Share Facebook Email Telegram WhatsApp Results #1. Catalysts work by _________. Increasing the concentration of reactants Increasing the concentration of reactants Decreasing the rate of reaction Decreasing the rate of reaction Providing an alternative reaction pathway with a lower activation energy Providing an alternative reaction pathway with a lower activation energy Increasing the reaction order Increasing the reaction order #2. A catalyst can ___________ Increase the rate of reversible reaction in both the forward and reverse directions Increase the rate of reversible reaction in both the forward and reverse directions Increase the rate of a reversible reaction only in the forward direction Increase the rate of a reversible reaction only in the forward direction Decrease the rate of a reaction Decrease the rate of a reaction Increase the activation energy of a reaction Increase the activation energy of a reaction #3. Which of the following statements about heterogeneous catalysts is true ? They are always in the same phase as the reachants They are always in the same phase as the reachants They can be easily seperated from the reaction mixture They can be easily seperated from the reaction mixture They are the chemical composition of the reactants They are the chemical composition of the reactants They are highly soluble in the reaction solvent They are highly soluble in the reaction solvent #4. Poisoning of a catalyst refers to _________. Making the catalyst more active Making the catalyst more active Reducing the catalyst's activity by introducing unwanted substances Reducing the catalyst's activity by introducing unwanted substances Increasing the catalyst's selectivity Increasing the catalyst's selectivity Promoting the catalyst's stability Promoting the catalyst's stability #5. Selectivity of a catalyst refers to ________ Its ability to remain unchanged during a reaction Its ability to remain unchanged during a reaction Its ability to promote multiple side reactions Its ability to promote multiple side reactions Its ability to favor the formation of a specific product in a reaction Its ability to favor the formation of a specific product in a reaction Its ability to speed up any chemical reaction Its ability to speed up any chemical reaction #6. Promoters in catalysis are substances that _______. Decrease the catalytic activity Decrease the catalytic activity Enhance the selectivity of the catalyst Enhance the selectivity of the catalyst Increase the reaction rate without being consumed Increase the reaction rate without being consumed Poison the catalyst Poison the catalyst #7. Which of the following factors can influence the effectiveness of a catalyst? Temperature and pressure only Temperature and pressure only Concentration of reactants only Concentration of reactants only Temperature, concentration of reactants , and catalyst particle size Temperature, concentration of reactants , and catalyst particle size Catalyst particle size only Catalyst particle size only #8. Autocatalysis is a phenomenon where ______. The catalyst accelerates its own decomposition The catalyst accelerates its own decomposition The reaction rate increases as the reaction progresses The reaction rate increases as the reaction progresses The catalyst is consumed in the reaction The catalyst is consumed in the reaction The reaction rate remain constant The reaction rate remain constant #9. A homogeneous catalyst is _________. Always in the same phase as the reactants Always in the same phase as the reactants Typically a solid in solution Typically a solid in solution Insoluble in the reaction medium Insoluble in the reaction medium Used exclusively in gas - phase reactions Used exclusively in gas - phase reactions #10. In the manufacture of ammonia (NH3) through the Haber - Bosch process, which catalyst is commonly used ? Platinum Platinum Palladium Palladium Iron Iron Nickel Nickel Finish
