Chem A Polyatomic Packet Name: ______Hour: ______Page 2

Chemistry A

Polyatomic Compounds

All videos are at http://mrscrane.wiki.farmington.k12.mi.us


Polyatomic Compounds Learning Goals

·  Worksheet #1 (Concept) I can identify compounds that contain polyatomic ions.

·  Worksheet #2 (Concept) I can name and write formulas for compounds that contain polyatomic ions

·  Worksheet #3 (Concept) I can name and write formulas for compounds containing a special metal and a polyatomic ion

·  Worksheet #4 (Concept) I can name and write formulas for all compounds containing polyatomic ions

·  Worksheet #5 and #7 (Concept) I can name and write formulas for ionic, covalent and polyatomic compounds.

·  Worksheets #6 (Concept) I can draw diagrams to represent polyatomic compounds.

·  Worksheets #7 (Concept) I can draw diagrams to represent a mixture of ionic, covalent and polyatomic compounds.


Chemistry Self Assessment Sheet

Directions: Record the learning goal and homework from the board each day at the start of class. Self evaluate yourself at the end of class using the scales on the learning goals sheet.


Worksheet #1: Introduction to Polyatomic Ions

So far we have only learned how to name compounds with two different elements. The first type of compound we named was an ionic compound. Ionic compounds are made of a metal and a nonmetal. The second type of compound we named was a covalent compound. Covalent compounds are made of two nonmetals.

In this packet we will learn how to name compounds with more than two elements. In all the examples we will look at, these compounds will contain a polyatomic ion. A polyatomic ion is a group of atoms that has a charge (by the loss or gain of electrons). It sticks together as a single unit in chemical reactions.

The following table contains the common polyatomic ions we will use. You do not need to memorize these, but you will need to be able to use them to write formulas and name compounds.

Cation with +1 charge / Anions with -1 charge / Anions with -2 charge / Anions with -3 charge
Formula Name / Formula Name / Formula Name / Formula Name
NH4+1 ammonium / C2H3O2-1 acetate / CO3-2 carbonate / AsO4-3 arsenate
OH-1 hydroxide / SO4-2 sulfate / BO3-3 borate
ClO4-1 perchlorate / SO3-2 sulfite / PO3-3 phosphite
ClO3-1 chlorate / S2O3-2 thiosulfate / PO4-3 phosphate
ClO2-1 chlorite / SiO3-2 silicate
ClO-1 hypochlorite / O2-2 peroxide
NO3-1 nitrate / CrO4-2 chromate
NO2-1 nitrite / Cr2O7-2 dichromate
BrO3-1 bromate / HPO4-2 biphosphate
IO3-1 iodate / or hydrogen phosphate
CN-1 cyanide / C2O4-2 oxalate
SCN-1 thiocyanate
MnO4-1 permanganate
HCO3-1 bicarbonate or hydrogen carbonate
HSO4-1 bisulfate
or hydrogen sulfate
H2PO4-1 dihydrogen phosphate

Notice that with the exception of ammonium (NH4+1), all the other polyatomic ions have a negative charge. Because of this, they usually take the place of the nonmetal in the compound and bond with a metal. For example:

calcium carbonate Ca+2 and CO3-2 = CaCO3

When writing formulas you treat polyatomic ions as just like single atoms. If you need more than one of the polyatomic ions, you put it in parenthesis and use a subscript. For example:

calcium nitrate Ca+2 and NO3-1 = Ca(NO3)2

ammonium sulfate NH4+1 and SO4-2 = (NH4)2SO4


Worksheet # 2: Naming Polyatomic Ions

When naming polyatomic compounds you just need to name each ion. You can use the chart to help you. For example:

Ba(C2H3O2)2 = barium acetate

Al(ClO3)3 = aluminum chlorate

Write the names of the following compounds.

Formula / Name / Formula / Name
CaCO3 / calcium carbonate / Cs2SiO3 / cesium silicate
Ni(ClO2)2 / RbC2H3O2
KHCO3 / Be(BrO3)2
CdSO4 / Na3BO3
Al(H2PO4)3 / BaO2
NaClO / KMnO4
FrOH / Ag2SiO3

Write the formulas for the following compounds. The oxidation #’s for the polyatomic ions are on the chart.

Name / Symbol
w/ ox # / Formula
(Swap & Drop) / Name / Symbol
w/ ox # / Formula
(Swap & Drop)
magnesium hydroxide / Mg(OH)2 / silver carbonate / Ag2(CO3)
aluminum nitrate / ammonium phosphate
lithium sulfate / barium hydroxide
sodium bicarbonate / zinc nitrite
calcium phosphite / potassium dichromate
zinc acetate / aluminum silicate
lithium peroxide / beryllium perchlorate

Write the correct name for the following compounds and then tell the number of atoms present in each of the following formulas.

Formula / Name / # of atoms
NaHSO4 / sodium bisulfate / 7
(NH4)2CO3
Ba(C2H3O2)2
Mg3(PO4)2

Worksheet # 3: Naming Polyatomic Ions with Special Metals

Formula / Calculation / Name
Hg(NO3)2 / mercury (II) nitrate
Sb(ClO4)5
Pb(C2H3O2)2
CuClO2
Bi2(SiO3)5
Sn(HPO4)2
FeCO3
Cu(CN)2
Sb2(SO4)3
Pb(NO2)2
Sn(OH)2
Hg(ClO3)
Fe2(S2O3)3
BiPO3

The following compounds contain one of the seven metals, which have more than one oxidation number.

They are iron, copper, mercury, tin, lead, antimony and bismuth.

If you are to name compounds using roman numerals you will need to calculate the oxidation number of the compound. For example:

SnCO3 à +2 Sn (CO3)-2 X1 = -2

\ you have tin(II) carbonate

Fe(SCN)3 à +3 Fe (SCN)3-1 X 3 = -3

\ you have iron(III) thiocyanate

Write the formulas for the following compounds.

