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<center><b>Mini-Lab: Endothermic and Exothermic Reactions</b></center><br> <center>Energy in Chemical Reaction Notes and Lab Procedures</center><br> <br> <u>Notes on Energy in Chemical Reactions.</u> <br> a) [http://www.tmcleod.org/Level1/Chem328Intro/PotentialEnergyDiagram.pdf Potential Energy Diagrams for Exo and Endothermic Reactions], print out and take notes on or use space below<br> b)Video on Energy in Chemical Reactions, [https://www.youtube.com/watch?v=5FzerUQBRwo&feature=youtu.be Energy and Chemical Reactions] <br> <br> <b>General Note - ALL CHEMICAL REACTIONS REQUIRES CHANGE IN ENERGIES</b><br> <br> PE<sub>R</sub> - Potential Energy of Reactant , PE<sub>P</sub> - Potential Energy of Product<br> <br> <i>Endothermic Reaction (PE<sub>R</sub> > or < or = PE<sub>P</sub>) -</i><br> <br> <i>Exothermic Reaction (PE<sub>R</sub> > or < or = PE<sub>P</sub>) -</i><br> <br> <i>Activation Energy ( E <sub>ac</sub> )-</i><br> <br> <i>Heat of Reaction -</i><br> <br> Other notes:<br> <br> <br> <br> <br> <br> <br> <u>Procedure for lab: </u><br> <br> 1. Add 1/2 teaspoon of barium hydroxide ( Ba<sub>1</sub>(OH)<sub>2 (s)</sub> ) to a 100 ml beaker. Make (record) observation of chemical.<br> 2. Add 1/2 teaspoon of ammonium chloride ( NH<sub>4</sub>Cl<sub>1 (s)</sub> ) to this beaker. Make (record) observation of chemical before adding.<br> 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.<br> 4. Clean-up: Dilute all material in the beaker and pour down sink. Then follow regular lab clean-up procedures.<br> <br> <b>Chemical Reaction (We will work on in class):</b><br> <br> <br> <P style="page-break-before: always">
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