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Atoms, Molecules, Ions, and Inorganic Nomenclature Brown, LeMay Ch 2 AP Chemistry Monta Vista High School.

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Presentation on theme: "Atoms, Molecules, Ions, and Inorganic Nomenclature Brown, LeMay Ch 2 AP Chemistry Monta Vista High School."— Presentation transcript:


2 2 2.2: Evidence for the Atomic Theory 1.J.J. Thomson’s cathode ray tube: discovery of electrons and the e- charge-to-mass ratio  In a vacuum chamber, flow of high voltage (emitted from cathode to anode) is deflected by magnetic & electrical fields ( animation: http://highered.mcgraw- be.swf::Cathode%20Ray%20Tube) http://highered.mcgraw- be.swf::Cathode%20Ray%20Tube

3 2.Robert Millikan’s oil drop: determines charge of e- (and thus the mass)  “Atomized” drops of oil picked up small charges (integral numbers), and balanced oil drops in an electrical & gravitational field

4 3.Ernest Rutherford’s gold foil: discovery of nucleus as center of positive charge  Alpha particles from radioactive source are deflected from positive gold atom nuclei chemistry/animations/chang_2e /rutherfords_experiment.swf

5 5 2.3: Structure of the Atom Figure 1: Subatomic particles (Table 2.1; 1 amu = 1.66054 x 10 -24 g). Subatomic particle ChargeLocationMass Proton, p + +1.6 x 10 -19 Cnucleus1.0073 amu Neutron, nNonenucleus1.0087 amu Electron, e - -1.6 x 10 -19 Ce- cloud5.486 x 10 -4 amu

6 6 Atomic number: number of p + (determines the element) Mass number: sum of p + and n (determines the isotope) Isotopes: atoms of an element that differ in the number of neutrons Isobars: atoms of different elements with same atomic mass but different atomic number. Groups or families: columns on Periodic Table: alkali (1A), alkaline earth (2A), halogens (7A), noble or inert gases (8A); pnictogens (5A) and chalcogens (6A); have same number of valence e - Periods: rows on P.T.; indicates new shell of e - Cations: positively charged ions Anions: negatively charged ions Vocabulary

7 Naming Compounds Review Before naming a compound, it is important to know why type of compound it is because different types of compounds are named differently. For naming purposes, we classify compounds as ionic compounds, molecular compounds, and acids. Ionic Compounds can be identified by the presence of a metal in it. (generally solids) Ex. NaCl, K 2 SO 4, PbSO 4 Molecular compounds are made up of all non metals. (generally liquids and gases) Ex. H 2 O, N 2 O 5 Acids begin with H (generally present as aq solutions or gases) Ex. HCl, H 2 SO 4, HClO 3 7

8 To name an ionic compound Name the metal first, followed by a roman numeral specifying its charge (ONLY if variable valency), then name the anion (monoatomic ending in –ide, and polyatomic named as such). Ex. MgO (Magnesium Oxide), Na 2 S (Sodium Sulfide), Fe 2 O 3 (Iron (III) Oxide), (NH 4 ) 2 SO 4 (Ammonium Sulfate) 8

9 Cuprous, CupricCopperCuCu + Cu 2+ Cobaltous, CobaticCobaltCoCo 2+ Co 3+ Chromous, ChromicChromiumCrCr 2+ Cr 3+ Ferrous, FerricIronFeFe 2+ Fe 3+ Plumbous, PlumbicLeadPbPb 2+ Pb 4+ Mercurous, MercuricMercuryHgHg 2 2+ Hg 2+ Stannous, StannicTinSnSn 2+ Sn 4+ Common Cations with Variable Valencies

