Intro to the Course. CHEM-5181 Mass Spectrometry, Chromatography, and Computer Programming

Transcription

1 Intro to the Course CHEM-5181 Mass Spectrometry, Chromatography, and Computer Programming Profs. Paul J. Ziemann & Jose L. Jimenez University of Colorado-Boulder Last update: Aug Introduction to CHEM-5181 Distribute Clickers as people come in If you borrow a clicker, you are responsible for returning a working clicker to me (@ end, or if you drop) or an Incomplete Grade will be assigned until you do Round of introductions Name, background, interests related to class Are you registered? Let me know about adds / drops Go through the Syllabus Boot camp for 1 st years: skills for research History of course, updates for this year Register clickers ( roll call ) 2 1

2 Precision vs. Accuracy I Y X Measure two variables E.g. concentration of Na + and Cl - in seawater Accepted value at origin 3 Clicker Test: Precision vs. Accuracy A B C D CQ: Which is the most precise? A B C D I don t know 4 2

3 Precision vs. Accuracy III A B C D CQ: Which is the most accurate? A B C D I don t know Follow up: Which is better, A or B? 5 Precision Precision vs. Accuracy IV Agreement between two or more measurements made in an identical fashion Accuracy Accuracy is the nearness of a measurement to the accepted value CQ: This measurement is A. Accurate B. Precise C. Precise and Accurate D. Neither E. I don t know 6 3

4 Action Items for you Get tetbooks (by today) Fill Doodle Poll for office hrs (by Thu) Piazza bulletin board: sign up (by today) ALL class announcements will go there ALL questions should go there unless they are of a personal nature (e.g. you are sick) Igor and Labview software Install IGOR in your laptops (by today) Go through IGOR tutorials (by Thu) Bring laptops to class on Thu and for all programming-related lectures Make sure you can connect to VGA display, and set resolution to Do reading and HW for Thu 7 Other Items Please erase board & turn on projector before class Silence your cell phone & laptop (and remind me to silence mine!) Suggestions during the course Questions? 8 4

5 Random errors are often distributed according to the normal error law Probability Density Normal Probability Density Function Absorbance (unitless) CQ: the probability that the absorbance is eactly 0.49 is: A B. 25 C. infinity D. zero E. I don t know CLT: 9 PDF vs CDF Probability Density vs. Cumulative Probability Probability Density Normal Probability Density Function Cumulative Probability Normal Cumulative Probability Function Absorbance (unitless) Absorbance (unitless) CQ: the probability that the absorbance is between 0.48 and 0.49 is: A. zero B. It is not defined C D E. I don t know 10 5

6 What is the strength of the electric field between two parallel plates at 1000 and 1000 V with respect to ground, if they are separated by 5 mm? A Tesla B. 400,000 Volts/meter C. Zero D. 400,000 Newtons/Coulomb E Coulombs 11 Clicker Q What is the strength of the electric field between two parallel plates at and V with respect to ground, if they are separated by 5 mm? A. -400,000 Newtons/Coulomb B. +400,000 Newtons/Coulomb C. +200,000 Newtons/Coulomb D. Zero E. I don t know 12 6

7 What is the force acting on a singly charged (+) potassium ion with zero velocity in a 1 Tesla magnetic field A. 1 Newton B Newtons C. Zero D. It depends on the relative alignment E. I don t know Clicker Q What is the net electric force on a neutral mercury atom in an electric field of 10 6 V/m? A. It depends on the polarizability of Hg B Newtons C Newtons / meter D. Zero E. I don t know 14 7

8 What is true for the distribution of molecular speeds of N 2 at ambient T & P A. The average speed is ~472 m/s B. The minimum speed is 0 m/s C. The maimum speed is not bound D. None of the above E. A, B, and C 15 Clicker Q The average thermal speed of SF 6 at ambient T & P is A. Smaller than that of N 2 B. Larger than that of N 2 C. Same as that of N 2 D. None of the above E. A, B, and C 16 8

9 Each air molecule in this classroom is colliding with others approimately: A. Once a second B. 100 times per second C. 10,000 times per second D times per second E times per second 17 Clicker Q The time between collisions for an individual air molecule in an ionizer at a pressure of 10-4 mbar is approimately: A. 0.1 ns B. 1 s C. 100 s D. 1 ms E. 3 s 18 9

10 What is the vapor pressure of water at 100 degrees C? A Torr B. 760 mbar C. 1 bar D. 1 atmosphere E. 15 Torr 19 Kinetic Theory of Gases