

For endothermic Increase T

= adding heat

Reactions runs in forward direction →

A must have been less than K →

K increased when T increased

For endothermic decrease T

= removing heat

Reaction runs in reverse →

K must decrease when T decreased

For exothermic increasing T

= adding product

Reaction runs in reverse →

K decreased when T increased

For exothermic Decrease T

= Removing product

Reaction runs forward →

K increased when T decreased