Ch. 7 & 8  chemical equations & NIE                         test                             [40 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.

 

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 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. Write the chemical (or molecular) equation for the following reactions, where aqueous solutions of ___ are mixed; need not balance the chemical equations, but you’ll need the proper chemical formulas, i.e. need to “balance the charges in the compound”.  [12 points]

a. K2CO3 and HNO3

b. HCl and  NaOH

c. Sodium sulfate and strontium chloride

 

 3. Write the net ionic equations for the following reactions in water (i.e. apply the solubility rules on all compounds); need not balance the net ionic equations; if there is no net ionic equation, then write “no reaction”.  [9 points]

 a. Ba(NO3)2  +  Na2CO3  à  NaNO3  +  BaCO3

 b. AgC2H3O2  +  K2à  Ag2S  +  KC2H3O2

 c. Nitric acid reacting with potassium hydroxide

 

 4. What is the solubility rule for the hydroxide ion ? [1 point]