What does a catalyst do to a chemical reaction? a. A catalyst will increase the yield of a chemical reaction. b. A catalyst will "kick-start" a reaction that is at equilibrium. c. A catalyst will reverse the direction of a chemical reaction. d. A catalyst will alter the products of a reaction. e. A catalyst will increase the rate of a chemical reaction. What is the purpose of the salt bridge in an electrochemical cell? a. A pathway by which counter ions can flow between the half-cells without the solutions in the half-cells totally mixing. b. A pathway for electrons to flow. c. A pathway in which no ions flow. d. A pathway between the cathode and anode in which ions are reduced. e. A pathway between the cathode and anode in which ions are oxidized.