Catalysts (VCE SSCE Chemistry): Flashcards
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Definition of catalysts
Definition of catalysts
Increase reaction rate without being consumed in the process
How catalysts lower activation energy
How catalysts lower activation energy
Provide alternative reaction pathway with lower
Do catalysts change ?
Do catalysts change ?
No, only affect rate not enthalpy change
Homogeneous catalysts
Homogeneous catalysts
Same physical state as reactants/products
Heterogeneous catalysts
Heterogeneous catalysts
Different physical state to reactants/products
Why heterogeneous catalysts preferred in industry
Why heterogeneous catalysts preferred in industry
Easier separation, reusable, withstand high temperatures
Why surface area important for heterogeneous catalysts
Why surface area important for heterogeneous catalysts
Larger surface = more adsorption sites = faster reactions
What is adsorption?
What is adsorption?
Reactant molecules form bonds with catalyst surface
Metals used in catalytic converters
Metals used in catalytic converters
Platinum, palladium, and rhodium
Catalyst in Haber process
Catalyst in Haber process
Powdered iron