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Balancing Chemical Equations Review

Total questions: 63

Worksheet time: 1hrs 2mins

Name
Class
Date
1.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
Left side is balanced
2.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
3.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
4.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
5.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
6.
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
7.
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
8.
N2 + H2 = NH4
a)
Balanced
b)
Unbalanced
9.
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. 
10.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
11.
Name the part in red:

_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
12.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
13.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
14.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
15.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
16.

What is the arrow in a chemical equation...

H2 + O2 --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

17.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
18.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
19.
Balance this equation:
FeS + 2HCl -->
FeCl2 + H2O
a)
FeS2 + 2HCl --> FeCl2 + H2O
b)
It's already balanced
c)
FeS2 + 2HCl --> FeCl2 + H4O
d)
None of these
20.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
21.
Which side of a chemical equation is the reactant side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
22.
Which side of a chemical equation os the product side?
a)
Left (before the yields sign)
b)
Right (after the yields sign)
23.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
24.
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. 
25.
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
26.

The two sides of a chemical equation are called?

a)

Reactants (left) and Products (right)

b)

Ingredients (left) and Product (right)

c)

Cations and Anions

d)

Reactants (left) and Results (right)

27.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
28.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
29.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
30.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
31.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
32.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

33.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

34.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

35.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

36.

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

37.

In a chemical reaction, everything to the RIGHT of the arrow is called ______________.

a)

Product(s)

b)

Yields

c)

Molecules

d)

Reactant(s)

38.
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
39.

What type of reaction is the following: 2KI → 2K + I22KI\ \rightarrow\ 2K\ +\ I_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

40.
Which of the following is an example of a chemical change?
a)
melting a stick of butter
b)
dissolving salt in water
c)
using magnesium to displace hydrogen gas from water
41.
Which of the following is an example of a physical change to matter?
a)
rusting
b)
digestion
c)
freezing
42.

In a chemical reaction, everything to the LEFT of the arrow is called ______________.

a)

Product(s)

b)

Yields

c)

Molecules

d)

Reactant(s)

43.

According to _______, matter is neither destroyed nor created during a chemical reaction.  This is why we have to balance equations.

a)

the Law of Conservation of Mass

b)

Newton’s Law

c)

the Law of Chemical Reactions

d)

the Law of Conservation of Energy

44.

In a chemical reaction, (aq) written after a compound means that:

a)

the compound is flammable.

b)

the compound is dissolved in water.

c)

the compound will melt.

d)

the compound is unstable.

45.

Changing the subscript in a chemical formula changes _______.

a)

nothing

b)

the identify of the substance so that it becomes a different compound

c)

the electrical charge on the atoms of that substance

d)

the amount of that substance

46.

A solid compound that forms and settles out of a solution during a double displacement reaction is called _______.

a)

a solid

b)

a catalyst

c)

a precipitate

d)

a reactant

47.

Two or more reactants form only one complex product.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

48.

A + B ⇒ AB

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

49.

A more complex compound breaks down into its more simpler parts.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

50.

AB ⇒ A + B

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

51.

An uncombined element replaces another element in a compound.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

52.

AB + C ⇒ AC + B

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

53.

When two compounds yield two products but they swap or replace partners.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

54.

AB + CD ⇒ AD + CB

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

55.

A chemical reaction in which a substance combines with oxygen and releases energy.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

56.

C₆H₁₂ + 9 O₂ ⇒ 6 CO₂ + 6 H₂O

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

57.

The products of this reaction are almost always water and carbon dioxide.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

e)

combustion

58.

Which of the following is an example of a synthesis reaction?

a)

Cl2 + 2NaBr ⟶ 2NaCl + Br2

b)

MgO + CO2 ⟶ MgCO3

c)

FeBr3 + K3PO4 ⟶ FePO4 + 3KBr

d)

2Na2O2 ⟶ 2Na2O + O2

59.

Which of the following is an example of a decomposition reaction?

a)

Cl2 + 2NaBr ⟶ 2NaCl + Br2

b)

MgO + CO2 ⟶ MgCO3

c)

FeBr3 + K3PO4 ⟶ FePO4 + 3KBr

d)

2Na2O2 ⟶ 2Na2O + O2

60.

Which of the following is an example of a single replacement reaction?

a)

Cl2 + 2NaBr ⟶ 2NaCl + Br2

b)

MgO + CO2 ⟶ MgCO3

c)

FeBr3 + K3PO4 ⟶ FePO4 + 3KBr

d)

2Na2O2 ⟶ 2Na2O + O2

61.

Which of the following is an example of a double replacement reaction?

a)

Cl2 + 2NaBr ⟶ 2NaCl + Br2

b)

MgO + CO2 ⟶ MgCO3

c)

FeBr3 + K3PO4 ⟶ FePO4 + 3KBr

d)

2Na2O2 ⟶ 2Na2O + O2

62.

Which of the following is NOT a combustion reaction?

a)

CH₄ + 2O₂

→

CO₂ + 2H₂O

b)

C₃H₈ + 5O₂

→

3CO₂ + 4H₂O

c)

FeBr3 + K3PO4

⟶

FePO4 + 3KBr

d)

C₂H₅OH + 3O₂

→

2CO₂ + 3H₂O

63.

A scientist is studying a chemical reaction in which potassium sulfide (K2S) decomposes into potassium and sulfide.

a)

K2S ----> K + S

b)

K + S ---->K2S

c)

K2S + S ----> K

d)

K + K2S ----> S

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