WorksheetsBalancing Equations
Total questions: 85
Worksheet time: 2hrs 1mins
Name
Class
Date
1.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
2.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
3.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
4.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
5.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
6.
Balance this equation
_N2 + _H2 --> _NH3
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
7.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
8.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
9.
Balance this equation-
_SeCl6+_O2>_SeO2+_Cl2
_SeCl6+_O2>_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
10.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
11.
Balance this equation.
_N2+_O2->_H2O+_HNO3
_N2+_O2->_H2O+_HNO3
a)
not possible
b)
2,2,1,2
c)
2,1,1,4
d)
2,2,1,4
12.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
13.
What is the little number after an element in a chemical equation called.
Example: H2
Example: H2
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
14.
What is the arrow in a chemical equation...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
15.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
16.
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.
17.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
18.
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
19.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
20.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
21.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
22.
A replacement occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
23.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
24.
A synthesis occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
25.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
26.
How would this equation be classified?
O2 + 2H2 --> 2H2O
O2 + 2H2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Combustion
d)
Single Displacement
27.
Balance this equation:
FeS + 2HCl -->
FeCl2 + H2O
FeS + 2HCl -->
FeCl2 + H2O
a)
FeS2 + 2HCl --> FeCl2 + H2O
b)
It's already balanced
c)
FeS2 + 2HCl --> FeCl2 + H4O
d)
None of these
28.
Mg + HCl ---> MgCl2 + H2
How many HCl molecules do you need to balance this equation?
How many HCl molecules do you need to balance this equation?
a)
1
b)
2
c)
3
d)
4
29.
Na + O2 -----> Na2O
What is the coefficient for O2 in the properly balanced equations?
What is the coefficient for O2 in the properly balanced equations?
a)
1
b)
2
c)
3
d)
4
30.
5g of reactant A is used in the reaction A + B --> C. 9g of C is produced. How many grams of reactant B were required to run this reaction to completion? In a reaction?
a)
4g
b)
5g
c)
9g
d)
14g
31.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
32.
A vertical column is called...
a)
group
b)
tower
c)
period
d)
crew
33.
The horizontal row on the periodic table is called a
a)
group
b)
family
c)
period
d)
atomic number
34.
How many oxygen atoms appear on the left hand side of the equation?
a)
1
b)
2
c)
0
d)
3
35.
How many hydrogen atoms appear on the left hand side of the equation
a)
3
b)
4
c)
5
d)
12
36.
When the equation is balanced which number should appear in front of the sodium oxide (Na2O)?
a)
1
b)
2
c)
3
d)
4
37.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
38.
Is this balanced?...
Fe + S --> FeS
Fe + S --> FeS
a)
YES!
b)
NO!
39.
Name this reaction, Cl2 + 2KI --> I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
40.
What are Chemical Reactions?
a)
It's when you mix substances.
b)
a process in which atoms rearrange to form new substances
c)
When something bubbles.
d)
letter and numbers showing the types and number of atoms
41.
A compound is reacted and forms two new substances. What type of reaction is this?
AB --> A + B
AB --> A + B
a)
combustion
b)
synthesis
c)
decomposition
d)
single replacement
42.
An element plus additional element reacts to form one product is an example of which type of chemical reaction?
A + B --> AB
A + B --> AB
a)
combustion
b)
decomposition
c)
synthesis
d)
single replacement
43.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
44.
A _________ chemical equation has the same number of atoms of each element on both sides of the equation.
a)
simple
b)
balanced
c)
unbalanced
d)
complex
45.
Reaction, compounds are broken down-into simpler products
a)
synthesis
b)
decomposition
c)
replacement
46.
reaction, once element replaces another element in a compound
a)
synthesis
b)
decomposition
c)
replacement
47.
reaction, two or more elements or compounds combine and make a new, more complex, product
a)
synthesis
b)
decomposition
c)
replacement
48.
What type of reaction is the following equation?
___K2SO4 + ___BaCl2 ------> ___KCl + ___BaSO4
a)
synthesis
b)
decomposition
c)
Single replacement
d)
Double replacement
49.
What type of reaction is the following equation?
____V2O5 + ___Ca -------> ___CaO + ___V
a)
synthesis
b)
single replacement
c)
double replacement
d)
1,2,2,2
50.
What type of reaction is the following equation?
