Ch. 11 & 12  atomic structure & chemical bonds                    test     [70 points]       honors Chem


For problems involving calculations, show your work in an organized manner, include any relevant equation (or formula and conversion factor(s)), put the proper units in your calculations / answer, and have the proper number of significant figures in your answer.                  Clearly identify the problems done and do them in sequence and your answer must begin and end on the same page of paper; otherwise, you may lose points.



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.  What is the periodic trend in the (first) ionization energy in a row of the periodic table ?  justify / rationalize your response.  [15 points]


2.  Define “electron spin” and its implications in regards to electron orbitals.   [10 points]


3.  sketch the __  AO; include the x-, y-, z- axis, as needed, to illustrate their orientation with respect to these axis.  [10 points]


a.  px


b.  dxz


4.  In regards to SF4,  [15 points]


a.  sketch its Lewis structure(s)


b.  sketch the shape of the molecule


c.  what is the name of the shape of the molecule ?  what is / are the bond angles in the molecule ?


5.  In regards to SF4  (see # 4),  [20 points]


a.  rationalize why hybrid orbitals are needed


b.  identify the type of hybrid orbitals needed; justify / rationalize your response.


c.  describe the process of forming the hybrid orbital needed starting from the orbital diagram of the central atom.