factors affecting rxn rates nature of reactants temperature concentration surface area catalysts/...
DESCRIPTION
Catalyst Catalysts speed up reactions. (enzymes) Inhibitors slow down reactions (preservatives) InhibitorsTRANSCRIPT
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Factors Affecting RXN Rates
• Nature of Reactants• Temperature• Concentration• Surface Area•Catalysts/ Inhibitors
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Catalyst•Catalysts speed up reactions. (enzymes)
•Inhibitors slow down reactions (preservatives)
Inhibitors
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Catalyst / Inhibitors•A substance NOT permanently changed during the reaction.
•Changes energy needed to start reaction
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Catalytic converter
•Enzymes
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Activation Energy
•Energy needed to start reaction
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Energy Diagram
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Heat of Reaction: H• Difference between the STORED
Energy of the products and energy of the reactants
H = PEp - PErproducts reactantsChange in heat
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Endothermic reaction•Energy is absorbed (in).
•Surroundings get colder
•Eproducts > Ereactants
•▲H is positive
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Products have more Energy
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Exothermic Reaction•Energy is released (out)
•surrounding get hotter
•Ereactants > Eproducts
•▲H is negative
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Products have less Energy
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Catalyzed Reactions d9 c23
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Hydrogen peroxide Rxt.C34
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Catalyst•Works by changing the activation energy required
•The lower the Ea the greater the rate of the reaction.
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Inhibitors d9 c38
•Works by changing the activation energy required
•The greater the Ea the lower the rate of the reaction.
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Energy Diagram
Inhibitors
Ea
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