Ch. 15, 16, & 19.7  equilibrium                       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.  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 will lose points.  attach this sheet to the front of your exam.

 

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.  In the reaction, glucose-6-phosphate  à  fructose-6-phosphate,  ΔG° = 1.7 kJ at 25 °C.  [10 points]

 

a.  Would the reaction occur under standard conditions ?  justify your response. 

 

b.  If the reaction does not occur, then describe a possible condition (i.e. provide numerical values of the relevant parameter(s)), where the reaction would occur.  Justify your response.

 

 

2.  A 0.010 M monoprotic acid has a % ionization = 23 %.  What is the value of the Ka of the acid ?  [10 points]

 

 

3.  What is the pH of a 275 mL aqueous solution of __. [20 points]

 

a.  1.0 mM benzoic acid

 

b.  1.0 mM hydrazine

 

 

4.  What is the pH of a 275 mL aqueous solution of 1.0 mM ethylamine hydrochloride ?   [15 points]

 

 

5.  At 37 °C, if in the synthesis of ammonia, N2  +  H2  à  NH3, the initial [N2], [H2], and [NH3] was 1.0 mM, 2.0 mM, and 3.0 mM, respectively and the equilibrium [NH3] = 2.5 mM, then what is the value of Kp ?  [15 points]

 

 

6.  old topics:  describe and rationalize the periodic trends in the first ionization energy in the 4th row in the periodic table, including any exceptions.  [20 points]