CHEM272Exam1S10 - Friedman CHEM272 Exam#1 Spring 2010 Name...

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Friedman Name: CHEM272 Exam #1 TA: Spring 2010 Section: Please show all work in the space provided below the problems. This will particularly help if you are seeking partial credit. You are allowed to use pencil on this exam. All electronic devices, except for a calculator must be stowed properly. Please show all of your work and report your answers with the correct units and number of significant digits. Answers without units will be marked incorrect. Here is some information that you might find useful: Henderson-Hasselbalch Equation pH = pKa + log 10 [ A ] [ HA ] Λি Νয় Μ৏ Ξ৯ Πਏ Ο৿ Here is some information that you might not find useful: Both John Adams and Thomas Jefferson died on July 4, 1826 – fifty years to the day after the signing of the Declaration of Independence. Chuck Norris invented Kentucky Fried Chicken's famous secret recipe, which has eleven herbs and spices. But nobody ever mentions the twelfth ingredient: fear. _____________________________________________________________ Pledge: For c = a * b relativeerrorin c = relativeerrorin a ( ) 2 + relativeerrorinb ( ) 2 For c = a + b errorinc = absoluteerrorin a ( ) 2 + absoluteerrorinb ( ) 2 A = ε bC M 1 V 1 = M 2 V 2
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1) Short answer questions – no explanations needed. a) Which is more precise – a volumetric pipet or a measuring pipet? (5 points) b) In experiment 2A, the CBBG-BSA complex is allowed to stand at 10 minutes prior to the absorption measurement. Will the absorbance at 595 nm taken at 2.5 minutes be lower, the same, or higher than at 10 minutes? (5 points) 2) For the deprotonation of water by the weak base B , derive an expression analogous to the Henderson-Hasselbalch equation that relates the pOH of a solution to the K b value. Clearly circle your final equation. (10 points)
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3) A farmer acquires two tracts of land and wants to measure their dimensions to determine the total combined area. Unfortunately, he continually loses track while measuring these dimensions and the best he can determine is the dimensions with the uncertainties shown below (all numbers given are in miles). (20 points) 16 + _ + _ + _ + _ 1 13 2 11 1 15 2 Based on the dimensions and uncertainties above, and using the error propagation and reporting method(s) we use in class, what is the total area as well as the uncertainty in the total area (report the uncertainty as ± )?
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