unit 6b: naming and writing formulas for ionic and covalent compounds
TRANSCRIPT
![Page 1: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/1.jpg)
Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds
![Page 2: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/2.jpg)
Polyatomic Ions
Polyatomic ions are groups of atoms that are covalently bonded and have a charge.• PO4
3- = phosphate ion
• SO42- = sulfate ion
![Page 3: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/3.jpg)
Polyatomic Ions
Ending of –ate or –ite means there are oxygen atoms in the formula of the ion. • SO4
2- = sulfate
• SO32- = sulfite
![Page 4: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/4.jpg)
Polyatomic Ions
The –ate ending always has one more oxygen than the –ite ending.
SO42- = sulfate NO3
- = nitrate
SO32- = sulfite NO2
- = nitrite
![Page 5: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/5.jpg)
Names for Cations and Anions
Monatomic Cation Names: Same as element name• Na+ sodium ion• Al3+ aluminum ion
![Page 6: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/6.jpg)
Names for Cations and Anions
What about transition metals with more than one charge? • Fe2+ iron(II)• Fe3+ iron(III)
![Page 7: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/7.jpg)
Names for Cations and Anions
What about transition metals with more than one charge?• Cu+ copper(I)• Cu2+ copper(II)
![Page 8: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/8.jpg)
Names for Cations and Anions
Monatomic Anion Names: Element name with –ide ending• S2- sulfide ion• O2- oxide ion
![Page 9: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/9.jpg)
Names for Cations and Anions
Monatomic Anion Names: Element name with –ide ending• P3- phosphide ion• N3- nitride ion
![Page 10: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/10.jpg)
Naming Binary Ionic Compounds
A binary compound is composed of two elements and can be ionic or molecular (covalent).• Binary ionic compound = metal, then
nonmetal
![Page 11: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/11.jpg)
Naming Binary Ionic Compounds
NaCl • sodium chlorideCa3P2 • calcium phosphide
CuCl2 • copper(II) chlorideNi3N2 • nickel(II) nitride
![Page 12: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/12.jpg)
Naming Compounds with Polyatomic Ions
To name an ionic compound with a polyatomic ion, write the name of the cation first, followed by the name of the anion.
![Page 13: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/13.jpg)
Naming Compounds with Polyatomic Ions
NaNO3 • sodium nitrate(NH4)2SO4 • ammonium sulfate
Ca(NO3)2 • calcium nitrate
![Page 14: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/14.jpg)
Writing Formulas for Ionic Compounds
The metal (cation) always goes first, followed by the nonmetal (anion).
![Page 15: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/15.jpg)
Writing Formulas for Ionic Compounds
Use the “criss-cross method” to balance out the charges.
![Page 16: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/16.jpg)
Writing Formulas for Ionic Compounds
Use the “criss-cross method” to balance out the charges.
Parenthesis must be used if more than one polyatomic ion is needed.
![Page 17: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/17.jpg)
Writing Formulas for Ionic Compounds
Use the “criss-cross method” to balance out the charges.
Always reduce the subscripts to lowest terms
![Page 18: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/18.jpg)
Naming Binary Molecular Compounds
We use prefixes to tell how many of each element are in a binary molecular compound.
![Page 19: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/19.jpg)
Naming Binary Molecular Compounds
Name the elements in the order listed in the compound, using prefixes to indicate the number of each element.• Never use the prefix mono- for the first
element• The second element always ends in -ide
![Page 20: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/20.jpg)
Naming Binary Molecular Compounds
CO• carbon monoxideCO2
• carbon dioxide
P4O10
• tetraphosphorus decoxide
N2O5
• dinitrogen pentoxide
![Page 21: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/21.jpg)
Writing Formulas forBinary Molecular Compounds
Write the formula in the same order the elements are named.
The prefix tells you the subscript for each element.
![Page 22: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/22.jpg)
Writing Formulas forBinary Molecular Compounds
Dioxygen monofluoride • O2F
Phosphorus trichloride• PCl3
![Page 23: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/23.jpg)
Review
Binary Ionic Compounds Binary Molecular Compounds
Electrons Give and Take Shared
Type of Elements Metal + Nonmetal Nonmetal + Nonmetal
Naming NO prefixes YES prefixes
YES Roman numerals (if > 1 charge) NO Roman numerals
![Page 24: Unit 6B: Naming and Writing Formulas for Ionic and Covalent Compounds](https://reader035.vdocument.in/reader035/viewer/2022062805/5697c00f1a28abf838cca7e0/html5/thumbnails/24.jpg)
Review