quiz10s10 - CHEMISTRY 419 QUIZ 1 NAME: Spring, 2010 (2103)...

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[Numbers without decimal points are considered infinitely precise. Show reasonable significant figures and proper units. Answers should be in reasonable units for the quantity.] 1. (5 points) In the following table, insert the letter of the best possible definition from column b before the word in column a. (There is only one best answer for each.) Column a Column b __a 1. Fick’s second law a. Concentration change due to diffusion __i___ 2. Flux b. Condition in which solvent molecules interact weakly with a solute particle __c__ 3. Perrin factor c. Determines the frictional properties of nonspherical particles __f__ 4. Prolate ellipsoid d. Diffusion of a spherical particle __g__ 5. Random walk e. Means of carrying out faster sedimentation than by gravitation __j__ 6. Sedimentation coefficient f. Model obtaining by rotating an ellipse around the major semi-axis __b__ 7. Slip condition g. Model that uses a series of steps, with each being uncorrelated with the previous one __d__ 8. Stokes-Einstein equation h. Proportionality between flux and gradient __h__ 9. Transport coefficient i. Quantity transferred through a given area per unit time __e__ 10. Ultracentrifugation j. Usually reported in svedbergs 2. (5 points) When two dice are thrown, what is the random probability that both of them land with the six showing (i.e., what is the probability of throwing “boxcars”)? The probability that one die will show a six is 1/6. The probability that the second die will show a six is 1/6. The probability that both will show a six is the product of these two: P = p 1 p 2 = (1/6) (1/6) = 1/36 CHEMISTRY 419 Spring, 2010 (2103) QUIZ 1 February 18, 2010 NAME: KEY ONE Score ______/10
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[Numbers without decimal points are considered infinitely precise. Show reasonable significant figures and proper units. Answers should be in reasonable units for the quantity.] 1. (5 points) Calculate the pressure drop from one end of the aorta ( r = 1 cm) to a point that is 1.00 cm away, using the fact that blood flows at a rate V / t = 0.08 dm 3 s -1 and the viscosity of blood is 4.00 centipoise at a temperature of 310 K. This is an application of Poiseuille’s law (and is example 24.16 in your book). A rearrangement of Poiseuille’s gives the equation: t V r L P 4 8 Substitution of parameters from the problem into this equation, making sure they are all in SI units, gives Torr atm Pa s m m m s m kg P 3 6 3 3 4 2 2 1 1 3 10 11 . 6 10 04 . 8 815 . 0 1 10 08 . 0 ) 10 00 . 1 ( ) 10 00 . 1 )( 10 00 . 4 ( 8 2. (5 points) The self-diffusion coefficient of liquid water at 298.15 K is 2.25x10 -9 m 2 s -1 . Your Handbook gives the viscosity of pure water. Using these data, estimate the size of a water molecule, assuming it to be a spherical particle of radius r . (HINT: Assume that all equations work for all particles, regardless of size.) Use the Stokes-Einstein equation (slip conditions) to estimate the radius: D kT r  4 . Putting in data gives the following equation: nm m s m s m kg K K J r 164 . 0 10 64 . 1 ) 10 25 . 2 )( 10 937 . 8 ( 4 ) 15 . 298 )( / 10 3806505 . 1 ( 10 1 2 9 1 1 4 23
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quiz10s10 - CHEMISTRY 419 QUIZ 1 NAME: Spring, 2010 (2103)...

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