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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 )
Starts with Metal 1) Write the name of the 1st element 2) Write the name of the 2nd element, change the ending to -ide 2) Write the name of the polyatomic.
Chemical Nomenclature Naming and writing Chemical Formulas.
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YESNO Is compound binary? YESNO Is the 1st element a METAL ?
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Naming Compounds Flowchart 2 elements Covalent Binary (type 3) Acid YES (type 1, 2) H + Element Hydro + root anion + -ic acid H + Polyatomic ion Poly ion.
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Naming Chemical Compounds Ionic and Molecular. Ionic and Covalent Compounds Binary Compounds 2 elements Ionic Compounds a metal and a non-metal a metal.
Naming Bonds. Ionic Naming Rewrite the name of the first symbol (metal). Write the beginning of the second symbol (non-metal). Add –ide as a suffix to.
Naming Chemical Compounds 1. Ions: Naming and Formulas Cations (positive charge) Single ion formation – Metals in groups 1,2,13 – Element Name + ion –
Binary Molecular Compounds Two elements, usually nonmetals Familiar compounds use common names: NH 3 CH 4 H 2 O **most are named in a systematic way.
How Do We Make Compounds?. What is inside the atom? Atom: made of subatomic particles Proton (+) = atomic # : determines the identity of the element Neutron.
1 Nomenclature Chapter 5. 2 Common Names - Exceptions H 2 O = water, steam, ice NH 3 = ammonia CH 4 = methane NaCl = table salt C 12 H 22 O 11 = table.
Nomenclature Chapter 4. Nomenclature = Naming Common names were created before there was a system in place Common names were created before there was.
Type III Binary Compounds Key Points 2 non-metals bonding non metals have positive oxidation states.
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Monatomic Ions Ions formed from a single atom Written as (E 2+ ) or (E 2- ) Change ending to -ide.
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ANIONS: Atoms that have gained electrons and have a negative charge -Nonmetals form anions CA+IONS: Atoms that have lost electrons and have a positive.
Molecules Molecule – two or more atoms covalently bound together Diatomic molecule – two of the same atom bound together.
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Chemical Bonding Chapter 7. The Octet Rule Atoms tend to gain, lose, or share electrons in order to get a full set of valence electrons. “octet” – most.
Nomenclature Chart of Flowage (Naming Flowchart) cations + anions - cations + anions -
Covalent Bonding. We begin with the molecule Molecule– two or more atoms covalently bound together Diatomic molecule—two of the same atom bound together.
Covalent Compounds. Covalent Bonds Atoms of two nonmetals combined Held together by sharing electrons “co” means cooperate/share “valent” refers.
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