chem 2 exam 1 fall 02 - CHEM 2 NAME MIDTERM 1 FALL 02 DATE...

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CHEM 2 MIDTERM 1 FALL 02 NAME_____________________ DATE: INSTRUCTOR (circle): Voloshchuk Zhang SHOW ALL WORK USE CORRECT UNITS AND SIGNIFICANT DIGITS YOU MAY SHOW YOUR WORK ON THE BACK OF THE SHEET, BUT INDICATE YOUR ANSWER ON THE FRONT 1. (5 points) Indicate whether each of the following statements is true or false: T F __ __A catalyst can change the equilibrium constant of a reaction. __ __A catalyst can change the activation energy of a reaction. __ __Chemical equilibrium occurs when opposing reactions proceed at equal rates. __ __A system is always at equilibrium when the reaction quotient equals the equilibrium constant. __ __A Lewis acid can never act as a Bronsted-Lowry acid. __ __Increasing the concentration of a weak acid increases its percent ionization __ __The equivalence point of a weak acid titrated against a strong base is basic. __ __All indicators change color when a solution is at neutrality. __ __Ammonia and ammonium chloride can be used to construct a buffer solution.
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