___Ca(OH)2 + ___NH4Cl -------> ____NH4OH + ___CaCl2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
51.
What type of reaction is the following equation?
___Fe + ___O2 -------> ___Fe2O3
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
52.
What type of reaction is this equation?
___Al + ___HCl -------> ___AlCl3 + ___H2
a)
decomposition
b)
double replacement
c)
single replacement
d)
synthesis
53.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO3
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
54.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
55.
What is the left part of a chemical equation called...
H2 + O --> H2O
H2 + O --> H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
56.
____ Na3PO4 + ____ KOH --->____ NaOH + ____ K3PO4
a)
1,2,1,2
b)
1,3,3,1
c)
1,1,1,1
d)
2,6,6,2
57.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
58.
This is used to represent the number of each atom being represented.
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
59.
How many oxygen atoms are in this chemical formula?
a)
7 oxygen atoms
b)
4 oxygen atoms
c)
3 oxygen atoms
d)
1 oxygen atoms
60.
Which of the following are PRODUCTS?
H2O + CO2 → HCO + HO
H2O + CO2 → HCO + HO
a)
H2O and CO2
b)
HCO and HO
c)
H2O ONLY
d)
HCO ONLY
61.
What does the COEFFICIENT represent?
a)
The number of individual atoms
b)
The number of molecules
c)
The charge of the atom
d)
The type of molecule
62.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
63.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
64.
Balance this equation.
_N2+_O2->_H2O+_HNO3
_N2+_O2->_H2O+_HNO3
a)
not possible
b)
2,2,1,2
c)
2,1,1,4
d)
2,2,1,4
65.
What type of Reaction?
H2CO3 --> H2O + CO2
H2CO3 --> H2O + CO2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Combustion
66.
What type of Reaction?
2 AgNO3 + Ni --> Ni(NO3)2 + 2 Ag
2 AgNO3 + Ni --> Ni(NO3)2 + 2 Ag
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Combustion
67.
8 Cu + S8 --> 8 CuS
a)
Synthesis
b)
decomposition
c)
single replacement
d)
double replacement
68.
What type of Reaction?
3AgNO3 + K3PO4 --> Ag3PO4 +
3 KNO3
3AgNO3 + K3PO4 --> Ag3PO4 +
3 KNO3
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
69.
Balance the equation
__ CaBr2 + __KOH→ __Ca(OH)2 + __KBr
__ CaBr2 + __KOH→ __Ca(OH)2 + __KBr
a)
2, 2, 1, 1
b)
1, 2, 1, 2
c)
2, 1, 2, 1
d)
1, 2, 1, 1
70.
When balancing chemical equations, do you ever change the subscripts?
a)
Yes
b)
No
71.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
72.
Na + MgF2 ⋙ NaF + Mg
a)
2 Na + MgF2 ⋙ 2 NaF + Mg
b)
3 Na + MgF2 ⋙ 2 NaF + Mg
c)
2 Na + MgF2 ⋙ 2 NaF2 + Mg
d)
2 Na + MgF2 ⋙ 2 NaF + 2Mg
73.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
74.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
75.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
76.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
77.
Mn + _ HNO3 → Mn(NO3)2 + H2
Which kind of reaction is this?
Which kind of reaction is this?
a)
synthesis
b)
decomposition
c)
single displacement
d)
double displacement
78.
FeS + HCl ---> FeCl2 + H2S
Which kind of reaction is this?
Which kind of reaction is this?
a)
synthesis
b)
decomposition
c)
single displacement
d)
double displacement
79.
H2CO3 → H2O + CO2
Which kind of reaction is this?
Which kind of reaction is this?
a)
synthesis
b)
decomposition
c)
single displacement
d)
double displacement
80.
What is the name of this classic character from the Fairly Odd Parents TV show?
a)
Cosmo
b)
Crash Nebula
c)
Jorgen Von Strangle
d)
The Crimson Chin
81.
Is the following equation balanced or unbalanced ?
Al + O2 --> Al2O3
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
82.
Is the following equation balanced or unbalanced ?
N2 +3 H2 --> 2NH3
N2 +3 H2 --> 2NH3
a)
Balanced
b)
Unbalanced
83.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
84.
Read the following chemical formula: C6H12O6. How many hydrogen atoms are in the formula?
a)
12
b)
6
c)
4
85.
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
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