Name:  ______________________________                                                period:  _______

 

Ch. 7 & 14  IMF & chemical equations            test     [69 points]                   honors Chem

 

To conserve school resources (i.e. use of photocopier & paper), you will supply your own paper.  Start each problem on a new side of the paper; otherwise, you might lose points.  Attach this sheet to your answers.

 

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. Using the lowest ratio of integers, balance the following chemical equations; use “1” as appropriate.  [29 points; # points shown in brackets]

 

a.  fluorine gas reacts with aluminum oxide to form aluminum fluoride and oxygen gas. [8]

 

b.  burning ethane (C2H6) in air (i.e. oxygen gas) produces carbon dioxide and water [7]

 

c.   ___  NH3  +  ___ O2  à  ___  NO +  ___  H2O [4]

 

d.   ___  CH3OH  +  ___ O2  à  ___ CO2  +  ___ H2O [4]

 

e.  ___  K3PO4  +  ___  CaCl2  à  ___  calcium phosphate  +  ___  potassium chloride [6]

 

 

2.  What is the relative boiling points of C2H5, CH4, and C5H12 ?  Justify your response.  [15 points]

3.  What is the relative vapor pressure of   CH3OCH3  versus CH3CH2OH ?  Rationalize your response.  [10 points]

 

                   H           H                                   H    H

                    |     ..      |                                     |      |     ..  

H – C – O – C – H                   H – C – C – O – H

                     |      ¨      |                                     |       |     ¨

                    H           H                                   H     H 

 

 

4.  Identify the IMF in  __; include the basis of your answer.  [15 points]

 

a.  C2H5

 

b.  CH3OH  (see # 3 for its Lewis structure)

 

c. CH3CH2OH  (see # 3 for its Lewis structure)