quiz 1 answers - CHEM 153L QUIZ 1 FORM A Tuesday October 6...

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CHEM 153L QUIZ 1 FORM A Tuesday, October 6, 2009 NAME: _____ANSWER KEY________ SECTION: ____________ General Instructions: 1. Answers written in with pencil or erasable pen may forfeit any possible regrades. 2. If you have finished early, place your quiz face down and wait till time is called. Do not leave your seat until the quiz is done. 3. Unless specified, multiple-choice questions may have more than 1 correct answer. Circle all that apply. If you select the wrong choice, you will be deducted points – so avoid guessing.
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1. a) How should you be holding the serological pipet when withdrawing from a stock solution? Vertically Straight (+1) b) When dispensing solution from any pipet, how would you ensure that all of the solution comes out of the pipet when you are “blowing out” the remaining solution? Make contact to the receiving container (+1) (increases force of withdrawal by allowing the hydrodynamic force in pulling out the solution – extra explanation for your interest in pipeting) 2. What must you NEVER do when using a piston pipet which could result in costly damage to the equipment as well point deductions to your grade? (Circle all that apply.) a) Lay the pipet horizontally down with the solution still in the tip.
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