Dr. Taylor Balancing Reactions and Precipitation Homework
Word Equations
Write the word equations below as chemical equations and balance:
Chem 111 Spring 2012
1)
2)
Zinc and lead (II) nitrate react to form zinc nitrate and lead.
___________________________________________________________
Aluminum bromide and chlorine gas react to form aluminum chloride and bromine gas.
_______________________________________________________________
3) Sodium phosphate and calcium chloride react to form calcium phosphate and sodium chloride.
_______________________________________________________________
4) Potassium metal and chlorine gas combine to form potassium chloride.
_______________________________________________________________
5) Aluminum and hydrochloric acid react to form aluminum chloride and hydrogen gas.
_______________________________________________________________
6) Calcium hydroxide and phosphoric acid react to form calcium phosphate and water.
_______________________________________________________________
7) Copper and sulfuric acid react to form copper (II) sulfate and water and sulfur dioxide.
_______________________________________________________________
8) Hydrogen gas and nitrogen monoxide react to form water and nitrogen gas.
Section 2: Practicing equation balancing
Before you can write a balanced equation for a problem which asks you to predict the products of a reaction, you need to know how to balance an equation. Because some of you may not fully remember how to balance an equation, here are some practice problems:
H
6
+ __ O
2
 __ H
2
O + __ CO
2
2) __ NaI + __ Pb(SO
4
)
2
 __ PbI
4
+ __ Na
2
SO
4
3) __ + __ O
2
 __ NO + __ H
2
O
Fe(OH)
3
 __ Fe
2
O
3
+ __ H
2
O
HNO
3
+ __ Mg(OH)
2
 __H
2
O + __ Mg(NO
3
)
2
PO
4
+ __ NaBr  __ HBr + __ Na
3
PO
4
7) __ C + __ H
2
 __ C
3
H
8
8) __ CaO + __ MnI
4
 __ MnO
2
+ __ CaI
2
O
3
+ __ H
2
O  __ Fe(OH)
3
H
2
+ __ H
2
 __ C
2
H
6

1)
2)
3)
4)
5)
4)
5)
VF
5
+ __ HI  __ V
2
I
10
+ __ HF
OsO
4
+ __ PtCl
4
 __ PtO
2
+ __ OsCl
8
CF
4
+ __ Br
2
 __ CBr
4
+ __ F
2
Hg
2
I
2
+ __ O
2
 __ Hg
2
O + __ I
2
Y(NO
3
)
2
+ __ GaPO
4
 __ YPO
4
+ __ Ga(NO
3
)
2
Writing Complete Equations Practice
For each of the following problems, write complete chemical equations to describe the chemical process taking place. Important note: There are a few physical processes on this sheet – remember, you can’t write an equation for a physical process!
1) When lithium hydroxide pellets are added to a solution of sulfuric acid, lithium sulfate and water are formed.
2) When dirty water is boiled for purification purposes, the temperature is brought up to 100 minutes.
0
C for 15
3) If a copper coil is placed into a solution of silver nitrate, silver crystals form on the surface of the copper.
Additionally, highly soluble copper (I) nitrate is generated.
When crystalline C
6
H
12
O
6
is burned in oxygen, carbon dioxide and water vapor are formed.
When a chunk of palladium metal is ground into a very fine powder and heated to drive off any atmospheric moisture, the resulting powder is an excellent catalyst for chemical reactions.
Word Equations – Answer Key
1)
2)
Zn + Pb(NO
2 AlBr
3
3
)
+ 3 Cl
2
 Zn(NO
3
)
2
+ Pb
2
 2 AlCl
+ 3 CaCl
2
3
+ 3 Br
2
 6 NaCl + Ca
3
(PO
4
)
2
3)
4)
5)
6)
7)
2 Na
3
PO
4
2 K + Cl
2
3 Ca(OH)
Cu + 2 H
2
 2 KCl
2 Al + 6 HCl
2
+ 2 H
SO

4
3 H
2
+ 2 AlCl
3
3
PO
4
 Ca
 CuSO
4
3
(PO
+ 2 H
8) .
2 H
2
+ 2 NO  2 H
2
O + N
2
2
4
)
2
+ 6 H
2
O
O + SO
2
Section 2: Practicing equation balancing
1) 2 C
6
H
6
+ 15 O
2
 6 H
2
O + 12
2) 4 NaI + 1 Pb(SO
4
)
2

1 PbI
4
CO
2
+ 2 Na
2
SO
4
3) 2 NH
3
+ 2
4) 2 Fe(OH)
3
O
2

 1 NO + 3 H
1 Fe
2
O
3
+ 3 H
5) 2 HNO
3
+ 1 Mg(OH)
2

2 H
6) 1 H
3
PO
4
+ 3 NaBr

3 HBr + 1 Na
7) 3 C + 4 H
2

1 C
3
H
8
8) 2 CaO + 1 MnI
4

1 MnO
2
2
2
O
2
O
O + 1 Mg(NO
3
)
2
3
+ 2 CaI
2
9) 1 Fe
2
O
3
+ 3 H
2
O

2 Fe(OH)
3
10) 1 C
2
H
2
+ 2 H
2
 1 C
2
H
6
PO
4
Writing Complete Equations Practice - Key
2 LiOH
(s)
+ H
2
SO
4(aq)
 Li
2
SO
4(aq)
+ 2 H
2
O
(l)
No equation is needed, as boiling is a physical process.
Cu
(s)
+ AgNO
3(aq)
C
6
H
12
O
6(s)
+ 6 O
 Ag
(s)
+ CuNO
3(aq)
2(g)
 6 CO
2(g)
+ 6 H
2
O
(g)
Both grinding and heating are physical processes. Even if the atmospheric moisture is mentioned, boiling is still a physical process. No equation is needed.