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)