10 AmmoniumNH 4 + ChlorateClO 3 -ThiosulfateS2O32-S2O32- NitrateNO 3 -PerchlorateClO 4 -ThiocynateSCN- PhosphatePO 4 3 -ChloriteClO 2 -PeroxideO22-O22- PhosphitePO 3 3 -HypochloriteClO-SulfiteSO 3 2 - PhosphideP3-P3-PermanganateMnO 4 -NitriteNO 2 - CarbonateCO 3 2 -AcetateC 2 H 3 O 2 - CH 3 COO- HydroxideOH - ChromateCrO 4 2 -Bicarbonate (hydrogen carbonate HCO 3 -Bisulfate (hydrogen sulfate) HSO 4 - DichromateCr 2 O 7 2 -CynideCN-SulfateSO 4 2 - Polyatomic Ions List

11 To write the formula of an ionic compound: 11 Use criss-cross method (bring valency of one element down as a subscript next to the other element). Write the formulas of the following: Sodium Sulfide (Na 2 S), Potassium Nitrate (KNO 3 ), Ferrous Sulfate Fe (SO 4 ), Ammonium Chloride (NH 4 Cl)

12 To name a molecular compound: 12 Write name of the first element followed by its oxidation state in parenthesis- Stock Way or you can use older Prefix Way. Naming Stock Way: CO 2 – Carbon (IV) Oxide Prefix Way: Carbon dioxide Note: Mono is not used before first element. Ex. CO is Carbon Monoxide and NOT Mono Carbon Monoxide. Please go over Oxidation Numbers.

13 Review of Oxidation Numbers (O.N.) 13 1.O.N of an ion is equal to the charge on that ion. 2.O.N. of a pure element is 0. 3.Sum of all oxidation numbers in a compound is equal to 0. 4.O.N. of H is generally +1, except in hydrides, where it is -1. 5.O.N. of O is generally -2, except in peroxides, where it is -1. 6.O.N. of halides is -1. Now some practice problems: i.What is the O.N. of P in PO 4 3- ion? ii.What is the O.N. of C in CO? iii.What is the O.N. of Fe in Fe(NO3)3? Note: O.N. for an element can vary in different compounds. Ex. C can have different O.N. in CO and CO2.

14 Naming Acids 14 To name an acid without oxygen: Starts with Hydro-followed by the name of anion ending in – ic Acid. Ex. HCl  Hydrochloric acid To name an acid with Oxygen (Oxyacids): Anion ending decides the name of the acid. If anion ends in –ate, then acid is –ic acid, if anion ends in –its, then acid is –ous acid. Ex. HClO 4  Perchloric Acid (anion perchlorate) HClO 3  Chloric Acid (anion Chlorate)

15 15 Naming Oxyacids & Oxyanions Oxyacid: polyatomic acid that contains a nonmetal bonded to one or more oxygen atoms Figure 4: The “standard” oxyacids (___ic acids) H 3 BO 3 H 2 CO 3 HNO 3 XX X H 3 PO 4 H 2 SO 4 HClO 3 H 3 AsO 4 H 2 SeO 4 HBrO 3 XHIO 3 Also: H 2 CrO 4 = chromic acid

16 Oxyanions: polyatomic anions that contain a nonmetal bonded to one or more oxygen atoms. Figure 5: Naming oxyacids and oxyanions Oxyacids Example Format Oxyanions Example Format Oxida -tion # Perchloric acid, HClO 4 Per_____ic acidPerchlorate, ClO 4 - per___ate +7 Chloric acid, HClO 3 _____ic acidChlorate, ClO 3 - ___ate +5 Chlorous acid, HClO 2 _____ous acidChlorite, ClO 2 - ___ite +3 Hypochlorous acid. HClO Hypo_____ous acid Hypochlorite, ClO - hypo___ite +1

17 Figure 6: Complete for sulfur oxyacids & oxyanions. OxyacidOxyanion Oxidation # (Persulfuric acid)(H 2 S 2 O 8 )(Persulfate)(S 2 O 8 2- )(+7) Sulfuric acidH 2 SO 4 SulfateSO 4 2- +6 Sulfurous acidH 2 SO 3 SulfiteSO 3 2- +4 Hyposulfurous acidH 2 SO 2 HyposulfiteSO 2 2- +2

