Ch. 6 & 7 electronic structure & periodic trends test                     [70 points]             AP Chem

For problems involving calculations, show the relevant equation (or formula and conversion factor(s)), show your work in an organized manner, put the proper units in your calculations / answer, and 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.  The minimum frequency of light to produce the photoelectric effect in a hypothetical metal is 125 MHz.  An incident light has a wavelength of 325 cm.  [20 points]

a.  would the photoelectric effect happen ?  Justify your response.

b.  If the photoelectric effect happens, then what is the kinetic energy of the emitted electrons ?   If the photoelectric effect does not happen, then what is the range of wavelengths of light to produce the photoelectric effect ?


2.  In the hydrogen atom, what is the difference in the energy of an electron in the n = 1 versus n = 3 energy level ?  [10 points]

 

3.  sketch the orbital diagram of selenium; identify all valence electrons.  [5 points]

 

4.  What is the product(s) in the following reactions ?  Need not balance the chemical equation. [10 points]

a.  Na  +  H2 O  ->  __________________

b.  Al  +  Cl2   ->  ___________________

c.  Na2 O  +  H2 O  ->   ________________

d. MgO  +  HCl  ->   _________________

e.  Li  +  O2   ->  ____________________


5.  ionization energy (IE).  [15 points]

a.  Which atom, oxygen or fluorine,  has the larger 1st IE ?  Rationalize your answer.

b.  Which atom, nitrogen or phosphorus, has the larger 1st IE ?  Rationalize your answer

c.   In calcium,  1st IE < 2nd IE << 3rd IE.  Rationalize this trend.

 

6.  old topic:  organic chemistry  [10 points]

a.  sketch the structural formula of cis-2-butene

b.  sketch the structural formula of 2 isomers of the preceding chemical.