Ch. 8 & 9 chemical bonds        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.              

 

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.  What is the relative size of the magnesium atom versus its cation ?  Justify your response.  [10 points]

 

2.  Draw all Lewis structures for SiPS-, then use formal charges to eliminate any choice(s); include the basis to eliminate any choice(s).   [15 points] 

 

3.  Draw the Lewis structure(s) for acetic acid, a carboxylic acid with a methyl group.  Show / label bond angle(s) on all of the central atoms.  [15 points]

 

4.  Sketch ___; include bond angle(s) and the name of the shape of the molecule.  [10 points]

a. BrF3

b.  TeF4

 

5.  Using valence bond theory, describe the bonds in __.  If hybrid orbital are involved, then identify / justify the hybrid orbital needed and describe the formation of the hybrid orbital.  Define / identify any pi bonds.  [25 points]

a.  Hydrogen bromide

 

b.  nitrogen gas 

c. ammonia

6.  Old topic:  write the chemical equation that describes the reaction of ___.  [15 points]

a.  Sulfur trioxide bubbled into an aqueous solution of sodium hydroxide

b.  Add sodium oxide to water

c.  Add magnesium oxide to an aqueous solution of sulfuric acid

d. Add sodium to an environment with oxygen

e. The decomposition of an aqueous solution of hydrogen peroxide (hint:  biology lab)