Скачать или смотреть How to Write the Formula for Silicon dioxide

In this video we'll write the correct formula for Silicon dioxide (SiO2). To write the formula for Silicon dioxide we’ll use the Periodic Table and follow some simple rules.

Note that Silicon dioxide forms a covalent solid with many SiO2 formula units connected together. I

When we have a non-metal and a non-metal we have a molecular compound (sometimes called covalent). Molecular compounds are some of the simplest to name.

Keys for Writing the Formulas for Molecular Compounds:

Write the element symbol for both elements.
Place a subscript after each element according to its prefix.

Note: Don’t write the subscript '1'.

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Prefixes
mono- 1
di- 2
tri- 3
tetra- 4
penta- 5
hexa- 6
hepta- 7
octa- 8
nona- 9
deca- 10
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Caution: We only write "mono" for the second element in a molecular compound. So CO would be carbon monoxide. Monocarbon monooxide is incorrect.

--Formula Writing Resources--

• Writing Formulas for Molecular compounds:    • Naming and Formula Writing for Molecular C...  
• Introduction to Formula Writing:    • Introduction to Naming and Formula Writing  
For a complete tutorial on naming and formula writing for compounds, like Silicon dioxide and more, visit:

http://www.breslyn.org/chemistry/naming

Drawing/writing done in InkScape (http://www.InkScape.org). Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).