Download Chapter 14, Section 1, pages 494-501

Chapter 14, Section 1, pages 494-501
Reversible Reactions and Chemical Equilibrium
Objectives
To contrast reactions.
To describe chemical equilibrium
To give examples of chemical equilibrium
Demo
Burn sulfur in oxygen as an example of a completion reaction.
Input
Completion Reactions and Reversible Reactions
What does reversible mean?
Completion Reactions are reactions that use up all or almost all of the reactants to form
products
S8 + 8O2 ----------->8 SO2
Reversible Reactions are those in which some of the products will reform into reactants
CaCl2 + Na2SO4 <----> CaSO4 + NaCl
Equilibrium-a leaky boat being bailed at the same rate the water is coming in
A chemical equilibrium is a state of balance between the forward and reverse reactions.
The concentration of products and reactants remains unchanged.
H2 + I2 <--------------> 2HI
See fig. 3, pg. 498
Chemical Equilibria Are Dynamic (Leaky boat)
Demo-pg. 500
Static equilibrium is a state when nothing changes. Example, when a ball bounces it will
eventually come to rest and stay that way.
Dynamic Equilibrium is when the overall reaction shows no net change but there is a
constant change between reactants and products
Reactants <--------------> Products
A Complex Ion is any metal atom or ion that bonds with more than one atom or
molecule. This forms a Ligand.
Conclusion
Review key concepts
Homework Prepare for quiz tomorrow