Episode 25 starts with the definition of a catalyst and describes how we can identify the catalyst in a set of elementary steps (1:22). Catalysts work by increasing the number of successful collisions, by providing a pathway with a lower activation energy (2:18) or by providing an intermediate with more favorable orientation (2:50). Catalysts can be homogenous, hence in the same phase, or heterogenous in different phases (4:04). Enzymes are bio-catalysts (5:12).
Question: (5:53) Which of the following solid catalysts is most effective?
A. Fine powered nickel
B. Granular nickel
C. inch-long nickel
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