Unit 4: Chemical Systems and Equilibrium Flashcards
What 2 types of reactions cannot reverse?
1) Neutralization
2) Combustion
Whats an Equilibrium reaction?
A reaction that can proceed in both directions
What are the 3 characteristics of equilibrium systems?
1) The products and reactants are equal
2) The equilibrium may be approached from either side
3) For a reaction to remain at equilibrium the system must remain closed
What will changing the temperature of an equilibrium do?
It will change the value of the equilibrium concentration of reactant and products
What is an equilibrium constant expression?
Keq= products/reactants
Homogeneous Equilibrium
All the parts of the equilibrium are in the same state
Heterogeneous Equilibrium
All the parts of the equilibrium are different
What 2 states are not included in a equilibrium constant expression?
Solids and liquids
How do we know where the equilibrium lies depending on the magnitude of K?
- If K is large (> 1) the equilibrium lies to the right
- If K is small (< 1) the equilibrium lies to the left
- If K= 1 the equilibrium is equal on both sides
What is the symbol for showing a reaction has reversed?
1/K
What happens when K values are added?
Their K values are multiplied
What happens to the K value when the reaction is multiplied by any number?
The K value is the original K value to the power of that number
What does Kp represent?
Pressures instead of concentrations
What is Keq
A general term that covers both Kp and Kc; when theres a mixture of pressures and concentrations
True or False; Most reactions are reversible
True
