Sample2 - Chem 6 Sample exam 2 (150 points total) @ This is...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 6 Sample exam 2 (150 points total) @ This is a closed book exam to which the Honor Principle applies. @ The last page contains equations and physical constants; you can detach it for easy reference. @ Please write clearly and SHOW YOUR WORK. If you need to write on the back of the exam paper, please indicate this clearly. @ Some questions are more challenging than others. Allot your time accordingly, and try to answer EVERY question. @ Please put your name both on this page and on page 2. NAME: _________________________
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 NAME: ____ ________ ________ FOR GRADING USE ONLY Question 1 (12 pts). ....................... __________ Question 2 (15 pts). ....................... __________ Question 3 (16 pts). ....................... __________ Question 4 (16 pts). ........................ __________ Question 5 (12 pts). ..................... __________ Question 6 (12 pts) . ....................... __________ Question 7 (15 pts) . ....................... __________ Question 8 (12 pts) . ....................... __________ Question 9 (12 pts) . ....................... __________ Question 10 (28 pts) . ....................... __________ TOTAL (150 pts) ...................... ===========
Background image of page 2
3 1. (12 pts, 6 each) Hydrogen atoms are the overwhelming majority of atoms in most stars and in interstellar space. In the Carina nebula, transitions due to H atoms in extremely excited states are observed. For example, the n = 253 ---> n = 252 transition has been studied by astronomers. a. (8 pts) Find the frequency of the photon emitted in this transition . Be sure to include appropriate units. b. (4 pts) At least one article suggests that the H atom involved in this transition is big enough to be seen by the unaided eye (if you were spacewalking right next to it in this nebula). Find the radius of the H atom in the n = 253 state . Be sure to include appropriate units. Could you see this atom, or is that just exaggeration?
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 2. (15 pts). Consider an electron in a C=C double bond, which we can model as a 1-dimensional box of length 1.34 Å. Find the wavelength of light (please include appropriate units) necessary to excite the electron from its ground state to the first excited state.
Background image of page 4
5 3. (16 pts) Consider the zero-point energy (ZPE) of two different electrons. One is in a H atom, and the other is in a one-dimensional box. Find the length of the box (L; include appropriate units) so that the magnitude of the ZPE for its electron is equal to the magnitude of the ZPE for the electron in the H atom: Explain your answer. ZPE (box) ZPE (atom) =
Background image of page 5

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

View Full DocumentRight Arrow Icon
6 4. (16 pts) Here are two different representations of the hydrogen 2s and 3s orbitals, showing the square of the wavefunction and "slices" of the three- dimensional electron density.
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 15

Sample2 - Chem 6 Sample exam 2 (150 points total) @ This is...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online