3) As a general rule multiple extractions areless efficient than a single extrac

Question

3) As a general rule multiple extractions areless efficient than a single extraction of the same totalvolume.

    A)true       B)false     C) depends on the substance beingextracted     D) depends on the extractingsolvent

4) Venting of a separatory funnel after shaking isnecessary _________________.

   A) to release excesspressure                      B) to maximize the extent of extraction

   C) to allow the two layers toseparate       D) none ofthese

5) Which of the following statements is true fornucleophilic sunstitution competition experiments?

   A) All of the kinetic variables are heldthe same except for one.

   B) One can determine the absolute value fora single variable.

   C) One can determine the relative effect ofa single variable.

D) Both (A) and (C) are correct.

Explanation / Answer

(3)As a general rule multiple extractions are lessefficient than a single extraction of the same totalvolume.(FALSE)
(4)A separating funnel contains two immiscible solvents that havemixed together by shaking in the sealed apparatus. During thisprocess there is a build up gas in the separating funnel, whichMUST be released.So , the pressure must be high. So , to release excess pressure  Venting of aseparatory funnel after shaking is necessary .( option(A) ) . (5) D) Both (A) and (C) arecorrect                 

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