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Unformatted text preview: les/principles_of_nomenclature.pdf 1 9/10/2013 Chemical Formula (continued II) If a chemical formula indicates the actual atomic composition of
a molecule (with bonded atoms), it is called a molecular formula. H O C Polyatomic ions are set off as a group when writing chemical formula.
For example, in the formula unit, Mg(NO3)2, the nitrate ion is treated as
a group of atoms that together function as an anion, NO3-. O H Table salt is a collection of Na+ cations
and Cl- anions into a crystalline solid.
The smallest neutral collection is NaCl. O Mg2+ O _ O
O O Similarly, ammonium nitrate is written NH4NO3 and means:
(Memorize polyatomics in Table 5.6, unless contains Cr, Mn, or Cl) Atomic vs. Molecular vs. Ionic
(more classifications) Write the Chemical formula of the following
C3H8 Propane _ O
N If a chemical formula indicates the smallest electrically neutral
collection of ions (i.e. in a salt), it is called a formula unit. O C Some ionic formula units have collec...
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This note was uploaded on 02/04/2014 for the course CHEM 004:007 taught by Professor Russellarsen during the Fall '13 term at University of Iowa.
- Fall '13