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Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

What is a number added in front of a formula in order to balance the equation

What two categories of toxins were present in the air at dish,texas as a result of the gas pipelines that pass through the area