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Nomenclature Notes

Nomenclature Notes. I. Writing Formulas for Binary Molecular Compounds- those containing 2 nonmetals. Prefix naming system - know theses prefixes: mono – one di – two tri – three tetra – four penta - five hexa – six hepta – seven octa - eight nona – nine deca – ten.

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Nomenclature Notes

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  1. Nomenclature Notes I. Writing Formulas for Binary Molecular Compounds-those containing2 nonmetals. Prefix naming system - know theses prefixes: mono – one di – two tri – three tetra – four penta - five hexa – six hepta – seven octa - eight nona – nine deca – ten

  2. Simply write what it says. Ex: phosphorus pentachloride PCl5 dihydrogen monoxide H2O Practice: nitrogen tetrasulfide ______________ carbon dioxide ________________ oxygen monofluoride _____________ sulfur hexachloride __________________ trioxygen decanitride ______________ tetrafluorine monophosphide ___________ hexafluorine nonasulfide ___________ heptabromine octanitride ____________

  3. II. Writing Names for Binary Molecular Compounds 1. The less electronegative element is given first. It is given a prefix only if it contributes more than one atom to a molecule of the compound. (All this means is that you will never start with mono-) 2. The second element is named by combining a prefix indicating the number of atoms contributed by the element to the root of the name of the second element and then adding –ide to the end. The o or a at the end of a prefix is usually dropped when the word following the prefix begins with another vowel. (monoxide or pentoxide) Common Roots H: hydr C: carb N: nitr O: ox F: flor Si: silic P: phosph S: sul Cl: chlor Br: brom I: iod

  4. Practice: CCl4 _________________________ NF3 _______________________ PBr5_________________________ SF6_____________________________ SO3 _________________________ PCl5 _______________________ N2O_________________________ PF6_____________________________

  5. III. Nomenclature – Ionic Compounds

  6. A. Naming system for Ionic Compounds There are two naming systems currently acceptable: • IUPAC – International Union of Practical and Applied Chemistry is the newest system-this system uses Roman numerals to give the charges or oxidation number of positive ions ONLY if the positive ion has variable charges. This is the system we will use.

  7. 2. “ous” and “ic” system – oldest system and still very commonly used. May be used ONLY if the positive ion has a variable charge and exhibits only 2 oxidation numbers. Review the 4 ions with which we may use this system. Cu ____ _________ _____ ________ Sn ____ _________ _____ ________ Fe ____ _________ _____ ________ Pb ____ _________ _____ ________

  8. A. Rules for Writing Names for Binary Ionic Compounds – these are compounds containing only 1 metal and 1 nonmetal. 1. The correct full name of the cation (metal ion) is written first. (Do not forget about the roman numerals if it is a Cu, Fe, Sn, or Pb ion!) • The last syllable in the anion (nonmetal ion) is dropped and –ide is added. Example: NaCl Sodium Chloride Example: CuS Copper (II) Sulfide or Cupric Sulfide

  9. Practice: MgCl2 ___________________________ AlI3 _____________________________ Na3P _____________________________ Ca3N2 _______________________________ FeN _____________________________ PbCl2 ________________________________ CuF ____________________________

  10. CuCl2 _________________________________ ZnS ______________________________ Pb02 _________________________________ Fe203 _____________________________ KI ___________________________________ Cu0 ______________________________ Cs3N ________________________________

  11. A. Rules for Writing Formulas for Binary Ionic Compounds – these are compounds containing only 1 metal and 1 nonmetal. 1. Write the cation (metal ion) first and the anion (nonmetal ion) second. • Determine the charge of each (from it’s position on the periodic table) • Criss-cross the charges to make the compound = 0 • Reduce, if necessary

  12. Example: Write the formula for sodium chloride. Na+1 Cl1- NaCl charges equal 0 Example: Write the formula for aluminum oxide. Al3+ O2- Al2O3 charges equal 0

  13. Practice: Magnesium phosphide____________________ iron(II) bromide______________________ Calcium oxide __________________________ sodium sulfide _____________________ Copper (II) iodide __________________________ lead (IV) nitride ____________________ Aluminum nitride _______________________

  14. tin (II) chloride _________________ Potassium fluoride __________________________ Copper (I) phosphide ________________ Copper (II) oxide ___________________________ potassium bromide __________________ Iron (III) fluoride _______________________ Tin (II) oxide ______________________

  15. III. Ternary Ionic Compounds

  16. Rules for Writing Formulas for Ternary Ionic Compounds – these are compounds containing polyatomic ions. Polyatomic Ions-two or more elements (usually nonmetals) bonded together that have collectively lost or gained electrons and now have a charge.

