1. Chemical Equilibrium Click here for blue bottle demonstration[

2. Click here for a tutorial
Chemical Equilibrium
2NO2 ⇄ N2O4
These reactions can be reversible.
Click here for a tutorial [

3. Le Chatelier’s Principle
If a change in conditions occurs, the equilibrium position will shift to cancel out the change.
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4. Le Chatelier’s Principle
Changing Concentration
Equilibrium shifts away from the excess concentration [

5. [

6. Hemoglobin, Blood, & Oxygen[

7. Le Chatelier’s Principle
Example:
NH4Cl ⇄ NH3 + HCl
If more acid (HCl) is added, which side will be “favored”?
Reactants!

8. Le Chatelier’s Principle
Changing Pressure (gases only)
If pressure increases, reaction changes to side with fewer moles. [

9. The opposite is also true…[

10. Le Chatelier’s Principle
Example:
CH4 (g) + 2 O2 (g) ⇄ CO2 (g) + 2 H2O (l)
If the pressure is increased, which side would be “favored”?
Products! (3 moles gas : 1 mole gas)

11. Le Chatelier’s Principle
Changing Temperature
If temperature increases, reaction goes to endothermic side. [

12. Le Chatelier’s Principle
Click here for Nitrogen Monoxide video.
Clip 1:
2 NO2 (g) ⇄ N2O4 (g) + energy
(Brown Gas) (White Solid)
Clip 2:
NO2 (g) + NO (g) ⇄ N2O3 (g) + energy
(Brown Gas) (Blue Solid)