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• Help Center Graphing Assignment

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Where are we?
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Formulas for Acetic Acid

• Molecular
• C2H4O2
• Empirical
• CH2O
• Condensed Structural
• CH3COOH

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Naming Molecular Compounds

• Binary compounds- 2 different elements
• Name first element, using full name
• Name second element, adding ide
• Use prefixes to indicate of atoms
• Only use prefix for first name if gt1 atom
• Always use prefix for second element
• Examples
• CO
• N2O
• BF3

Prefix
1 mono-
2 di-
3 tri-
4 tetra-
5 penta-
6 hexa-
7 hepta-
8 octa-
9 nona-
10 deca-
Exception Some materials have common names (e.g.
H2Owater, NH3ammonia)
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Where to next?
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Ions

• Cations
• Positive charge
• (think Caion)
• Obtain charge by __?__-ing an electron
• Usually form from metals

• Anions
• Negative charge
• Obtain charge by __?__-ing an electron
• Usually form from nonmetals

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Monatomic Ions- Formed from single atoms
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Naming Ions

• Cations
• Name of element ion
• Na sodium ion
• Mg2 magnesium ion
• Transition metals are special
• Fe2 iron (II) ion
• Fe3 iron (III) ion

• Anions
• Name of element with an ide ending ion
• Cl- chloride ion
• O2- oxide ion

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Polyatomic Ions you need to know
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How Ionic Bonds Form
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Ionic Compound Formulas

• Compound will be neutral
• Total positive charge Total negative charge
• Example

Cation Anion Compound
Na Cl- NaCl
Ca2 Cl- CaCl2
Mg2 SO42- ?
Na CO32- ?
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What is the formula of the ionic compound
produced by Mg2 and SO42-?

1. MgSO4
2. Mg2SO4
3. Mg(SO4)2
4. MgSO2

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What is the formula of the ionic compound
produced by Na and CO32-?

1. NaCO3
2. Na(CO3)2
3. Na2CO3
4. Na2(CO3)2

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Ionic Compound Formulas

• Compound will be neutral
• Total positive charge Total negative charge
• Example

Cation Anion Compound
Na Cl- NaCl
Ca2 Cl- CaCl2
Mg2 SO42- MgSO4
Na CO32- Na2CO3
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Naming Ionic Compounds

• Compound name cation name anion name
• Examples
• NaCl
• Sodium chloride
• NH4Br
• Ammonium bromide
• HCN
• Hydrogen cyanide