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NAMING AND WRITING FORMULAS FOR COMPOUNDS Unit 4
1. NAMING IONIC COMPOUNDS
Ionic Compound: Composed of ions Cations & Anions Metals & Nonmetals Cations: + charge Metals + Polyatomic Ions Anions: - charge Nonmetals - Polyatomic Ions
1. Name the cation (always 1 st ) 2. Name the anion – add “ide” ending (always 2 nd ) If anion is polyatomic, just use name (no ending) * This is for cations with a single charge (oxidation state)
For cations with more than one oxidation state Name the cation Add roman numeral to indicate charge of the cation
2. WRITING THE FORMULAS FOR IONIC COMPOUNDS
1. Write the cation symbol 2. Write the anion symbol (or polyatomic formula) 3. Balance + and – charges so they add to zero
3. NAMING AND WRITING FORMULAS FOR MOLECULAR COMPOUNDS
Molecular Compounds Nonmetals only Use greek prefixes to tell # of atoms 1 – mono 2 – di 3 – tri 4 – tetra 5 – penta 6 – hexa 7 – hepta 8 – octa 9 – nona 10 - deca
Recognizing an acid Molecular compound beginning with “H” (or H 2 or H 3 ) May contain polyatomic ions
Binary Acids 1. Start name with “hydro” 2. Use anion name adding “ic” ending 3. End with “acid”
Oxyacids 1. Use polyatomic ion name 1. Add “ic” in place of “ate” 2. Add “ous” in place of “ite” 2. End with “acid”
Writing Acid Formulas 1. Write the symbol for hydrogen 1 st 2. Write the symbol for nonmetal or polyatomic anion 3. Balance + and – charges so they add to zero (H will have a charge of +1)
5. DIATOMIC MOLECULES
2 of the same atom bonded together Some elements naturally exist as diatomic H, N, O, F, Cl, Br, I
Ionic salt with molecules of water attached
Naming Hydrates 1. Name the ionic compound 2. Use a greek prefix for number of water molecules 3. End with “hydrate”
Writing the Formulas for Hydrates 1. Write the formula for the ionic compound 2. Indicate the number of water molecules with big number in front of H 2 O
7. COMPOUNDS WITH COMMON NAMES
1. H 2 O 2. NaHCO 3 3. H 2 O 2 4. NH 3 5. CH 4 6. HCH 3 COO (HC 2 H 3 O 2 )
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