GRADE 10: CHEMISTRY
TOPIC: MULTIVALENT METALS
AND POLYATOMIC IONS
Date: Thursday, March 21st, 2013
PUZZLERS
Courtesy of Mr. Luoma
ELEMENT OF THE DAY
ELEMENT OF THE DAY

What element do rat poison, laundry detergent,
and Silly-Putty all have in common?
ELEMENT OF THE DAY: BORON
Atomic Number: 5
 5 Proton, 5 Electron
 Atomic Weight: 10.811
 Location: Group 13
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Metalloid
Hard
Resistant to heat
ELEMENT OF THE DAY: BORON

Why is Boron cool to learn about?
Combined with Nitrogen, boron nitride crystals are
created, which are almost as hard as diamonds.
 Essential nutrient to all green plants
 Silly-Putty:

Soft and moldable in your hands
 Hard and bouncy when you throw it against the wall

ELEMENT OF THE DAY: BORON

Boric Acid flames:
Green flames are produced when you burn boron
 http://www.youtube.com/watch?v=BevctrjVPjA


Green Flames from Pinecones:

http://www.youtube.com/watch?feature=endscreen&v
=cXhX68qr5wY&NR=1
MULTIVALENT METALS
CLASS QUESTIONS

1. Write the formula for the compound formed by
each pair of elements.
a. gold(III) and nitrogen 
 b. copper(II) and sulfur 
 c. tin(II) and chlorine 
 d. lead(IV) and oxygen 


2. Write the names of the following binary ionic
compounds.
a. AuCl3 
 b. PbO2 
 c. Cu2O 
 d. AsCl3 

POLYATOMIC IONIC COMPOUNDS
CLASS QUESTIONS

1. Use the table of common polyatomic ions to
help you name and write formulas for these
compounds. Watch for multivalent ions, which
require identification by a Roman numeral. For
multivalent ions, write the name and formula for
each form of the ion.
a. Be and PO43– 
 b. Sn and ClO3– 
 c. Cu and NO3– 
 d. NH4+ and SO42– 

POLYATOMIC IONIC COMPOUNDS
CLASS QUESTIONS

2. Write the formula for each ion, and for the
compound formed by each combination of ions.
Use the list of common polyatomic ions to help
you.
a. calcium and carbonate 
 b. sodium and nitrite 
 c. calcium and sulfite 
 d. lead(II) and phosphate 

IONIC COMPOUNDS WORKSHEET

Complete the Ionic Compounds Worksheet
Binary Ionic Compounds
 Multivalent Metals
 Polyatomic Ionic Compounds

We will check the answers together in class
 Make note of which questions you were having
difficulty with
 ASK Questions if you are having difficulties!!
 A blank sheet with answers is posted on the
website:


http://lcsgrade10chemistry.weebly.com/
BINGO – BINARY IONIC COMPOUNDS
REVIEW (IF TIME)

See Binary Ionic Compounds Review Powerpoint
SUPPORTING DOCUMENTS

ON Science 10 Textbook

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Pages: 146-150
Chapter 4 Power Point for ON Science 10

Slides: 23-26

Chapter 4 Notebook - none

Websites: none
HOMEWORK

ON Science 10 Textbook

Page #: 150

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Page #151


Questions: 9, 10
Try Questions:1-8
Read - “Ionic Compounds
at Home”
HOMEWORK ANSWERS
Pg. 150

9.
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a. binary, Ni2O3
b. binary, CuI2
c. binary, Sn3N4
d. binary, CrBr2
e. binary, FeP
f. neither, LiHCO3
g. ternary, K2SO4
h. ternary, (NH4)3P
i. ternary, Ba(NO3)2
j. binary, Co3(PO4)2
HOMEWORK ANSWERS
Pg. 150
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10.
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a. gold(III) chloride
b. tin phosphide
c. chromium oxide
d. nitrogen sulphide
e. ammonium sulphide
f. calcium fluoride
g. iron(II) sulfite
h. magnesium phosphate
HOMEWORK ANSWERS

Pg. 151

1.
a. chloride
 b. magnesium
 c. sulfate
 d. copper(II)
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2.
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a. OH–
b. S2–
c. Al3+ d. Cr3+
3. The diagram should show two potassium atoms each
giving one electron to one sulfur atom, which has six
electrons in its outer shell.
HOMEWORK ANSWERS
Pg. 151


4. The tiles repeat in a regular pattern like the atoms in an
ionic compound. To represent sodium chloride, there would
have to be an equal ratio of black and white tiles.
5.
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
a. lithium carbonate
b. ammonium nitrite
c. copper(II) oxide
6.
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a. Mg3N2
b. Al(OH)3
c. SnBr2
d. NiSO4
HOMEWORK ANSWERS
Pg. 151

7.
a. Phosphorus was used instead of the phosphate ion.
Na3PO4
 b. The brackets around the nitrate ion were omitted.
Ca(NO3)2
 c. The two potassium ions are needed to make the
total charge zero. K2SO3


8. Fe2+ or Fe3+
MULTIVALENT METALS
CLASS QUESTIONS & ANSWERS

1. Write the formula for the compound formed by
each pair of elements.
a. gold(III) and nitrogen  AuN
 b. copper(II) and sulfur  CuS
 c. tin(II) and chlorine  SnCl2
 d. lead(IV) and oxygen  PbO2


2. Write the names of the following binary ionic
compounds.
a. AuCl3  gold(III) chloride
 b. PbO2  lead(IV) oxide
 c. Cu2O  copper(I) oxide
 d. AsCl3  arsenic(III) chloride

POLYATOMIC IONIC COMPOUNDS
CLASS QUESTIONS & ANSWERS

1. Use the table of common polyatomic ions to
help you name and write formulas for these
compounds. Watch for multivalent ions, which
require identification by a Roman numeral. For
multivalent ions, write the name and formula for
each form of the ion.
a. Be and PO43–  beryllium phosphate Be3(PO4)2
 b. Sn and ClO3–  i) tin(II) chlorate Sn(ClO3)2 ii)
tin(IV) chlorate Sn(ClO3)4
 c. Cu and NO3– i) copper(I) nitrate CuNO3 ii)
copper(II) nitrate Cu(NO3)2
 d. NH4+ and SO42–  ammonium sulfate (NH4)2SO4

POLYATOMIC IONIC COMPOUNDS
CLASS QUESTIONS & ANSWERS

2. Write the formula for each ion, and for the
compound formed by each combination of ions.
Use the list of common polyatomic ions to help
you.
a. calcium and carbonate  Ca2+ CO32-  CaCO3
 b. sodium and nitrite  Na+ NO2-  NaNO2
 c. calcium and sulfite Ca2+ SO32- CaSO3
 d. lead(II) and phosphate  Pb2+ PO43-  Pb3(PO4)2
