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Molecular Modeling and Lewis Structures

There is no charge indicated in the above formulas which indicates that they are molecular compounds and not ionic compounds.

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Experiment Naming Ionic and Molecular Compounds

Converting a Name to a Molecular Compound Formula

Example 3: Writing a Nonmetal + Nonmetal Formula: Carbon Tetrafluoride

1. Read the name of the compound. carbon tetrafluoride

2. Write the first chemical symbol based on the first name written in the compound. carbon = C

3. Include the number of atoms based on the prefix (if any) included in the first name. 1 carbon atom = C

Note: Since the word “carbon” in carbon tetrafluoride has no prefix, it can be assumed that there is only one carbon atom in the molecule.

4. Write the second chemical symbol based on the second name written in the compound. fluoride = fluorine = F

5. Include the number of atoms based on the prefix (if any) included in the second name. tetrafluoride = 4 fluorine atoms = F4

6. Write the formula of the molecular compound. carbon tetrafluoride = CF4

Note: You will not be asked to “balance” the formula of molecular compounds because there are no ions to balance. Ionic charges and balancing equations will be introduced later.

Example 4: Writing a Nonmetal + Nonmetal Formula: Diboron Trioxide

1. Read the name of the compound. diboron trioxide

2. Write the first chemical symbol based on the first name written in the compound. boron = B

3. Include the number of atoms based on the prefix (if any) included in the first name. diboron = 2 boron atoms = B2

4. Write the second chemical symbol based on the second name written in the compound. oxide = oxygen = O

5. Include the number of atoms based on the prefix (if any) included in the second name.

trioxide = 3 oxygen atoms = O3

6. Write the formula of the molecular compound. diboron trioxide = B2O3

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