Mid1A - Chemistry 6BL EXAM #1 FORM A, Fall Quarter 2007...

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Chemistry 6BL EXAM #1 FORM A, Fall Quarter 2007 Answer Key "Short" Questions (3 points): 1) In the formula for the Q-Test (shown below), x and y represent: | ue lowest val - lue highest va | | y - x | Q = a) outlier, average of values b) outlier, value closest to outlier c) outlier, lowest value d) outlier, highest value e) outlier, value farthest from outlier 2) What is the proper relationship between pK a and pH at 1/3 the equivalence point? a) pK a = pH b) pK a = pH - log(3) c) pK a = pH - log(2) d) pK a = pH - log(1/2) e) pK a = pH - log(1/3) 3) Why are the "equivalence point" and the "end point" not always the same? a) Because the "equivalence point" only indicates when the indicator changes color b) Because the "end point" only indicates when the indicator changes color c) Because the "end point" of an indicator varies with pH, while the "equivalence point" does not d) Because there is no "equivalence point" in redox titrations e) Trick question! They are always the same thing! 4) What is the answer to (21.301 + 3.3 + 7.89) using the correct number of significant figures? a) 32.491 b) 32.49 c) 32 d) 32.5 e) 32.4 5) Which of the following is a true statement about "Redox" reactions? a) The reduced species gains electrons
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Mid1A - Chemistry 6BL EXAM #1 FORM A, Fall Quarter 2007...

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