Ch1b09Lecture04

Ch1b09Lecture04 - Jim Heath 16 Noyes [email protected] 1 A...

Info icon This preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Jim Heath 16 Noyes [email protected]
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 A few comments: 1. You won’t have to memorize much, if anything (this is not biology) 2. If you do your work, pass the big exams, and if your application to Caltech was legitimate, then you will pass 3. Lecture notes are VERY important!! For part 1 of this course, the powerpoint presentations of the lectures will be posted after each class (in pdf form). I may also occasionally post written lecture notes that should help focus your studying. OGN is a big, amorphous book – it has good problem sets, but it covers too much material. 4. I will highlight many of our lectures by placing them into the context of real science that is being done at Caltech and elsewhere. I will cover what is important about these chemistry in context examples, and you will be asked about them regularly on quizzes.
Image of page 2
3 Please ask questions!!! Stop me and raise your hand if you don’t understand something. If you have a question, chances are about 30-80% of the people in the room have the same question. The ones who fully understand this material are not present in this room because they are not taking this course.
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
4 Leonardo Da Vinci Prof Heath - Why do you think that the students don’t ask questions? Hmmm, Leo. Perhaps they are a little bit embarrassed to speak up? They don’t want to look lost in the presence of so many bright Caltech classmates?
Image of page 4
5 Leonardo Da Vinci Well probably they also are just polite and don’t want to rudely to interrupt you? A possibility, Leo. However, interrupting me with questions is ALWAYS ok.
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
6 Fri & next week Today & tomorrow & Thursday Also, Mass spectrometry next week
Image of page 6
7 Spectroscopy Units wavenumbers cm -1 A wavenumber is simply 1/ λ , with λ in cm’s. Recall that Energy = E = h ν = hc/ λ , so 1/ λ (= cm -1 ) is an energy ν , or frequency (cycles per second) is also an energy c 3.0×10 10 cm·s -1 = 3.0e10 cm·s -1 = speed of light in vacuum h = 6.626e-34 J·s (kg m 2 s -1 ) = Planck’s constant B E Light is electromagnetic radiation λ time (wavelength)
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
8 Spectroscopy Units wavenumbers cm -1 A wavenumber is simply 1/ λ , with λ in cm’s. Recall that E = h ν = hc/ λ , so 1/ λ (= cm -1 ) is an energy ν , or frequency (cycles per second) is an energy Also, electron volts eV 1 eV 8000 cm -1 = 1.6e-19 J 1 eV is the kinetic energy an electron has after being accelerated through a 1 volt electric field Visible light 13000 – 25000 cm -1 1.5 – 3 eV eV’s are a manageable unit for describing visible & UV light and hence chemical bond energies c 3.0×10 10 cm·s -1 = 3.0e10 cm·s -1 = speed of light in vacuum h = 6.626e-34 J·s (kg m 2 s -1 ) = Planck’s constant
Image of page 8
9 The photon absorption or photon emission spectrum of a molecule is discreet, or quantized True for NMR, rotational spectroscopy, infrared spectroscopy, and electronic spectroscopy Absorbance or emission λ , cm -1 , s -1 , or eV’s WHY?
Image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern