Ch. 7, 8, & 18  chemical equations & reactions           test     [65 points]       honors 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 (as appropriate, enter “1”).  [15 points]

a.   ____  CH3 OH  +  ____ O2   -->  ___ CO2   +  ____ H2 O

b.  ___  NH3   +  ___ O2   -->  ___ NO  +  ___ H2 O

c.  ___  Cr  +  ___ O2   -->  ___ Cr2 O3

d.  ___  magnesium nitrate  +  ___ potassium phosphate  -->   ___  magnesium phosphate  +  ___  potassium nitrate

 

2.  Write the net ionic equation; need not balance the coefficients in the equation, but need to have the correct chemical formula.  [18 points]

a.  HCl  +  NaOH  -->

b.  Cu  +  HBr  -->

c.  CH4   +  O2   --> 

d.  Na2 CO3   +  HNO3   -->

e.  Na2 S  +  AgNO3   -->

f.  Cl2   +  HI  -->

 

3.  Identify the chemicals that are oxidized or reduced; write the oxidation number near the chemicals that are oxidized or reduced.  [20 points]

a.  O2   +  H2   -->  H2 O

b.  NH3   -->  N2   +  H2

c.  Cu  +  HNO3   -->  Cu(NO3 )2   + H2 O  +  NO2

d.  KMnO4   +  Zn  -->  Zn+ 2  +  H2 O  +  MnO2

 

4.  Based on solubility rules, design an experiment to differentiate between an aqueous solution of __; include an interpretation of your results.  [12 points]

a.  Cu(NO3 )2   versus  CuCl2

b.  NaOH  versus  NaI

 

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Ch. 7, 8, & 18  chemical equations & reactions           retest  [65 points]       honors Chem

 

1.  Balance the following chemical equations using the lowest ratio of integers (as appropriate, enter “1”).  [16 points; 1 point extra credit]

a.  ___ CH3 CH3   +  ___ O2   -->  ___ CO2   +  ___ H2 O

b.  ___  Al  +  ___ H2 SO4   -->  ___  Al2 (SO4 )3   +  ___  H2

c.  ___ Be2 C  +  ___  H2 O  -->  ___ Be(OH)2   +  ___ CH4

d.  ___  calcium nitrate  +  ___ sodium phosphate  -->   ___  calcium phosphate  +  ___  sodium nitrate

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

a.  NaNO3   versus  KCl

b.  LiOH  versus  KI

3.  Identify the chemicals that are oxidized or reduced; write the oxidation number near the chemicals that are oxidized or reduced.  [20 points]

a.  H+   +  K2 Cr2 O7   +  Cu  -->  Cu2+   +  Cr+3   +  H2 O  + K+

b.  CH4   +  O2   -->  CO2  +  H2 O

c.  H 2  +  Cl2   -->  HCl

d.  H2 O2   (hydrogen peroxide)  -->  O2   +  H2 O

5.  Write the net ionic equation; need not balance the chemical equation, but need correct chemical formula.  Identify reaction type(s):  double replacement Rx, single replacement Rx, redox Rx, combustion, synthesis, decomposition, or precipitation Rx.  [20 points]


a.  C3H8 (g)   +  O2 (g)   --> 

b.  HCl (aq)   +  F2 (g) --> 

c.  K2 CO3 (aq)   +  HNO3 (aq)   -->

d.  Na2 SO4 (aq)   +  Pb(NO3 )2 (aq)   -->

e.  Na(s)  +  Cl2 (g)   -->