Ch. 3 & 11 chemical equation & IMF             test                 [95 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.


                                                                                                Signature:  ___________________

1. Balance the following chemical equations using the lowest ratio of integers; enter “1” as appropriate.  [18 points]

a.  ___  C2H6  +  ___  O2  à  ___  CO2  +  ___ H2O


b.  ___  K2CO3  +  ___  Mg(NO3)2  à  ___  KNO3  +  ___  MgCO3 


c.  ___  Fe  +  ___  O2  à  ___  Fe2O3


d.  ___ KClO3  à  ___ KCl  +  ___  O2


e. ___ Aluminum bromide  + ___ potassium sulfate à  ___ potassium bromide + ___ aluminum sulfate

2. In regards to the reaction:  15.0 g C2H6  +  25.0 g O2  à  CO2  +  H2O, at the end of the reaction, how many grams of __ remain ?  [15 points]

a.  excess reactant

b.  CO2

3. A compound contains 62.5% scandium and 34.8% oxygen; what is its empirical formula ?  [15 points]


4. Sketch the vapor pressure versus temperature graph, draw 2 curves, then identify which curve would be an ether with methyl groups versus an alcohol with an ethyl group.  Justify your answer.  [20 points]


5.  Describe how to determine the ΔHvaporization based on data of the relationship between the vapor pressure  as a function of temperature using __, include the basis of the analysis.  [10 points]

a.  an algebraic method


b.  a graphical method

 Describe the basis of London IMF in a nonpolar compound.  [10 points]


7.  Old topic:  draw the orbital diagram for phosphorus.  [7 points]