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SNC2D - Chemistry Molecular Compounds Covalent or Molecular compounds form when two non-metals combine. Molecular compounds have properties that distinguish them from non-metals. Solubility in water – __________ are soluble in water, but most are _______. Melting and boiling point – the forces holding the molecules together are quite ________– they have ________ melting and boiling points Conducitivity – molecular compounds do not form ________. Therefore they ____________ conduct electricity when dissolved in water. Systemic Names (Prefix System) Prefix mono di tri tetra penta hexa hepta octa nona Deca Number Writing Formulas: Examples: 1. Write the symbol of each element in the same order as in the name. 2. The prefix of each element indicates the number of atoms in the formula, so the formula needs a subscript that matches the prefix (no prefix means a subscript of 1). Do not cross-over any numbers. dinitrogen pentoxide carbon dioxide ___________________________ ____________________________ Writing Names: 1. Given the formula, write the name of each element in the same order. 2. Use the subscripts to determine the prefix for each element in the name. If there is no subscript, use the prefix “mono” (“mono” can be left off of the first element). Examples: PCl5 NF3 ___________________________ ____________________________ 1 SNC2D - Chemistry Practice I. Write the correct formulas for the following: 1. nitrogen pentachloride 6. silicon tetrachloride 2. silicon tetrabromide 7. carbon monoxide 3. arsenic trioxide 8. diarsenic trisulfide 4. carbon disulfide 9. phosphorus hexafluoride 5. carbon tetrachloride 10. dihydrogen monoxide Practice II. Write 2 names for the following, using IUPAC and prefix rules 1. AsI3 6. SiBr4 2. CCl4 7. N2S3 3. NH3 8. SiO2 9. PF3 4. CS 10. CCl4 5. P2S5 PUTTING IT ALL TOGETHER Names and Formulae 1. Write the formula for each of the following compounds. a. calcium fluoride _______________ k. potassium sulphate ____________ b. carbon disulfide _______________ l. _______________ c. nitrogen triodide _______________ m. aluminum hydroxide ______________ d. sodium phosphide _______________ n. fluorine gas _______________ e. dichlorine monoxide _______________ o. silicon dioxide _______________ f. iron (III) carbonate _______________ p. calcium hydroxide _______________ barium nitride 2 SNC2D - Chemistry g. copper (II) sulfate 2. _______________ q. nitrogen gas _____________ h. diphosphorus pentasulphide __________ r. copper (I) nitrate _______________ i. tin (IV) chloride _______________ s. sulphur trioxide _______________ j. magnesium chlorate _______________ t. barium oxide _______________ Write the names for the following compounds. a. CCl4 _____________________________ k. NaNO3 __________________________ b. Mg(ClO3)2 ________________________ l. PCl5 ____________________________ c. PBr3 _____________________________ m. PF3 ____________________________ d. H2 gas ____________________________ n. Sn(OH)2 _________________________ e. PbS2 _____________________________ o. FeCl2 ___________________________ f. Al2(CO3)3 _________________________ p. N2O g. Na2SO4 _________________________ q. CuClO3 ___________________________ h. Na2O ____________________________ r. Li3PO4 __________________________ i. Al2(SO4)3 __________________________ s. SnO ____________________________ j. H2SO4 (aq) __________________________ t. OF2 ___________________________ ___________________________ 3