9. Which one of the following sets of reactants is most likely to have the slowest rate of reaction? a.A covalent compound in solution and an ionic substance in solution. b.Two ionic substances in solution. c.Two solid ionic substances. d.Two covalent compounds in solution. 10. A catalyst that slows down a chemical reaction is known as a, an enzyme b. an inhibitor C. a heterogeneous catalyst d. a converter

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