Topic: Potential Energy Curve Do Now: p.26. Spontaneous Processes no outside intervention =physical...
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Transcript of Topic: Potential Energy Curve Do Now: p.26. Spontaneous Processes no outside intervention =physical...
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Topic: Potential Energy Curve
Do Now: p.26
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Spontaneous Processes=physical or chemical change that occurs with no outside intervention
• However, some energy may be supplied to get process started = activation energy
Iron rusting4Fe(s) + 3O2(g) 2Fe2O3(s)
H = -1625 kJ
Combustion CH4(g) + 2O2(g) CO2(g) + 2H2O(l) H = -891kJ
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Can you think of others?
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VIDEO
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Activation Energy
• = Energy needed to initiate reaction
• Energy needed to overcome reaction barrier
• difference between where reactants start & top of hill
• Difference between reactants & activated complex
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Energy Diagram of a ReactionActivated Complex = intermediate formed during conversion from reactants to productsReactants combine to form an unstable complex
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Potential Energy Curve: Endothermic
Products have more P.E. than reactants
Start low, end high
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Potential Energy Curve: Exothermic
Products have less P.E. than reactants
Start high, end low
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Have to label 6 energies on curve: reactants & products
1. PE reactants2. PE products3. PE activated complex4. Ea forward reaction
5. Ea reverse reaction
6. H
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Time
What kind of reaction is represented?
PE reactants
PE activated complex
PE products
Ea forward rxn
Ea reverse rxn
40
30
20
10
Enth
alpy
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H of reaction
40
30
20
10
Enth
alpy
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Time
What kind of reaction is represented?
PE of reactants
PE of activated complex
P.E. of products
Ea forwardrxn
Ea
reverserxn
40
30
20
10
Enth
alpy
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H of reaction
40
30
20
10
Enth
alpy
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Catalyst (in the body = enzyme)
• Substance that increases rate of reaction without itself being consumed –does not participate in reaction
• Lowers the activation energy for the reaction
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DOES IT AFFECT ΔH?Catalysts do not affect ΔH