Equilibrium

Aligned Standards SC.912.P.12.13 Explain the concept of dynamic equilibrium in terms of reversible processes occurring at the same rates.

Objectives SWBAT explain that equilibrium is established when forward and reverse reaction rates are equal. SWBAT describe how the rate of chemical equilibrium will shift when altering the various environmental and physical conditions.

Essential Questions To what extent are chemical reactions reversible?

H.O.T Questions What will happen to a reaction which is at equilibrium if more or less pressure is added? What could happen to a reaction which is at equilibrium if more or less heat is added? What could happen to a reaction which is at equilibrium if more or less products are added?

Name the different 5 factors that effect reaction rates. Do Now Name the different 5 factors that effect reaction rates. Catalyst Temperature Surface area Pressure Concentration

Objective 1 Explain that equilibrium is established when forward and reverse reaction rates are equal.

Have you ever wondered… How do mood rings work? Depression or Boredom = low blood circulation Decreased finger temperature Anger or Passion = high blood circulation Increased temperature

What is chemical equilibrium? Turns out that most reactions are reversible, they are going forward and backwards all the time Reversible Reaction Example A + B  C ARROWS FOR REVERSIBLE REACTIONS Both products and reactants are present http://www.youtube.com/watch?v=LMIbJ-B92Ho&feature=related

Chemical Equilibrium When the rate of the forward and reverse reactions are equal.

How does equilibrium look? The relative concentrations of reactants and products when they reach equilibrium

Objective 2 Describe how the rate of chemical equilibrium will shift when altering the various environmental and physical conditions.

Real-World Example The Human Body is AMAZING!!! Did you know that your body works to maintain dynamic equilibrium constantly. Cells-Nutrients flowing in/out Breathing-CO2 and O2 Bloodstream-HCO3- /CO32- Temperature Regulation

Le Chatlier’s Principle If a dynamic equilibrium is disturbed by changing the conditions (adding stress), the position of equilibrium moves to counteract the change.

Le Chatelier’s Principle What factors effect the equilibrium of a reaction? Changing concentration Changing pressure Changing temperature These all produce a SHIFT in the equilibrium of a reaction A SHIFT means that either more reactants or products are produced

Exit Slip: Equilibrium Title your paper “Exit Slip: Equilibrium” Write your name, date, and period. Number your paper 1-4 

Classwork You are to work on the worksheet you received at the beginning of the class period.

Exit Slip: Equilibrium 2H2O2  2H2O + O2 + Heat If I add heat, to which side will the eq. shift? If I remove heat, to which side will the eq. shift? If I add more H2O2, to which side will the eq. shift? If I add more O2, to which side will the eq. shift?