CH 201 Lecture 04news - CH 201 Thursday October 6 Chemical...

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CH 201 Thursday, October 6 “Chemical Formulas”
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Announcements First exam is next Thursday Assigned problems are meant to be attempted after lecture , not before
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Last Time… Atomic Sociology Groups of elements Metals and nonmetals Compound formation Ionic Compounds Between metals and non-metals Ions Ionic bonding Predicting charges of ions
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Formulas For Ionic Compounds Ionic compounds must have an overall charge of zero Example: Magnesium and fluorine Example 2: Lithium and sulfur
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Polyatomic Ions Certain groups of atoms bond together with an overall net charge Example: NH 4 + This is called a polyatomic ion Polyatomic ions, once formed, act just like single ions Ie. they are attracted to ions of opposite charge NH 4 + Cl
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Polyatomic Ions in Compounds Parentheses are used to denote more than one polyatomic ion in a compound Ie. Ca(OH) 2 Example: Sodium and sulfate Example 2: Ammonium and phosphate
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