Unit 3 AOS 2 - Catalysts and Reaction Pathways Quiz (1B)

What is the primary role of a catalyst in a chemical reaction?

• To increase the temperature of the reaction

• To increase the rate of the reaction

• To change the equilibrium position of the reaction

• To increase the concentration of reactants

How does a catalyst affect the activation energy of a reaction?

• It increases the activation energy

• It decreases the activation energy

• It has no effect on the activation energy

• It doubles the activation energy

Which of the following best describes an energy profile diagram for a catalysed reaction?

• The diagram shows a higher peak than the uncatalysed reaction

• The diagram shows a lower peak than the uncatalysed reaction

• The diagram shows the same peak as the uncatalysed reaction

• The diagram shows no peak

In an energy profile diagram, what does the peak of the curve represent?

• The energy of the reactants

• The energy of the products

• The activation energy

• The overall energy change of the reaction

What is an alternative reaction pathway in the context of catalysis?

• A pathway that requires more energy

• A pathway that requires less energy

• A pathway that does not involve reactants

• A pathway that does not produce products

Which of the following is NOT a characteristic of a catalyst?

• It is consumed in the reaction

• It provides an alternative reaction pathway

• It lowers the activation energy

• It increases the rate of reaction

What happens to a catalyst at the end of a reaction?

• It is transformed into a product

• It remains unchanged

• It is used up completely

• It becomes a reactant

Which of the following is a common example of a catalyst in biological systems?

• Water

• Enzymes

• Oxygen

• Carbon dioxide

In a catalysed reaction, how does the rate of reaction compare to the uncatalysed reaction?

• It is slower

• It is faster

• It is the same

• It stops completely

Which of the following statements is true about catalysts?

• Catalysts are specific to particular reactions

• Catalysts increase the energy of the products

• Catalysts are always in the same phase as the reactants

• Catalysts are only used in industrial processes