Catalysts (AQA A-Level Chemistry): Flashcards
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What is a catalyst?
What is a catalyst?
Substance that increases reaction rate without being used up or chemically changed
Does a catalyst change chemically?
Does a catalyst change chemically?
No - remains unchanged in composition and amount
How catalysts increase reaction rate
How catalysts increase reaction rate
Provide alternative pathway with lower activation energy
Effect of catalyst on activation energy
Effect of catalyst on activation energy
Lowers it
Activation energy () definition
Activation energy () definition
Minimum energy for successful collision to form products
Why does lowering speed up reaction?
Why does lowering speed up reaction?
More molecules now have energy
Maxwell-Boltzmann curve shape with catalyst
Maxwell-Boltzmann curve shape with catalyst
Unchanged (temperature and molecule number same)
Effect of catalyst on collision rate
Effect of catalyst on collision rate
Increases rate of successful collisions
Industrial catalyst example
Industrial catalyst example
Haber process for ammonia synthesis
Biological catalysts
Biological catalysts
Enzymes