Ch. 6 & 7   atomic structure & periodic trends     test              75 points                                  AP Chem

Show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

Academic Honesty:   The answers on this test are my own and I am using only the allowed set of notes as described in the syllabus.  I have not discussed the test questions with anyone before or during the test nor have I seen the test questions prior to the exam.  If you violate any of the preceding items or do not sign, your semester grade is a F.

                                                                                                Signature:  ___________________

 1. Sketch the PES spectrum of He and Li, then rationalize the relative energy associated with the 1s AO in both atoms.  Label each signal and both axis in the spectrum, including if you’re using a descending or ascending horizontal scale.  [10 points]

2. Describe / rationalize the relative first ionization energy of the atoms in the fourth row in the periodic table; include all exceptions.  [20 points]

3. Based on the below data table

[chemical]; mM

Light intensity (photons / second)

0

660

20

380

40

220

60

130

80

75

Unknown

160

sketch / label a graph to estimate the concentration of the unknown chemical.  [15 points]

4. A metal is exposed to light of a wavelength of 120. nm and the kinetic energy of the emitted electron is 1.65 * 10-18 J.  What is the range of the wavelength for the photoelectric effect to be seen in this metal ?  [20 points]

5.  Describe / rationalize the hydrogen visible light emission spectrum.  [10 points]