MOLECULAR COMPOUND AND FORMULAS NOMENCLATURE

“Love”, Robert Indiana, American, 1967

Before we begin, I just wanted to take time to let you know about a substance that is quietly destroying the environment and disrupting world economies, yet nothing is being done about it: dihydrogen monoxide (DHMO.)

FACTS:

• In a study between 2005 and 2009, 3533 people died from Dihydrogen Monoxide (DHMO) inhalation during recreational use in the U.S.
• DHMO is the 3rd leading cause of unintentional injury-related deaths worldwide, accounting for 7% of all injury- related deaths. (388,000 annually)
• Please click on this link to learn more about this dangerous substance: http://www.dhmo.org/facts.html

BINARY MOLECULAR (2 NONMETALS)

1. Name the least electronegative element first.

BINARY MOLECULAR (2 NONMETALS)

1. Name the least electronegative element first.
2. Change the last syllable of the second element to “-ide”.
3. Add appropriate prefix to element name to indicate the number of atoms of each element present.

BINARY MOLECULAR PREFIXES

1-mon(o)

2-di

3-tri

4-tetr(a)

5-pent(a)

6-hex(a)

7-hept(a)

8-oct(a)

9-non(a)

10-dec(a)

Notice that the vowels at the end of each prefix (except for di- and tri-) are in parentheses. This is because sometimes you use the vowel and sometimes not. The general rule is: use the vowel if used with an element that starts with a consonant (e.g., tetrafluoride); don’t use the vowel if used with an element that starts with a vowel (e.g., tetroxide).

BINARY MOLECULAR PREFIXES

DO NOT EVER USE “MONO-” ON FIRST ELEMENT BUT DO USE ON SECOND ELEMENT!!!

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PRACTICE 1

Name the following compound:

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N₂O

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dinitrogen monoxide

PRACTICE 2

Name the following compound:

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CS₂

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carbon disulfide

PRACTICE 3

Name the following compound:

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SF₆

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sulfur hexafluoride

PRACTICE 4

Name the following compound:

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P₂O₄

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diphosphorus tetroxide

PRACTICE 5

Write the formulas for the following compound:

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nitrogen monoxide

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NO

PRACTICE 6

Write the formulas for the following compound:

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phosphorous pentachloride

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PCl₅

PRACTICE 7

Write the formulas for the following compound:

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xenon tetrafluoride

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XeF₄

PRACTICE 8

Write the formulas for the following compound:

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dihydrogen monoxide

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H₂O

THAT’S IT!

Dihydrogen monoxide = H₂O...Beware!

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Now do some practice on your own. The assignment is posted on today’s agenda. Good luck!