WorksheetsBalancing Equations
Total questions: 45
Worksheet time: 2hrs 45mins
Name
Class
Date
1.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
2.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
3.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
4.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
5.
How many hydrogen atoms are reacting?
a)
2
b)
4
c)
8
d)
1
6.
How many oxygen atoms are produced?
a)
2
b)
4
c)
8
d)
1
7.
How many oxygen molecules are produced?
a)
2
b)
4
c)
8
d)
1
8.
How many water molecules are produced?
a)
2
b)
4
c)
8
d)
1
9.
How many H2O2 molecules are reacting?
a)
2
b)
4
c)
8
d)
1
10.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
11.
Which problem is balanced?
a)
PbO2 + 2H2
b)
So2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
12.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
13.
What is a closed system?
a)
A system in which energy does not travel freely.
b)
A system in which energy travels freely.
14.
What is a reactant?
a)
The chemical substances that begin the reaction.
b)
What comes from the reaction.
15.
Is this equation balanced?: CS2 + 202 --> CO2 +2SO2
a)
Yes
b)
No
16.
What is a yield?
a)
The arrow in an equation that represents the chemical reaction.
b)
The beginning substances.
17.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
18.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
19.
A replacement occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
20.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
21.
What is an open system?
a)
A system in which energy does not travel freely.
b)
A system in which energy travels freely.
22.
What is a product?
a)
What's left of the chemical reaction.
b)
The beginning formulas.
23.
How many elements are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
24.
What coefficients are needed to correctly balance the equation?
_Bi + _O2 > _Bi2O3
_Bi + _O2 > _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
25.
How many atoms are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
26.
How many Al atoms are represented? 4Al2O3
a)
2
b)
8
c)
5
d)
20
27.
How many total atoms are represented? 4Al2O3
a)
2
b)
8
c)
5
d)
20
28.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
29.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
60
30.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
31.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
32.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
not true
c)
obeyed
d)
used sometime
33.
What is a chemical equation?
a)
A short way to show a chemical reaction using symbols
b)
A way to explain a chemical reaction using words
34.
How would this equation be classified?
2KClO3 -> 2KCl + 3O2
2KClO3 -> 2KCl + 3O2
a)
Synthesis
b)
Double Displacement
c)
Decomposition
d)
Combustion
35.
What reaction does this equation correspond with?
CxHy + O2 --> CO2 + H2O
CxHy + O2 --> CO2 + H2O
a)
Single Displacement
b)
Double Displacement
c)
Combustion
d)
Synthesis
36.
What reaction does this equation correspond with?
A + B --> AB
A + B --> AB
a)
Double Displacement
b)
Combustion
c)
Synthesis
d)
Decomposition
37.
Balance this equation:
MgCl2 --> Mg4+ Cl2
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
38.
What reaction does this equation correspond with?
AX + BY --> AY + BX
AX + BY --> AY + BX
a)
Combustion
b)
Synthesis
c)
Decomposition
d)
Double Displacement
39.
Identify the reaction: 3 AgNO3 + K3PO4 --> Ag3PO4 + 3 KNO3
a)
Synthesis reaction
b)
Single replacement reaction
c)
Double replacement reaction
40.
Identify the reaction:
4 Cr + 3 O2 --> 2Cr2O3
4 Cr + 3 O2 --> 2Cr2O3
a)
Synthesis reaction
b)
Decomposition reaction
c)
Single replacement reaction
41.
Identify the reaction:
2 NaClO3 --> 2 NaCl + 3 O2
2 NaClO3 --> 2 NaCl + 3 O2
a)
Synthesis reaction
b)
Decomposition reaction
c)
Combustion reaction
42.
Identify the reaction:
Cu(OH)2 + 2 HC2H3O2 -->
Cu(C2H3O2)2 + 2 H2O
Cu(OH)2 + 2 HC2H3O2 -->
Cu(C2H3O2)2 + 2 H2O
a)
Single replacement reaction
b)
Double replacement reaction
c)
Combustion reaction
43.
Identify the reaction: 2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O
a)
Combustion reaction
b)
Decomposition reaction
c)
Single replacement reaction
44.
Identify the reaction:
C3H8 + 5 O2 -->
3 CO2 + 4 H2O
C3H8 + 5 O2 -->
3 CO2 + 4 H2O
a)
Combustion reaction
b)
Decomposition reaction
c)
Synthesis reaction
45.
Identify the reaction:
8 Cu + S8 --> 8 CuS
8 Cu + S8 --> 8 CuS
a)
Synthesis reaction
b)
Decomposition reaction
c)
Combustion reaction
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