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Unformatted text preview: tions of atoms that function
together as a ionic group. These groups are called polyatomic ions. The molecular formula of oxalic acid is C2H2O4
Two illustrations of oxalic acid molecules:
O Chemical Formula (continued III) The simplest whole number ratio is the empirical formula. CHO2 What is it made of
& how is it put together? Ethylene glycol
White H C2H6O2
Use the Periodic Table to help determine charge:
A salt with lithium cations and carbonate (CO32-)
Li2CO3 Molecules are
together Notice cause and effect: compounds are constant composition
by mass because they are composed of atoms in fixed ratios. Classifying Elements & Compounds
• Atomic elements are elements whose particles
are single atoms
• Molecular elements are elements (nonmetals)
whose particles are multi-atom molecules.
• Molecular compounds are compounds whose
particles are molecules made of 2 or more
different nonmetal atoms connected by bonds.
• Ionic compounds are compounds whose
particles are cations (+x) and anions (-x...
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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