Ch. 6 & 7 AO & periodic trends         test     [90 points]       AP 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.              

 

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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1. Light with a wavelength of 345 nm causes the emission of electrons with a kinetic energy of 1.23 * 10-19 J; what is the minimum frequency of light needed for the emission of electrons ?  [weekly quiz problem;  15 points]

 

2.  An electron in hydrogen goes from the n = 4 to n = 1 electron energy level.  [15 points]

a. Is it an emission or absorption process ?

b. What is the wavelength (in nm) of the light that was emitted (or absorbed) ?

3.  Using the short-hand notation, draw the orbital diagram for __; clearly identify all valence electrons.  [10 points]

a.  Bromine

b.  Lead

4.  Describe and rationalize the periodic trends in the first ionization energy in the fourth row in the periodic table going from left to right; include any exceptions to the trend (also, include its rationale).  [20 points]

 

5. Write the balanced chemical equation describing the reaction of __.  [15 points]

a.  Carbon dioxide bubbled into an aqueous solution of potassium hydroxide

b.  Magnesium oxide added to water

c.  Sodium metal surrounded by hydrogen gas (hmm; did you read the textbook)

6.  Old topic:  sketch 5 isomers of hexane.  [15 points]