Ch. 7 & 14  IMF & chemical equation            test     [60 points]                   Chem

 

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 / define the terms, “dipole moment”, “temporary dipole”, & “induced dipole” in your response.  [15 points]

 

 

3.  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


 

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

 

a.  Br2  versus  I2

 

 

b.  structural formulas (hint:  not Lewis structures) shown below:

 

                   H    H                                                   H           H

                    |      |                                                     |             |                      

H – C – C – O - H   (ethanol)  versus  H – C – O – C - H   (dimethyl ether)

                       |      |                                                     |             |                      

                    H    H                                                   H           H