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Nomenclature Naming Compounds
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Binary Compounds
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Compounds with only two elements in any ratio
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KClNO 2 CaCl 2 P 2 O 5 Al 2 O 3 H 2 S Na 2 Oetc
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Binary compounds can be either ionic or covalent
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Naming Binary Compounds
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Naming Ionic Compounds
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Name positive element first with its normal name Name negative element last & change its ending to -ide
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KCl CaCl 2 Al 2 O 3 Na 2 O
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Name Each: CaCl 2 CaS K 2 OLiF
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Name Each: FeCl 2 FeCl 3
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If the Positive element is not from columns I or II its ox # must be determined and written in roman numerals
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Determining the Charge 1)Add up the oxidation numbers of all the negative elements 2)The positive portion must balance out the negative portion 3)Divide the positive portion by the metal subscript
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CuClFe 2 O 3 MnO 2 CrO 3 Name Each:
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Molecule
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A covalent compound that can exist as a separate unit Non-metals bond to form molecules
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Naming Molecules or Covalent Compounds
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Same rules as ionic compounds except: use geometric prefixes to determine the # of each atom
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Geometric Prefixes 1-mono5-penta 2-di6-hexa 3-tri7-hepta 4-tetraetc
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COS 2 O 3 N 2 H 4 SO 3 Name Each:
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Nomenclature HW Work problems: 49 - 54 on page 51
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CaOP 2 O 5 Al 2 S 3 SO 2 Drill: Name Each:
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Deriving Formulas 1)Write the symbol for each element 2)Determine ox #s for each 3)Determine lowest common multiple to balance the charge 4)Apply subscripts
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Write formulas for: Sodium sulfide Lead (II) iodide Diphosphorus pentoxide
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Write formulas for: Chromium(III) oxide Aluminum carbide
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Polyatomic Ion
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A group of atoms chemically combined that together have a charge
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Most are oxoanions PO 4 -3 SO 4 -2 A root element bound to oxygen
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Naming Polyatomic Ions
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Learn the polyatomic table on page 42 & 43 Learn how to use the periodic table to determine polyatomic ions
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Name the root element Change the ending to -ate PO 4 -3 = phosphate Some are unusual
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CN -1 OH -1 C 2 H 3 O 2 -1 C 2 O 4 -2
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H 2 O H 3 O +1 NH 3 NH 4 +1
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Polyatomic Ion Endings Maximum O = -ate 1 less than max O = -ite SO 4 -2 = sulfate SO 3 -2 = sulfite
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Naming Ternary Compounds
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Ternary Compounds Compounds containing more than two different elements Most contain polyatomic ions
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Follow ionic rules for naming the compound Name the polyatomic ion as the positive or negative portion
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CaCO 3 K 2 SO 4 Name Each:
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Pb(NO 3 ) 2 MgSO 3 Name Each:
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Write Formulas For: Lead (II) nitrate Aluminum sulfate Potassium chlorate Ammonium phosphite
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Name the Following: BaSO 4 CuNO 3 SO 2 (NH 4 ) 3 PO 4
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Naming Acids
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Binary acids become: Hydro _____ ic acids HCl - Hydrochloric acid
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Ternary acids become: _____ ic acids or _____ ous acids H 2 SO 4 - Sulfuric acid H 2 SO 3 - Sulfurous acid
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____ ic acids form from polyatomic ions ending with ___ ate ____ ous acids form from polyatomic ions ending with ___ ite
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___ ide ions become: hydro ___ ic acids ___ ate ions become: ___ ic acids ___ ite ions become: ___ ous acids
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Percent Composition by Mass
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Determine the atomic mass of each element in the compound Determine the molecular mass of the compound by adding Divide each elemental mass by molecular mass Multiply by 100 %
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MgCl 2 Mg = 24.3 g/mole 2 Cl = 2 x 35.5 = 71.0 g/mole MgCl 2 = total = 95.3 g/mole % Mg =24.3/95.3 x 100% % Cl = 71.0/95.3 x 100 %
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Determine % Comp for Each: Fe 2 O 3 C 3 H 6 O 3 CuSO 4 *5H 2 O
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Empirical Formula
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Lowest whole number ratio of elements in a compound C 6 H 12 O 6 : EF = CH 2 O
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Determining Empirical formulas from percent composition
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Assume 100 g Change % directly to grams Use molar conversions to convert grams to moles Divide each molar amount by the smallest molar amount
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Substance = 30 % O & 70 & Fe 30 % O --> 30 g O & 70 % Fe --> 70 g Fe 30/16 = 1.875 moles O 70 / 56 = 1.25 moles Fe 1.25/1.25 = 1 & 1.875/1.25 = 1.5 Ratio = 1.5 : 1 x 2 = 3 : 2 Empirical Formula Fe 2 O 3
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Find empirical for a compound with: 70.0 % Fe 30.0 % O
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Find empirical for a compound with: 40 % Ca 12 % C 48 % O
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Find empirical for a compound with: 40.0 % C 6.7 % H 53.3 % O
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Molecular Formula
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The actual whole number for each element in the compound
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Molecular Formula C 6 H 12 O 6 Empirical Formula CH 2 O
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Solving MF from EF 1) Solve empirical mass 2) Divide EM into MM 3) Multiply EF by quotient
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Name each of the following: KBrMgS BaF 2 K 3 P K 2 OLiH Al 2 O 3 H 2 S
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Name each of the following: FeO Fe 2 O 3
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Name each of the following: CuOMnS PbO 2 Cu 2 O CrCl 2 MnF 2 CrCl 3 SnCl 4
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Name each of the following: SeOCS 2 NO 2 Cl 2 O N 2 O 4 PCl 3
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Derive formulas for each: Cesium oxide Barium chloride Calcium phosphide Aluminum sulfide
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Derive formulas for each: Lead(IV)oxide Copper(II)sulfide Manganese(VII)oxide Nickel(II)fluoride
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Name each of the following: SO 4 -2 SO 3 -2 PO 4 -3 NO 3 -1 ClO 4 -1 ClO 3 -1 ClO 2 -1 ClO -1
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Derive formulas for each: Chromate Arsenate Arsenite Bromite
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Name each of the following: BaCO 3 KNO 2 CuClO 3 Al 2 (SO 4 ) 3
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Derive formulas for each: Potassium sulfate Lead(II)chromate Aluminum hydroxide Ammonium cyanide
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Name each of the following: Cl 2 OSO 2 N 2 O 3 P 2 O 5 CO 2 CO SO 3 N 2 H 4
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Derive formulas for each: Silicon dioxide phosphorus trichloride Sulfur hexafluoride Iodine trifluoride
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Name each of the following: NH 4 ClBaSO 4 KC 2 H 3 O 2 K 2 HPO 3 KNO 3 CuBrO Li 2 CO 3 MgC 2 O 4
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Name each of the following: HClH 2 SO 4 H 2 S H 3 PO 3 HNO 3 HBrO H 2 CO 3 HBrO 4
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Derive formulas for each: Chromic acid Hydroiodic acid Sulfurous acid Bromic acid
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Name each of the following: KClMnSO 4 SO 2 HI (aq) NaNO 3 HClO H 2 CO 3(aq) NH 4 BrO 4
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Name each of the following: NaCl MnSO 4 S 2 O 3 HBr (aq) Na 2 CO 3 HClO HNO 3(aq) NH 4 IO 4
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Chapter 3 General Define all the Key Terms on page 74
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Nomenclature Work problems 43 – 56 On Pages 51 & 52
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