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Energy Diagrams: Drawing it Out
![Page 2: Energy Diagrams: Drawing it Out. Why are we learning this? Energy diagrams show how a reaction works.…](https://reader035.vdocument.in/reader035/viewer/2022062911/5a4d1bdb7f8b9ab0599dc750/html5/thumbnails/2.jpg)
Why are we learning this?
Energy diagrams show how a reaction works.
Energy diagrams display The energy of reactants and products The energy needed for a reaction to occur The energy absorbed or released due to
reaction
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Energy Diagram Parts Potential Energy of the reactants Potential Energy of the products Activation Energy E – the amount of energy
required to reach the transition state or activated complex from the reactant
Transition State, Ts (Activated Complex) – when bonds break and form and reactants become products
Enthalpy, H – science word for heat, Energy of products – energy of reactants
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products
Potential Energy
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products
Potential Energy
![Page 10: Energy Diagrams: Drawing it Out. Why are we learning this? Energy diagrams show how a reaction works.…](https://reader035.vdocument.in/reader035/viewer/2022062911/5a4d1bdb7f8b9ab0599dc750/html5/thumbnails/10.jpg)
Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products max
Potential Energy high low
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products max
Potential Energy high low Kinetic Energy
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products max
Potential Energy high low Kinetic Energy
high min low
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Potential and Kinetic Energy Changes during a CollisionEndothermic Reactants Activated Complex Products max
Potential Energy high low Uphill- endothermic! Kinetic Energy
high min low
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Putting Pieces TogetherTransition State, Ts
Energy
Reaction
Reactants
Products
Activation Energy of forward reaction, EF
EF = Ts - ReactantsEnthalpy of forward reaction, HF
HF = Products - Reactants
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Putting Pieces TogetherTransition State, Ts
Energy
Reaction
Reactants
Products
Activation Energy of reverse reaction, ER
ER = Ts - ProductsEnthalpy of forward reaction, HR
HR = Reactants - Products
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Types of Energy Diagrams Endothermic – the reaction absorbs heat so
H is positive The reactants have less potential
energy than the products
A + B
AB
H > 0
A - - - B
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Types of Energy Diagrams Exothermic – the reaction releases heat so
H is negative The reactants have more potential
energy than the products
A + B
ABH < 0
A - - - B
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Types of Energy Diagrams Catalysts lower the activation energy of a
reaction by finding an alternate route. However, the change in heat, or enthalpy is the same.
A + B
ABH < 0
Blue without Catalyst
Green with Catalyst
A - - - B
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Try it together
50
100
150
200
250
Use the numbers to find:
What is EF?
What is HF?
What is HR?
What is ER?
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Pick the slow and fast reaction
Ea Ea
Slow Fast- low Ea