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UNIT 6 BONDING AND NOMENCLATURE LESSON 3 NAMING COMPOUNDS.

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Presentation on theme: "UNIT 6 BONDING AND NOMENCLATURE LESSON 3 NAMING COMPOUNDS."— Presentation transcript:

1 UNIT 6 BONDING AND NOMENCLATURE LESSON 3 NAMING COMPOUNDS

2 Chemist name compounds according to the atoms and bonds that compose the compound. NAMING COMPOUNDS

3 Naming Ionic Compounds Name the cation first, then anion Monatomic cation = name of the element Monatomic cation = name of the element Ca 2+ = calcium Monatomic anion = root + -ide Monatomic anion = root + -ide Cl  = chloride CaCl 2 = calcium chloride

4 Naming Ionic Compounds some metals can form more than one charge (usually the transition metals) use a Roman numeral in their name: PbCl 2 – use the anion to find the charge on the cation (chloride is always 1-) Pb 2+ is the lead (II) cation PbCl 2 = lead (II) chloride (Metals with multiple oxidation states)

5 Practice by writing the formula or name as required… Iron (II) Phosphate Tin (II) Fluoride (sometimes called Stannous) (sometimes called Stannous) Potassium Sulfide Ammonium Chromate MgSO 4 FeCl 3

6 Practice by naming compund MgSO 4 FeCl 3

7 Naming and Writing Formulas for Molecular Compounds

8 Molecular compounds are… made of just nonmetals smallest piece is a molecule can’t be held together by opposite charge attraction can’t use charges to figure out how many of each atom(there are no charges)

9 Molecular compounds - Formulas are easy! Molecular compounds: the name tells you the number of atoms. –Uses prefixes to tell you the exact number of each element present!

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

11 Write formulas for these: diphosphorus pentoxide tetraiodine nonoxide sulfur hexafluoride nitrogen trioxide carbon tetrahydride phosphorus trifluoride aluminum chloride (Ionic compound)

12 Naming Molecular Compounds To write the name: 1. 1 st element: Prefix +name (least electronegative). electronegative) nd element: Prefix +name (more electronegative) change ending electronegative) change ending to -ide to -ide One exception - we don’t write mono if there is only one of the first element. One exception - we don’t write mono if there is only one of the first element. Normally, we do not have double vowels when writing names (oa oo)

13 Practice by naming these: N2ON2ON2ON2O NO 2 Cl 2 O 7 CBr 4 CO 2 BaCl 2 (This one will not use prefixes, since it is an ionic compound!) = dinitrogen monoxide (also called nitrous oxide or laughing gas) = nitrogen dioxide = dichlorine heptoxide = carbon tetrabromide = carbon dioxide

14 Naming Hydrates

15 Hydrates are ionic compounds that absorb water into their solid structures. Anhydrous are ionic compounds that are free of water. The name of the hydrated compound must reflect how many water molecules are attached (use prefixes)

16 Practice Naming Hydrates CuSO 4 ● 5H 2 O Copper II Sulfate pentahydrate Copper II Sulfate pentahydrate Fe PO 4 ● 4H 2 O Iron III Phosphate tetrahydrate Iron III Phosphate tetrahydrate

17 Helpful to remember In an ionic compound, the net ionic charge is zero (criss-cross method) 2. An -ide ending generally indicates a binary compound 3. An -ite or -ate ending means there is a polyatomic ion that has oxygen 4. Prefixes generally mean molecular; they show the number of each atom

18 Helpful to remember A Roman numeral after the name of a cation is the ionic charge of the cation


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