Name:  ______________________________                                                period:  _______

 

Ch. 8 & 18 chemical reactions              test     [60 points]                               honors 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.                  Clearly identify the problems done and do them in sequence and your answer must begin and end on the same page of paper; otherwise, you will lose points.

 

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 species that is oxidized and reduced; write the oxidation number next to these species. [18 points]

a. Cu + HNO3 à  Cu(NO3)2 + NO2 + H2O

b. C2H6 + O2 à  CO2 + H2O

c.  hydrogen peroxide  à  water and oxygen gas

2.  What is the oxidation number in each atom in __ ?  [10 points]

 

a.  nitrate                               b.  C2H6                                  c. nitrogen gas

3.  Write the net ionic equation for __; need not balance the chemical equation or show your work, but need the correct chemical formula.   [12 points]

a.  the combustion of methane (CH4 )

b.  mixing aqueous solutions of silver nitrate and potassium chloride

c.  combine aqueous solutions of sodium phosphate and iron (II) chloride

d.   add solutions of acetic acid (i.e. hydrogen acetate) and sodium bicarbonate

4.  Based on solubility rules, design an experiment to differentiate between an aqueous solution of __; include an interpretation of your results.  [10 points]

a.  Cu(NO3 )2   versus  CuCl2                                                                      b.  NaOH  versus  NaI

5.  Indentify the type(s) of reactions; use the following choices:   [10 points]

 

acid-base                               combustion                           decomposition                     double replacement

precipitation                         redox                                      single replacement               synthesis

a.  AgNO3  +  Sn  à  Sn(NO3)2  +  Ag                      Rx type(s)  =

b.  HNO3  +  NaOH  à  H2O  +  NaNO3                  Rx type(s)  =

c.  CH3OH  +  O2  à  CO2  +  H2O                            Rx type(s) =   

d.  O2  +  H2  à  H2O                                                 Rx type(s) =

e.  CH3NH2  à  C  +  H2  +  N2                                 Rx type(s) =