Study Guides Covalent Compounds

Naming and Formula Writing: Covalent Compounds Vocabulary Metal - elements in the middle and left side of the periodic table, lose eNonmetal - elements in the right side of the periodic table, gain eSubscript - numbers to the lower right of the element symbol, indicates the number of atoms in the ratio of the compound Prefix - addition placed on the front of a word to modify the meaning of the word; in naming covalent chemical compounds the prefix usually matches the subscript Knowledge Goals: • • • Identify a compound as covalent (made of only non-metals) Name a covalent compound given its chemical formula Give the chemical formula for a covalent compound given its name Covalent Compounds Observe how chemical formulas and names are created for the covalent compounds below. Fill in blanks below based on the patterns that you see. Ex. CO2 has one Carbon atom and 2 oxygen atoms. Naming Covalent Compounds Goal#1: Name a covalent compound given its chemical formula Writing Names from Formulas Check to see that both elements are nonmetals Use prefixes to indicate how many atoms are present Name the first element: prefix with its full name Name the second element: prefix with element name, change the ending to -ide Do not use “mono” when naming the first element Example: CS2 Elements: 1 Carbon and 2 Sulfur Name: Carbon disulfide Prefixes: 1. _ mono__ 2. __ di_____ 3. ___tri____ 4. ___tetra___ 5. ___penta___ 6. ___hexa___ 7. ___hepta or septa 8. ___octo___ 9. ___nona___ 10.___deca___ _ _carbon monoxide__ CO PCl ___phosphorus trichloride_ NO ___dinitrogen monoxide__ CO 2 ___carbon dioxide_ 3 ___sulfur trioxide_ 3 2 SO 2 5 ___diphosphorus pentoxide_ NO 2 ____nitrogen dioxide_ PO ____sulfur hexafluoride_ SF 6 NF 3 ____nitrogen trifluoride_ Goal #2 Give the chemical formula for a covalent compound given its name Writing Formulas from Names • • • Identify the elements Identify prefixes for each element Use the prefix for each element as that element’s subscript in the formula. Diphosphorous monosulfide __P2S____ Sulfur dioxide __SO2_____ Diphosphorous trioxide __P2O3____ Sulfur tetrafluoride __SF4____ Nitrogen triiodide __NI3____ Carbon tetrabromide __CBr4____ Nitrogen monoxide __NO_____ Phosphorous hexabromide __PBr6____ Tetraphosphorous decoxide __P4O10____ Dinitrogen pentoxide __N2O5____ Naming Covalent Compounds Practice Goal#1: Name a covalent compound given its chemical formula Goal #2: Give the chemical formula for a covalent compound given its name Goal#1: Name a covalent compound given its chemical formula • Write the name of each of the following covalent compounds. Na.2O dinitrogen monoxide SO e. 3 sulfur trioxide SO b. 2 sulfur dioxide OCl f. 2 oxygen dichloride Nc.2O5 dinitrogen pentoxide Ng. 2O4 dinitrogen tetroxide CBr d. 4 carbon tetrabromide Ph. 4O10 tetraphosphorus decoxide AsF e. 5 arsenic pentafluoride XeF i. 4 NO f. nitrogen monoxide xenon tetrafluoride Goal #2 Give the chemical formula for a covalent compound given its name • Write the formula of each of the following covalent compounds. a. __NI3__ Nitrogen triiodide __H e. 2O__ Dihydrogen monoxide __N b. 2O4_ Dinitrogen tetraoxide ___PCl f. 3_ Phosphorous trichloride __B c. 6Si Hexaboron monosilicide __SbBr g. 3 Antimony tribromide ___CO__ Carbon monoxide d. __IF h. 5 Iodine pentafluoride ___BCl e. 3_ __SbCl i. 5 Antimony pentachloride • Boron trichloride Write the formula and the name of the following molecular compounds below.