What’s in a name? When two people use different names for the same thing, misunderstood words are apt to happen. The British and Americans often get confused.

Nomenclature A System of Naming Compounds Compounds are two or more atoms of different elements bonded together. Even though the gases O2, N2, F2, and Cl2 travel in pairs, their names are simply oxygen, nitrogen, fluorine, and chlorine. Diatomic molecules!! HOFBRICL the clown or “the seven”

Diatomic Molecule “di” means “two” Diatomic molecule contains two atoms Ex. Fluorine molecule F2

NOMENCLATURE NON-METAL COMPOUNDS

NOMENCLATURE OF COVALENT COMPOUNDS WITH 2 ELEMENTS BINARY

Theory Compounds are composed of two or more elements chemically combined with a neutral charge. Binary compounds contain only two types of atoms. The names of all binary compounds always end in “-ide”. If a binary compound contain two different non-metallic elements, then prefixes are used to indicate the number of atoms.

mono- 1 hexa- 6 di- 2 hepta- 7 tri- 3 octa- 8 tetra- 4 nona- 9 In order to be effective in using prefixes to name compounds containing two non-metals, these prefixes must be committed to memory: mono- 1 hexa- 6 di- 2 hepta- 7 tri- 3 octa- 8 tetra- 4 nona- 9 penta- 5 deca- 10

When naming compounds using prefixes: Remember the formulas are written just like the names and the names just like the formulas. The only difference is that the prefixes in the name are written as subscripts in the formula. Remember: when there is only one of the first atom a prefix is not used.

Example #1-Names to Formulas I’m a Binary Compound Sulfur trioxide 1. Write symbols of elements S O 1 3 2. Write number of atoms If no prefix, then 1 is implied and not written Final Formula

Example #2-Names to Formulas I’m a Binary Compound dichlorine heptaoxide 1. Write symbols of elements Cl O 2 7 2. Write number of atoms Final Formula

Example #3-Names to Formulas I’m a Binary Compound oxygen difluoride 1. Write symbols of elements O F 1 2 2. Write number of atoms If no prefix, then 1 is implied and not written Final Formula

Example #4-Names to Formulas I’m a Binary Compound dinitrogen tetraoxide 1. Write symbols of elements N O 2 4 2. Write number of atoms Final Formula

Example #5-Names to Formulas I’m a Binary Compound phosphorus pentachloride 1. Write symbols of elements P Cl 5 2. Write number of atoms If no prefix, then 1 is implied and not written Final Formula

Example #6-Names to Formulas I’m a Binary Compound dinitrogen monoxide 1. Write symbols of elements N O 2 2. Write number of atoms If no prefix, then 1 is implied and not written Final Formula

Example #7-Names to Formulas I’m a Binary Compound carbon monoxide 1. Write symbols of elements C O 2. Write number of atoms If no prefix, then 1 is implied and not written Final Formula

Example #8-Names to Formulas I’m a Binary Compound sulfur hexafluoride 1. Write symbols of elements S F 6 2. Write number of atoms Final Formula

Example #10-Names to Formulas I’m a Binary Compound dinitrogen trisulfide 1. Write symbols of elements N S 2 3 2. Write number of atoms Final Formula

Examples #1- Formulas to Names 1. Write names of elements 2. Write number of atoms I’m a Binary Compound CCl4 mono carbon tetra chlor ide ine If first prefix is mono, it is implied and not written Final Name

Examples #2- Formulas to Names 1. Write names of elements 2. Write number of atoms I’m a Binary Compound XeF3 mono xenon tri fluor ide If first prefix is mono, it is implied and not written Final Name

Examples #4- Formulas to Names 1. Write names of elements 2. Write number of atoms I’m a Binary Compound AsI3 mono arsenic tri iod ide If first prefix is mono, it is implied and not written Final Name

Examples #6- Formulas to Names 1. Write names of elements 2. Write number of atoms I’m a Binary Compound IF5 iodine penta fluor ide Final Name

Examples #8- Formulas to Names 1. Write names of elements 2. Write number of atoms I’m a Binary Compound N2S5 di nitrogen penta sulf ide Final Name

Examples #9- Formulas to Names 1. Write names of elements 2. Write number of atoms I’m a Binary Compound SiCl4 silicon tetra chlor ide Final Name

Practice Problem #1 No, "Cl" is not carbon & iodine, see element list ClF3 Choose the correct name for the compound 1. carbon iodine trifluoride No, "Cl" is not carbon & iodine, see element list 2. chlorine trifluorine No, all binary compounds end with "ide" 3. chlorine trifluoride Very good, click arrow to continue 4. chlorine tetrafluoride No, you need to review prefixes 5. none of the above No, there is a correct answer next problem Element List Prefixes

