a) [Potential Energy Diagrams for Exo and Endothermic Reactions], print out and take notes on or use space below
b)Video on Energy in Chemical Reactions, [Energy and Chemical Reactions]
General Note - ALL CHEMICAL REACTIONS REQUIRES CHANGE IN ENERGIES
PER - Potential Energy of Reactant , PEP - Potential Energy of Product
Endothermic Reaction (PER > or < or = PEP) -
Exothermic Reaction (PER > or < or = PEP) -
Activation Energy ( E ac )-
Heat of Reaction -
Procedure for lab:
1. Add 1/2 teaspoon of barium hydroxide ( Ba1(OH)2 (s) ) to a 100 ml beaker. Make (record) observation of chemical.
2. Add 1/2 teaspoon of ammonium chloride ( NH4Cl1 (s) ) to this beaker. Make (record) observation of chemical before adding.
3. Using a large stirring rod, stir until reaction stops. Record observation as you are stirring. Make sure to feel the bottom of the beaker.
4. Clean-up: Dilute all material in the beaker and pour down sink. Then follow regular lab clean-up procedures.
Chemical Reaction (We will work on in class):