Скачать или смотреть How to Write the Formula for Hydrogen sulfide

In this video we'll write the correct formula for Hydrogen sulfide (H2S).

To write the formula for Hydrogen sulfide we’ll use the Periodic Table and follow some simple rules.

Note that you could also call H2S:

Dihydrogen sulfide
or
Dihydrogen monosulfide

but the IUPAC name is Hydrogen sulfide.

Note when H2S is in water is is called Hydrosulfuric acid (see    • How to Write the Formula for Hydrosulfuric...  ).

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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.

For a complete tutorial on naming and formula writing for compounds, like Hydrogen sulfide and more, visit:

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

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