Multiple-choice questions (9 points for correct answers, 3 points for participation)
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The correct description of the catalyst is (C). (A) Catalysts can speed up reaction rates, but their amount keeps decreasing. (B) Catalysts are continuously involved in the reactions during use and eventually turn into other compounds. (C) Catalysts not only speed up reaction rates but also remain unchanged in terms of their properties and quantity before and after the reaction. (D) Catalysts can only speed up reaction rates
(C) Catalysts not only accelerate the reaction rate, but their properties and quantity remain unchanged before and after the reaction
From a microscopic perspective, a catalyst should also be involved in the reaction; it acts as a mediator that transports substances from reactants to products. However, after completing its task, it returns to its original state, so it can be considered not to be involved in the reaction.
(C) Catalysts not only accelerate the reaction rate, but their properties and quantity remain unchanged before and after the reaction
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