Name / Symbol
w/ ox # / Formula
lead(II) nitrate / Pb(NO3)2
copper(II) carbonate
iron (III) hydroxide
antimony(III) acetate
lead (IV) cyanide
copper (I) chlorite
bismuth (III) bisulfate
tin(IV) phosphate
mercury (I) silicate
tin (II) iodate
iron(II) thiosulfate
antimony(V)oxalate
mercury(II) sulfate


Worksheet # 4: Review of Naming Polyatomic Ions

This worksheet is a combination of worksheet # 2 and # 3. You will need to decide when to use roman numerals.

Name the following compounds. Use the roman numerals when appropriate.

Formula / Name / Formula / Name
CaC2O4 / Mg3(AsO4)2
LiBrO3 / Fr2SiO3
Na2O2 / SbPO4
KSCN / SnSO4
(NH4)3BO3 / Pb(C2H3O2)2
Be(ClO2)2 / Sb(NO2)5
NH4OH / Bi2(SiO3)3

Write the formula for the following compounds.

Name / Symbol
w/ ox # / Formula / Name / Symbol
w/ ox # / Formula
potassium cyanide / rubidium hypochlorite
ammonium hydroxide / copper (I) nitrate
lithium arsenate / lead(II) chromate
magnesium oxalate / mercury (II) chlorate
sodium borate / iron(III) thiocyanate
calcium oxalate / antimony (III) bromate
barium sulfate / copper(II) carbonate

Write the correct name for the following compounds and then tell the number of atoms present in each of the following formulas.

Formula / Name / # of atoms
(NH4)3PO4
Al(ClO4)3
K3AsO4
Fe2(SO4)3
Sb(OH)5

Worksheet # 5: Review of Regular Compounds AND Polyatomic Compounds (All Types of Compounds)

Give the name for the following ionic compounds containing metals and nonmetals. Use roman numerals when appropriate.

Formula / Name / Formula / Name
NaCl / AlN
K2S / PbO
Sr3P2 / BiF5

Give the formula for the following compounds containing metals and nonmetals.

Name / Symbol
w/ ox # / Formula / Name / Symbol
w/ ox # / Formula
aluminum oxide / cesium phosphide
barium bromide / antimony(III) sulfide
rubidium telluride / copper (I) chloride

Name the following covalent compounds containing all nonmetals. Remember to use prefixes.

Formula / Name / Formula / Name
P4O10 / Cl2O7
PF3 / BI3
N2O / SO2

Write the formula for the following compounds.

Name / Formula / Name / Formula
carbon monoxide / sulfur hexafluoride
sulfur trioxide / silicon tetrachloride
diphosphorus trioxide / nitrogen monoxide

Name the following compounds. This is a mixture of all of the types of compounds you have learned so far.

Formula / Name / Formula / Name
Li3N / NH4OH
NiF2 / MgSO4
SiO2 / Al2(CO3)3
PCl3 / Zn(C2H3O2)2

Write the formula for the following compounds. This is a mixture of all of the types of compounds you have learned so far.

Name / Symbol
w/ ox #
(Optional) / Formula / Name / Symbol
w/ ox #
(Optional) / Formula
iron(II) selenide / ammonium thiocyanate
mercury (I) biphosphate / sodium cyanide
nitrogen trichloride / XXXXX / beryllium silicate
tetraphosphorus hexasulfide / XXXXX / silver nitrate

Worksheet #6: Covalent Bonding in Polyatomic Ions

Now you are going to draw electron dot diagrams for the following polyatomic ions. Remember that even though they are ions the atoms are held together inside the ion with covalent bonds. Negative ions have gained electrons, you must include these in the structure. Positive ions have lost electrons, you must delete these from the structure.

Ex: ammonium ion [NH4]+1 Final Answer

Ex: bromate ion [BrO3]-1

  1. hydroxide ion [OH]-1

2. phosphite ion [PO3]-3

3. perchlorate ion [ClO4]-1


Worksheet #7: Polyatomic Compound Review Sheet

Write the name, symbol, and oxidation numbers for the seven elements, which require the use of roman numerals.

Write the first 10 prefixes.

Multiple Oxidation Number Metal / Symbol / Lower Oxidation # / Higher Oxidation #
Mercury
Copper
Iron
Tin
Lead
Bismuth
Antimony
1= mono / 6 =
2= / 7 =
3 = / 8 =
4 = / 9 =
5 = / 10 =

Write the name for the following compounds. Use roman numerals for compounds containing the multiple oxidation number metals. Use prefixes for compounds containing all nonmetals.

Formula / Name / Formula / Name
AlCl3 / (NH4)2SO4
PtO / CsNO3
Hg2S / BaHPO4
NO3 / PbC2O4
P2O4 / Fe(BrO3)3

Write the formula for the following compounds.

Name / Symbol
w/ ox #
(Optional) / Formula / Name / Symbol
w/ ox #
(Optional) / Formula
strontium nitride / dinitrogen monoxide / XXXXXX
bismuth (III) fluoride / sulfur hexafluoride / XXXXXX
antimony (V) chlorate / sodium hypochlorite
carbon dioxide / XXXXXX / ammonium cyanide
dinitrogen tetraoxide / XXXXXX / beryllium hydroxide


Worksheet #7 Continued

Draw diagrams for the following compounds.

a) hydroxide ion [OH]-1 b) methane (CH4)

c) iron (II) oxide (FeO) d) sulfite ion [SO2]-2

e) ammonium ion [NH4]+1 f) sulfate ion [SO4]-2

g) carbon tetrachloride (CCl4) h) sodium nitride (Na3N)