ch. 7 & 8 atomic structure / periodicity; Lewis structure / VSEPR       75 points                               AP chemistry

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.

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In problems involving any calculation, 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.

 1. Sketch the ___ AO and clearly show it’s relationship to the x-, y-, & z- axises when appropriate.  [4 points]

a.  px

b. dxy

2. sketch the orbital diagram for ___; use the ‘bracket short-hand’ notation, the clearly identify all valence- and core- electrons.  [6 points]

a. Sulfur

b. Tin

3. Which atom ___ has the larger atomic size ?  justify.  [10 points]

a. Sodium versus potassium

b. Bromine versus arsenic

4. An incident light with a wavelength of 525 nm shone onto a hypothetical (?) metal has a minimum frequency of 4.75 * 10 14 Hz for the photoelectric effect to happen.  [10 points]

a. Does the photoelectric effect happen ?  justify.

b.  If the photoelectric effect is present, then what is the kinetic energy of the emitted electrons ?

5. What is the relative first ionization energy between  __; justify.  [10 points]

a. Boron versus beryllium

b. Phosphorus versus sulfur

6. Sketch the molecule ___; include its bond angle(s) and the name of the shape of the molecule.  [10 points]

a. PCl3

b. Nitrate ion

7.  In regards to the monovalent anion, SiNO-,  [15 points]

a. sketch all potential Lewis structures

b. redraw the Lewis structures and write the formal charge of each atom near it.

c. select the best Lewis structure(s); justify.

8. Old topic:  draw the five isomers of an alcohol containing a pentyl group.  [10 points]