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Chapter 2 Read pages 43-44Chapter 2 Read pages 43-44 WS: Naming moleculesWS: Naming molecules Webassign Unit 3 Due Wednesday Webassign Unit 3 Due Wednesday

1/23 at 10 pm1/23 at 10 pm Test Review Due on test day in class!Test Review Due on test day in class! Test Dates: Jan. 24 or 25Test Dates: Jan. 24 or 25

NH4Cl ammonium chlorideFe2S3 iron(III) sulfide ferric sulfideHMnO4 permanganic acidHg2S mercury(I) sulfide mercurous sulfideH2Cr2O7 dichromic acidSnO2 tin(IV) oxide stannic oxideAl(NO2)3 aluminum nitriteRbI rubidium iodide(NH4)2CO3 ammonium carbonateMnCr2O7 manganese(II) dichromate manganous

dichromateCo3N2 cobalt(II) nitride cobaltous nitrideAg2C2O4 silver oxalate(NH4)2HPO4 ammonium hydrogen

phosphateammonium biphosphate

Cu(OH)2 copper(II) hydroxide cupric hydroxide

Ca(ClO4)2 calcium perchlorateCrSO3 chromium(II) sulfite chromous sulfiteAg3PO3 silver phosphitePb(C2H3O2)4 lead(IV) acetate plumbic acetateH2SiO3 silicic acidMn(MnO4)3 manganese(III)

permanganatemanganic permanganate

NH4C2H3O2 ammonium acetateCs2Cr2O7 cesium dichromateHMnO4 permanganic acid

BINARY MOLECULAR BINARY MOLECULAR COMPOUNDSCOMPOUNDS

composed of nonmetalscomposed of nonmetals electrons are shared (covalent): electrons are shared (covalent):

NO CHARGES NO CHARGES no criss-cross methodno criss-cross method do not reduce subscriptsdo not reduce subscripts can combine in more than one waycan combine in more than one way

NAMING BINARY NAMING BINARY MOLECULESMOLECULES

prefixes used to denote multiple prefixes used to denote multiple atoms of one element in a moleculeatoms of one element in a molecule

5

4

3

2

1

10

9

8

7

6

deca-

nona-

octa-

hepta-

hexa-

penta-

tetra-

tri-

di-

mono-

22ndnd element in name ends in –ide element in name ends in –ide for oxides: generally for mono, use for oxides: generally for mono, use

only one “o”only one “o” monooxide becomes monoxidemonooxide becomes monoxide

NAMING BINARY NAMING BINARY MOLECULESMOLECULES

if there is ONE atom of the first if there is ONE atom of the first element, omit the prefix monoelement, omit the prefix mono––

ex: ex: COCO

carbon monoxidecarbon monoxide

NOT monocarbon NOT monocarbon monooxidemonooxide

NAMING BINARY NAMING BINARY MOLECULESMOLECULES

NAMING BINARY NAMING BINARY MOLECULESMOLECULES

dichlorine octaoxideCl2O8

dinitrogen monoxideN2O

carbon dioxideCO2

carbon monoxideCO

WRITING NAMESWRITING NAMES

sulfur trioxideSO3

tetraphosphorus decaoxideP4O10

dinitrogen pentaoxideN2O5

oxygen difluorideOF2

WRITING FORMULASWRITING FORMULAS

CCl4carbon tetrachloride

N2O4dinitrogen tetraoxide

S2Cl2disulfur dichloride

NF3nitrogen trifluoride

MOLECULAR FORMULAMOLECULAR FORMULA diatomicdiatomic molecules: molecules with molecules: molecules with

2 atoms of the same element2 atoms of the same element there are 7 – know them!there are 7 – know them!

NN22 O O22 H H22 Cl Cl22 I I22 F F22 Br Br22

oror

BrBr22 I I22 N N22 Cl Cl22 H H22 O O22 F F22

Electronegativity and PolarityElectronegativity and Polarity

Electronegativity= ability of an atom Electronegativity= ability of an atom to attract electrons in a covalent to attract electrons in a covalent bond.bond.

Most electronegative element = Most electronegative element = Least electronegative element =Least electronegative element = Unequal sharing of electrons will Unequal sharing of electrons will

produce a polar bond.produce a polar bond.

ExamplesExamples