Practice Problem #2 Very good, click arrow to continue arsenic pentabromide Choose the correct formula for the compound 1. AsBr5 Very good, click arrow to continue 2. ArBr5 No, "Ar" is not correct, see element list 3. AsBr7 No, you need to review prefixes 4. As5Br No, the subscript is with the wrong element 5. none of the above No, there is a correct answer next problem Element List Prefixes

Practice Problem #3 No, you need to use more prefixes Choose the correct name for the compound 1. nitrogen trioxide No, you need to use more prefixes 2. dinitride trioxide No, only the last element ends with "ide" 3. dinitrogen trioxygen No, all binary compounds end in "ide" 4. dinitrogen trioxide Very good, click arrow to continue 5. none of the above No, there is a correct answer next problem Prefixes

Practice Problem #6 No, you don't have any subscripts dichlorine monoxide Choose the correct formula for the compound 1. ClO No, you don't have any subscripts 2. Cl2O Very good, click arrow to continue 3. ClO2 No, you have the wrong subscripts 4. Cl2O2 No, you have the wrong subscripts 5. none of the above No, there is a correct answer next problem Prefixes

Tetraphosphorus decaoxide Practice Problem #8 Tetraphosphorus decaoxide Choose the correct formula for the compound 1. P4O10 Very good, click arrow to continue 2. P6O10 No, you have the wrong subscripts 3. 4PO10 No, this says that there are 4 molecules 4. P2O5 No, you have the wrong subscripts 5. none of the above No, there is a correct answer next problem Prefixes

Practice Problem #11 No, "mono" is used only for the last element Choose the correct name for the compound 1. mononitrogen monoxide No, "mono" is used only for the last element 2. nitrogen monoxygen No, all binary compounds end in "ide" 3. mononitrogen oxide No, "mono" is used only for the last element 4. nitride monoxide No, only the last element ends in "ide" 5. none of the above Very good, click arrow to continue next problem This is nitrogen monoxide

Practice Problem #16 No, "S" is not correct, see element list silicon tetrabromide Choose the correct formula for the compound 1. SBr4 No, "S" is not correct, see element list 2. ScBr4 No, "Sc" is not correct, see element list 3. SiB4 No, "B" is not correct, see element list 4. SiBr6 No, you need to review prefixes 5. none of the above Very good, click the arrow to continue next problem The correct formula is SiBr4 Element List Prefixes

Practice Problem #17 Very good, click arrow to continue S4N4 Choose the correct name for the compound 1 tetrasulfur tetranitride Very good, click arrow to continue 2. tetrasulfur nitride No, the "nitride" needs a prefix 3. trisulfur trinitride No, you need to review prefixes 4. tetrasulfur tetranitrogen No, all binary compounds end in "ide" 5. none of the above No, there is a correct answer next problem Prefixes

Practice Problem #19 No, you do not use "mono" for the first element BF3 Choose the correct name for the compound 1. monoboron trifluoride No, you do not use "mono" for the first element 2. boron trifluorine No, all binary compounds end with "ide" 3. boron trifluoride Very good, click arrow to continue 4. bromine trifluoride No, "Br" is not correct, see element list 5. none of the above No, there is a correct answer Element List

tetraphosphorus decasulfide Practice Problem #20 tetraphosphorus decasulfide Choose the correct formula for the compound 1. P6S9 No, you need to review prefixes 2. P4S9 No, you need to review prefixes 3. P4Si10 No, "Si" is not correct, see element list 4. Ph4S10 No, "Ph" is not correct, see element list 5. none of the above Very good, click arrow to continue next problem The correct formula is P4S10 Element List Prefixes

dual properties H H B Al Si Ge As Sb Te Po At

Element List return 1 Actinium Ac 2 Aluminum Al 4 Argon Ar 5 Arsenic As 6 Astatine At 7 Barium Ba 9 Beryllium Be 10 Bismuth Bi 12 Boron B 13 Bromine Br 14 Cadmium Cd 15 Calcium Ca 17 Carbon C 18 Cerium Ce 19 Cesium Cs 20 Chlorine Cl 21 Chromium Cr 22 Cobalt Co 23 Copper Cu 24 Fluorine F Francium Fr 24 Gallium Ga Germanium Ge Gold Au Helium He Hygrogen H Indium In Iodine I Iridium Ir Iron Fe Krypton Kr Lanthanum La Lead Pb Lithium Li Magnesium Mg Manganese Mn Mercury Hg Molybddenum Mo Neon Ne Nickel Ni Niobium Nb Nitrogen N Osmium Os Oxygen O Palladium Pd Phosphorus P Platinum Pt Plutonium Pu Polonium Po Potassium K Radium Ra Radon Rn return

Prefixes mono- 1 hexa- 6 di- 2 hepta- 7 tri- 3 octa- 8 tetra- 4 nona- 9 penta- 5 deca- 10 return