Exothermic and Endothermic Reactions
-chemical reaction involves change in energy (Delta H)
-exothermic (release of energy)
-endothermic (absorb energy)
-eg. instant ice pack (endothermic)
explosion (exothermic)
Molecules held together by chemical bonds
-add energy to break bonds
-release energy to form bonds
Exothermic
-reactant's energy > product's energy
-energy is released during the chemical reaction
Endothermic
-reactant's energy <>-energy is absorbed during the chemical reaction
Enthalpy(the heat within a contained system)
- (product's energy) - (reactant's energy) = Delta H
+ Delta H ==> Endothermic
- Delta H ==> Exothermic
Energy Diagram
-allows to chart potential energy and the product's energy
-the Energy is based on Delta H
Important Terms
-Potential Energy (kJ) y intercept
-Reaction Progress x intercept
-Activated complex = the peak of every energy diagram
-Activation Energy = the energy required from reactant to activated complex
Some helpful videos
Endothermic and Exothermic Reactions
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