Binary Molecular Compounds Compounds made by two different

Binary Molecular Compounds: Compounds made by two different nonmetals. Examples: CO 2 HBr P 2 O 5

Naming Binary Molecular Compounds: 1)The first element in the formula is always named first, using the entire element name. 2) The second element in the formula is named using the root of the element & adding the suffix –ide. 3) Prefixes are used to indicate the number of atoms of each type that are present in the compound.

Prefixes # of atoms Mono ------ one Di -------- two Tri -------- three Tetra ------ four Penta------ five Hexa ------- six Hepta –----- seven Octa ------- eight Nona ------- nine Deca ------- ten

Naming Binary Molecular Compounds: EXAMPLES: N 2 O 5 – dinitrogen pentoxide. H 2 O -- dihydrogen monoxide. N 2 O -- dinitrogen monoxide. CO 2 -- carbon dioxide. PCl 5 -- phosphorus pentachloride. SO 3 -- sulfur trioxide. NH 3 -- nitrogen trihydride.

Writing Formulas (Molecular Compounds): 1) Write the element symbols in the same order than it appears in the compound name. 2) Use subscripts to represent the number of atoms of each element indicated by the prefixes used. Dinitrogen tetroxide ------ N 2 O 4 Dihydrogen monoxide ------ H 2 O Diphosphorus monoxide ---- P 2 O Carbon monoxide ------ CO Phosphorus trichloride ----- PCl 3

Practice: 1) CCl 4 ---- Carbon tetrachloride. 2) Phosphorus tribromide –- PBr 3 3) CO ----- Carbon monoxide. 4) Dichlorine pentoxide ---- Cl 2 O 5 5) HI(g) --- Hydrogen iodide. 6) Hydrogen chloride--- HCl(g)

II - Write the formulas of the following: Dinitrogen tetroxide -----Dihydrogen monoxide -----Diphosphorus monoxide ---Carbon monoxide ------Phosphorus trichloride ----III - Write the names or the formulas for: 1) CCl 4 ---2) Phosphorus tribromide – 3) CO ----4) Dichlorine pentoxide ---5) HI(g) --6) Hydrogen chloride---