Rates of Reactions (LC 2027) (Leaving Cert Chemistry): Quizzes
📚Quizzes
Practise the questions
14 questions from this quiz
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Practise the questions
14 questions from this quiz
What is the key characteristic of a catalyst after a chemical reaction?
What is the key characteristic of a catalyst after a chemical reaction?
It is recovered chemically unchanged
How much catalyst is typically needed to have a significant effect on reaction rates?
How much catalyst is typically needed to have a significant effect on reaction rates?
Tiny quantities
Which enzyme in liver cells specifically catalyses the breakdown of hydrogen peroxide?
Which enzyme in liver cells specifically catalyses the breakdown of hydrogen peroxide?
Catalase
What defines homogeneous catalysis?
What defines homogeneous catalysis?
Catalyst and reactants in same phase
In heterogeneous catalysis, where do the reactions typically occur?
In heterogeneous catalysis, where do the reactions typically occur?
At active sites on catalyst surface
What phase is the catalyst usually in during heterogeneous catalysis?
What phase is the catalyst usually in during heterogeneous catalysis?
Solid
Which theory explains catalysis by forming temporary intermediate compounds with reactants?
Which theory explains catalysis by forming temporary intermediate compounds with reactants?
Intermediate formation theory
In surface adsorption theory, what is the first stage called?
In surface adsorption theory, what is the first stage called?
Adsorption
What is autocatalysis?
What is autocatalysis?
A product acts as the catalyst
How does catalyst poisoning occur?
How does catalyst poisoning occur?
Poisons bind strongly to active sites
Which of these is a common catalyst poison mentioned in the notes?
Which of these is a common catalyst poison mentioned in the notes?
Lead compounds
Which metals are used as catalysts in catalytic converters?
Which metals are used as catalysts in catalytic converters?
Platinum, palladium, rhodium
What does a catalytic converter convert carbon monoxide into?
What does a catalytic converter convert carbon monoxide into?
Carbon dioxide
Why is lead-free petrol essential for vehicles with catalytic converters?
Why is lead-free petrol essential for vehicles with catalytic converters?
Lead poisons the catalyst