18 18 Other Oxyacids Patterns H 3 PO 4 phosphoric acid H 2 PO 4 1- dihydrogen phosphate HPO 4 2- hydrogen (or monohydrogen) phosphate PO 4 3- phosphate H 2 CO 3 carbonic acid HCO 3 1- hydrogen carbonate or bicarbonate CO 3 2- carbonate

19 19 Naming Hydrates Name the compound, then the Greek prefix, and then add -hydrate. Ex:CuSO 4 ۰5 H 2 O copper (II) sulfate pentahydrate Or Cupric Sulfate pentahydrate

20 Chemistry of Coordination Compounds Brown, LeMay Ch 24 AP Chemistry Monta Vista High School

21 24.1: Structure of Complexes Complex: species in which a central metal ion (usually a transition metal) is bonded to a group of surrounding molecules or ions Ex. [Cu(NH 3 ) 4 ] 2+ Coordination compound: compound that contains a complex ion or ions. Ex. [Cu(NH 3 ) 4 ]Cl 2

22 A coordination compound, or complex, consists of: Metal ion Ligand or complexing agent: molecule or ion with a lone pair of e - that bonds to a metal ion. Ex. NH 3, CN -, S 2 O 3 2, SCN -, H 2 O

23 Naming Complexes 1.Name cation before anion; one or both may be a complex. (Follow standard nomenclature for non- complexes.) 2.Within each complex (neutral or ion), name all ligands before the metal. Name ligands in alphabetical order If more than one of the same ligand is present, use a numerical prefix: di, tri, tetra, penta, hexa, … Ignore numerical prefixes when alphabetizing.

24 Neutral ligands: use the name of the molecule (with some exceptions) NH 3 ammine-H 2 Oaqua- Anionic ligand: use suffix –o Br - bromo-CN - cyano- Cl - chloro- OH - hydroxo- 3.If the complex is an anion, use –ate suffix Record the oxidation number of the metal in parentheses (if appropriate). Ex: [Co(NH 3 ) 5 Cl]Cl 2 pentamminechlorocobalt (III) chloride

25 Nomenclature practice 1. K 4 [Fe(CN) 6 ] 2. [Cr(NH 3 ) 4 (H 2 O)CN]Cl 2 3. Na[Al(OH) 4 ] potassium hexacyanoferrate tetrammineaquacyanochromium (III) chloride sodium tetrahydroxoaluminate

26 Naming Compounds Flow Chart Does the formula start with H? NO YES Does it begin with a metal that has more than one oxidation number? (e.g. Fe, Ni, Cu, Sn, Hg) NOYES Does the formula contain a polyatomic ion? NOYES Are both elements nonmetals? NO YES Name the first element, Then the second element with an –ide ending. Name the first element using the proper prefix (never mono–). Name the second element with the proper prefix (including mono–) and –ide ending. 1 = mono– 4 = tetra– 7 = hepta– 10 = deca– 2 = di–5 = penta– 8 = octa– 3 = tri–6 = hexa–9 = nona– (not nano–) Name the first element, then the polyatomic ion. If two elements are present, name both, then the polyatomic ion (e.g. NaHCO 3 is sodium hydrogen carbonate). It is an acid (must be aqueous). Does the acid contain a polyatomic ion? NOYES Does the acid end with a polyatomic ion? –ite–ate Name the polyatomic ion, replacing the –ate ending with –ic. Add the word acid. Name the polyatomic ion, replacing the –ite ending with –ous. Add the word acid. Write the prefix hydro–, then the name of the second element with –ic ending. Add the word acid. Name the first element followed by its oxidation number (Roman Numeral) or “old school” –ic or –ous endings.

27 Practice Websites for Naming 27 c.html s.tdf?0


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