Ch. 7 & 14  IMF & chemical equation            test     [60 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.  Identify the IMF in  ___ ; justify your response.  [10 points]

 

a.  SeCl4

 

b.  BF3

 

 

2.  Describe London IMF in a nonpolar molecule; hint:  include the terms, “dipole moment”, “temporary dipole”, & “induced dipole” in your response.  [15 points]

 

 

3.  Which molecule, ___,  has the higher vapor pressure ?  justify your response.  [20 points]

 

a.  Br2  versus  I2

 

b.  ethanol   versus   dimethyl ether

 

 

4.  balance the following chemical equation using the lowest ratio of integers.  If the coefficient(s) is / are “1”, then enter “1”.  [15 points]

 

a.  ___ CH3CH2OH  +  ___  O2  à  __  CO2  +  ___  H2O

 

b.  ___  calcium nitrate  +  ___  sodium phosphate  à  ___  calcium phosphate  +  ____  sodium nitrate

 

c.  ___ Na2CO3  +  ___  HCl  à  ___ CO2  +  ___   H2O  +   ___ NaCl