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CB Chem Period 2
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4. Monday, January 20, 2015
Homework: 2-4 Objective: We will write formulae and apply naming conventions to ionic compounds with polyatomic ions Catalyst: Complete the first table on the agenda you picked up on the way in.
Classroom expectations:
Wear Kenwood ID.
Cell phones, music players, and headphones are put away.
Food is disposed of or put away.
Dressed appropriately.
Notebook is out and you are ready for today’s class.
***Table of Contents
19 Notes: Ionic Compounds w/Polyatomic Ions

5. Announcements Tutoring this week: Wednesday, Thursday
Ionic Compounds QUEST THURSDAY!!!

6. 1 week left!!! 2nd: Tuesday 7th: Tuesday 8th: Wednesday
Semester Exams
1 week left!!! 2nd: Tuesday 7th: Tuesday 8th: Wednesday

7. Catalyst/Announcements Homework Check
Agenda
Catalyst/Announcements
Homework Check
Notes: Ionic Compounds with Polyatomic Ions

8. Polyatomic Ions Poly = many Atomic = made of atoms
A polyatomic ion is a group of atoms that has an overall ionic charge.
Some examples of polyatomic ions are
NH4+ ammonium OH− hydroxide
NO3− nitrate NO2− nitrite
CO32− carbonate PO43− phosphate
HCO3− hydrogen carbonate
(bicarbonate)

9. Some Compounds with Polyatomic Ions
Copyright © by Pearson Education, Inc.

10. Polyatomic Ions to Know
Name
Formula
Hydronium
H3O+
Sulfite
SO32-
Ammonium
NH4+
Nitrate
NO3-
Hydroxide
OH-
Nitrite
NO2-
Phosphate
PO43-
Chlorate
ClO3-
Peroxide
O22-
Chlorite
ClO2-
Carbonate
CO32-
Acetate
C2H3O2- or CH3COO-
Sulfate
SO42-

11. Some Names of Polyatomic Ions
The names of some polyatomic anions
end in ate.
Copy both examples!
NO3− nitrate PO43− phosphate
If the ion has one fewer oxygen, the name ends in ite.
NO2− nitrite PO33− phosphite

12. O S O Polyatomic Ions Why do polyatomic ions have an overall charge? O
The polyatomic ion is drawn with brackets to show the ion is ONE unit O
O S O 2-
The charge of the polyatomic unit is written outside the bracket
The charge is due to the ion having extra electrons
Sulfate has 2 extra electrons resulting in a charge of -2

13. Naming Compounds with Polyatomic Ions
The positive ion is named first, followed by the name of the polyatomic ion.
NaNO3 sodium nitrate
K2SO4 potassium sulfate
Fe(HCO3)3 iron(III) bicarbonate
or iron(III) hydrogen carbonate
(NH4)3PO3 ammonium phosphite

14. Guide for Naming Polyatomic Ions
Identify the cation and anion.
Name the cation or the polyatomic list.
Name the polyatomic ion WITHOUT changing the name.
Write the name of the compound the cation written first and the anion written last.

15. Example Problems Name the following compounds: Na2SO4 Mg(OH)2
Sodium Sulfate
Mg(OH)2
Magnesium Hydroxide

16. Whiteboard Practice Only write the problem given on your board.
You will lose privileges and points for not following instructions.

17. Whiteboard Practice Match each formula with the correct name.
A. MgS 1) magnesium sulfite
MgSO3 2) magnesium sulfate
MgSO4 3) magnesium sulfide
B. Ca(ClO3) ) calcium chlorate
CaCl2 2) calcium chlorite
Ca(ClO2) ) calcium chloride
Mg(NO2) ) Magnesium Oxide
MgO ) Magnesium Nitrite
Al2(SO4) ) Aluminum Sulfate

18. Solution Match each formula with the correct name.
A. MgS 3) magnesium sulfide
MgSO3 1) magnesium sulfite
MgSO4 2) magnesium sulfate
B. Ca(ClO3)2 1) calcium chlorate
CaCl2 3) calcium chloride
Ca(ClO2)2 2) calcium chlorite
Mg(NO2) ) Magnesium Nitrite
MgO ) Magnesium Oxide
Al2(SO4) ) Aluminum (II) Sulfate

19. Whiteboard Practice Name each of the following compounds: A. Mg(NO3)2
B. Al2(CO3)3
C. Na2O
D. Ga2(SO4)3
E. Ba3(PO4)2

20. Solution Name each of the following compounds:
A. Mg(NO3)2 magnesium nitrate
B. Al2(CO3)3 aluminum carbonate
C. Na2O sodium oxide
D. Ga2(SO4)3 gallium sulfate
E. Ba3(PO3)2 barium phosphite