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