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Homework: Names and Formulas
of Molecular Compounds

Follow the instructions given for each section of this worksheet. You will need your periodic table, a quiet place to work, and your wits to complete this homework. Also, you may find it helpful to refer back to the text of the activity you did prior to this homework.

Text Review

Answer the following questions using complete sentences.
  1. What is the difference between a compound and an element?
  2. What are the characteristics of metallic elements? Where are they found in the periodic table?
  3. Describe the properties of non-metals. Where are they found in the periodic table?
  4. What kinds of elements are involved in most molecular compounds?
  5. What is a diatomic molecule?
  6. Is it necessary for a diatomic molecule to be made of two of the same atom? Explain.
  7. Which elements exist in pure form as diatomic molecules? (Remember, you must memorize these!)
  1. What are some compounds that are diatomic molecules?
  2. Describe the behavior of electrons in a covalent bond between atoms. How do the electrons keep the atoms bound together?
  3. What are the physical characteristics or properties which differentiate ionic compounds from molecular compounds?
  4. Compare and contrast the types of elements found in the chemical formulas of molecular compounds and ionic compounds.
  1. In your own words, write down the correct procedure for writing a name for a molecular compound from its formula. Enrich your procedure with examples such as how to name these compounds: NO, BrI, BrI5, P4O10.


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Lewis Diagrams

For each of the following atoms write down the number of valence e-s. Also, draw the Lewis dot diagram. For example, Magnesium (Mg) has two valence electrons and has a Lewis diagram that looks like this: Mg:

  1. K
  2. As
  3. Al
  4. N
  1. C
  2. S
  3. Br
  4. Ar
  1. In your own words explain how to find the correct number of valence electrons from an element’s position in the periodic table.

Writing Names

  1. BrO3
  2. N2O5
  3. NI3
  4. P2O5
  5. S2Cl2
  6. ICl2
  7. SO2
  8. SnCl4
  9. N2O4

  1. PCl5
  2. SF4
  3. SF6
  4. PCl3
  5. H2O
  6. Si3N4
  7. O2F2
  8. ClF3
  9. AsI3

Writing Formulas

  1. Sulfur trioxide
  2. Dinitrogen trioxide
  3. Dinitrogen monoxide
  4. Xenon hexafluoride
  5. Sulfur hexafluoride
  6. Phosphorous pentachloride
  7. Nitrogen monoxide
  1. Carbon Monoxide
  2. Phosphorus Pentachloride
  3. Dinitrogen Tetrasulfide
  4. Iodine Monobromide
  5. Xenon Tetrafluoride
  6. Sulfur tetraiodide
  7. Carbon disulfide
This homework belongs with the Chemical Nomenclature of Molecular Compounds group activity.
Additional Practice and Review
ChemTeam Additional Naming Information and Practice
(has lots of exercises with answers) Last updated: Jan 13, 2017       Home