Energy in Rxns & Potential Energy Diagrams

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Presentation transcript:

Energy in Rxns & Potential Energy Diagrams Thermodynamics

Heat is energy that flows from….. An area of high temperature to an area of lower temperature.

Why does the ice pack feel cold? Where does the energy flow?

Heat Energy and Chemical Rxns System absorbs Energy from the surroundings (the temp of the surroundings decreases) endothermic System releases Energy to the surroundings (the temperature of the surroundings increases) exothermic

Endothermic Rxns Where does this energy come from? The surroundings 540KJ + A + B  C + D Where does this energy come from? The surroundings Where does it go? Into the system C & D E is a reactant E is absorbed

Exothermic Rxns Where did this energy come from? The system A & B A + B  C + D + 540KJ Where did this energy come from? The system A & B Where does it go? The surroundings E is a product E is released

Endothermic Reaction Energy of the Activated complex (transition state) Activation Energy Energy of products Enthalpy ∆H Potential Energy (KJ) Energy of reactants Reaction time (s)

Exothermic Reaction Energy of the Activated complex (transition state) Activation Energy Energy (KJ) Er ∆H Enthalpy Ep Reaction time (s)

These graphs are Reversible and can be read in the forward direction  and in the reverse direction

In truth…. Reactions take place in a series of steps. Some steps are endothermic and some exothermic. The can be added into an overall. E1 Transition state intermediate E2 Transition State intermediate Transition state product E3

The End