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Which of the following statements about catalysis are true? 1) Catalysts are substances that change the...

Which of the following statements about catalysis are true? 1) Catalysts are substances that change the rate of a chemical reaction, either speeding it up or slowing it down. 2) Because many biologically important reactions are very slow, living organisms rely on a class of catalysts called enzymes to increase the rate of biochemical reactions. 3) In heterogeneous catalysis, the catalyst and the substrate are always in different phases.

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