B.9 Continued-ish

In which you will learn about:•Naming covalent (molecular)

compounds

Naming Molecular Compounds

CH4 methaneBCl3 boron trichloride

CO2 Carbon dioxide

All are formed from two or more nonmetals.

Ionic compounds generally involve a metal and nonmetal (NaCl)

Molecular (Covalent) Nomenclaturefor two nonmetals

• Prefix System (binary compounds)

1. Less electronegative atom comes first.

2. Add prefixes to indicate # of atoms. Omit mono- prefix on the FIRST element. Mono- is OPTIONAL on the SECOND element (in this class, it’s NOT optional!).

3. Change the ending of the second element to -ide.

PREFIXmono-di-tri-tetra-penta-hexa-hepta-octa-nona-deca-

NUMBER123456789

10

Molecular Nomenclature Prefixes

• CCl4

• N2O

• SF6

• carbon tetrachloride

• dinitrogen monoxide

• sulfur hexafluoride

Molecular Nomenclature: Examples

• arsenic trichloride

• dinitrogen pentoxide

• tetraphosphorus decoxide

• AsCl3

• N2O5

• P4O10

More Molecular Examples

Learning Check

Fill in the blanks to complete the following names of covalent compounds.

CO carbon ______oxide

CO2 carbon _______________

PCl3 phosphorus _______chloride

CCl4 carbon ________chloride

N2O _____nitrogen _____oxide

Learning Check

1. P2O5 a) phosphorus oxide

b) phosphorus pentoxidec) diphosphorus pentoxide

2. Cl2O7 a) dichlorine heptoxide

b) dichlorine oxidec) chlorine heptoxide

3. Cl2 a) chlorine

b) dichlorinec) dichloride

Overall strategy for naming chemical compounds.

A flow chart for naming binary compounds.

Mixed Review

Name the following compounds:1. CaO

a) calcium oxide b) calcium(I) oxidec) calcium (II) oxide

2. SnCl4

a) tin tetrachloride b) tin(II) chloride c) tin(IV) chloride

3. N2O3

a) nitrogen oxide b) dinitrogen trioxidec) nitrogen trioxide

Mixed Practice

1. Dinitrogen monoxide2. Potassium sulfide3. Copper (II) nitrate4. Dichlorine heptoxide5. Chromium (III) sulfate6. Iron (III) sulfite7. Calcium oxide8. Barium carbonate9. Iodine monochloride

Mixed Practice

1.1. BaIBaI22

2.2. PP44SS33

3.3. Ca(OH)Ca(OH)22

4.4. FeCOFeCO33

5.5. NaNa22CrCr22OO77

6.6. II22OO55

7.7. Cu(ClOCu(ClO44))22

8.8. CSCS22

9.9. BB22ClCl44