CHM 1025C        Module Four Sample Exam Answers                                 

 

Module Four: Part A: Bond Recognition                                      5 points

Using a periodic chart, classify each element in the pair as a metal or nonmetal, then predict the bond type that should exist between the two elements. (Assume all metal-nonmetal combinations have an electronegativity difference greater than 1.7)

 

1.         Na-Cl           ___Ionic_____             4.    Cu-Fe    ___metallic______

 

2.         Mg-O           ___Ionic_____              5.    Si-S      ____covalent______

 

3.         S-O              ___covalent______

 

See your Corwin textbook Section 12.1. Work Problems 6-10 p 336 for similar exercises

 

Module Four: Part C    Binary Molecular Compounds      10 points

Using a periodic chart write the names or formulas of the following compounds depending on whether the formula or name is given:

 

1.    CO       __carbon monoxide____

 

2.    SO3     ___sulfur trioxide_____

 

3.    N2O5   ___dinitrogen pentoxide______

 

4.    N2O7   ___ dinitrogen heptoxide

 

5.    N2O     ___ dinitrogen oxide _or ___ dinitrogen monoxide

 

6.    Phosphorus pentachloride     ___ PCl5___

 

7.    Boron trifluoride                     ___ BF3____

 

8.    Carbon dioxide                      ___ CO2____

 

9.    Sulfur Trioxide                       ___ SO3____

 

10.  Carbon Tetrachloride            ___ CCl4____

 

In your Corwin textbook see Section 7.7. Similar problems on p189 #43-46

Online Homework:

C: Binary Molecular (Covalent) Homework: http://www.fccj.us/Nomenclature/Molecules/binaryCovalent.html 

C1. Binary Molecular (Covalent) Formulas: http://www.fccj.us/Nomenclature/MoleculeFormula/BinaryMolecularFormula.html)