  17. 1. Write the cation (+) first and the anion (-) second. • Determine the charge of each (from it’s position on the periodic table or from your chart) • Criss-cross the charges to make the compound = 0 Use parenthesis if you have a subscript >1 on a polyatomic ion • Reduce, if necessary Example: Write the formula for sodium phosphate. Na1+ (PO4)3- Na3PO4 Ammonium sulfide (NH4)1+ S2- (NH4)2S

  18. Practice: aluminum sulfate _______________ potassium chlorate ______________ Copper (II) acetate ______________________ plumbous nitrate _______________________ Iron (III) oxalate _______________________ magnesium chlorate _____________________ Magnesium dichromate __________________

  19. tin (II) hypochlorite ____________________ Lead (II) perchlorate__________________ tin (II) nitrite _________________________ Ammonium carbonate___________________ iron (II) sulfite _________________________ Sodium cyanide ___________________ Lithium phosphite _____________________

  20. B. Rules for Writing Names for Ternary Ionic Compounds - these are the compound containing polyatomicions 1. The correct full name of the cation (metal ion or polyatomic ion) is written first. (Do not forget about the roman numerals if it is a Cu, Fe, Sn, or Pb ion!) 2. The correct full name of the anion (polyatomic ion or nonmetal ion) is written second. If the anion is a polyatomic ion do not change the ending. If the anion is a nonmetal ion then the ending is dropped and –ide is added. Example: KNO3 potassium nitrate Example: Cu2CrO4 copper (I) chromate or cuprous chromate

  21. Practice: Na3PO4_______________________ Al2(SO4)3 _________________________________ CuNO3 _______________________ PbCO3 __________________________________ Li2SO3 ________________________

  22. CaCr207 _______________________________ NH4Cl_________________________ CsClO4 __________________________________ K2CN ________________________ Fe(HSO3)3 _______________________________

  23. Let’s Review: Binary Ionic Compounds (BIC): 2 elements, one is a metal and one a nonmetal, will end with –ide, use periodic table to look up ions formed to determine the formula Ternary Ionic Compounds (TIC): 3 or more elements, at least one is a metal and at least one is a nonmetal, these will contain a polyatomic ion (memorize the polyatomic ions), use the ions charge to determine the formula

  24. CaCO3 _______________________ Mg3P2 _______________________ Cu(NO2)2 _______________________ CuCl _______________________

  25. Magnesium permanganate ________ Barium fluoride ________ Iron (III) nitrate ________ Sulfuric acid ________ Lead (IV) fluoride ________

  26. Mixed Review: Write the name for the following: CuO BaO CaCl2 NaBr K2O Mg3N2 AgOH Pb(ClO)4 CaSO3 Sr(NO3)2 Write the formula for the following: potassium iodide iron (II) chloride sodium sulfide aluminum sulfide copper (II) nitride potassium oxide lead (IV) oxalate magnesium phosphite sodium bicarbonate

  27. Mixed Review: Write the name for the following: CuO BaO CaCl2 NaBr K2O Mg3N2

  28. Mixed Review: Write the name for the following: AgOH Pb(ClO)4 CaSO3 Sr(NO3)2

  29. Mixed Review: Write the formula for the following: potassium iodide iron (II) chloride sodium sulfide aluminum sulfide copper (II) nitride potassium oxide

  30. Mixed Review: lead (IV) oxalate magnesium phosphite sodium bicarbonate

  31. Part 4: Percent Composition, A. Molar Mass Practice: • Find the molar mass of ammonium sulfate (also called the formula mass): • Find the molar mass of copper (II) chloride:

  32. B. Percent Composition by Mass – the percent, by mass, of each element in a compound. • If you have a box containing 100 golf balls and 100 ping pong balls, which type of ball contributes the most to the mass of the box? • The same principle applies to finding the % composition of a compound. Different elements have different masses and this must be taken into consideration.

  33. How to find the percent composition of a compound: • Write a correct formula for the compound • Find the molar mass of the compound 3. Divide the total atomic mass of EACH ELEMENT by the molar mass 4. Multiply by 100 to convert your results to a percent 5. Since you have no significant figures to go by, express your answer to TWO decimal places with the % sign.

  34. % = part X 100whole % = mass of element X 100 mass of compound

  35. Practice: • Find the percentage composition by mass of zinc carbonate, ZnCO3:

  36. Find the percentage of nitrogen by mass in ammonium nitrate, NH4NO3

  37. Find the percentage composition by mass of aluminum oxalate, Al2(C2O4)3

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