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)