KSU CHEM 230 Lab Exam 1 Questions With Complete Solutions

What four factors affect reaction rates? correct answer: -concentration of reactants -Temperature -Catalysts - Physical state of reactants relationship between reaction rate and activation energy correct answer: The higher the activation energy, the slower the reaction rate Effect of catalysts on reaction rates, why does this happen? correct answer: Catalysts speed up reaction rates because it lowers the activation energy What is an autocatalysis? correct answer: The reaction is catalyzed by one of its products. What is the meaning of the terms "first order" and "second order" in a reaction rate law? correct answer: The rate law is Rate = k[A]X[B]Y and the X and Y represent the stoichiometric ratio in the "rate-limiting" step. Which then determines if it is a first order or a second order. Understand why the concentration of hydroxide had to be much higher than the concentration of crystal violet correct answer: the concentration of hydroxide had to be much higher than crystal violet in order to break the single and double bonds and the central carbon atom of crystal violet. which made is colorless. (why we found the absorbance) zero order correct answer: m/s first order correct answer: s-1 second order correct answer: correct answer: Write the equilibrium constant expression for Fe3+ + SCN- --> Fe(SCN)2+ correct answer: K= [FeSCN2+]/ [Fe3+][SCN-] List 5 strong acids correct answer: HCl HBr