Chemical Equilibria Flashcards
Reaction gone to completion?
When all reactants are used up to make products
Reaction Quotient
way to quantify the amounts of rs and ps in a reaction over time, determines if reaction has gone to completion
Q = ([C] ˆc [D]ˆd)/ ([A]^a [B]ˆb)
[] means concentration
What happens to Q at equilibrium
At some point, Q stops increasing but reactants and products keep making each other
This is chemical equilibrium
At equilibrium: Qe = K
We can quantify a system using Kc
Q<K
Rs converted to Ps until equi is reached, reaction going to the right
Q>K
Ps converted back to Rs until equi is reached, reaction going to the left
When Kc is very large
When Kc is very small
equilibrium rests to the far right, gone to completion
equilibrium rests to the far left, no reaction
Le Chatelier’s principle
If equi is disturbed, system moves to counteract this and restore equi
aA + bB (equi) cC + dD
Equilibrium constant expression
What happens to value of k if temp increases?
K increases
What is Q?
The reaction quotient, used to qunatify the amount of reactants and products at any given time during a reaction
When Q stops increasing at equi, it becomes the equilibrium constant Kc
What is brown Hydrogen?
Made from fossil fuels
When does complete dissociation occur?
When the reaction goes to completion
Partial dissociation is when there is an equilibrium reaction. All chem reactions have equilibrium, it depends on the value of Kc.
What is green Hydrogen
H made from using electricity, water and electrolytes
