wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Balancing Chemical Equations REVIEW

Total questions: 102

Worksheet time: 2hrs 44mins

Name
Class
Date
1.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
How many Oxygen are in H2O?
a)
1
b)
2
c)
0
d)
4
3.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
4.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
5.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
6.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
7.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
8.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
9.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
10.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
11.

A subscript is the small number below the element symbol that tells the number of _______ of that element.

a)

atoms

b)

valence electrons

c)

protons

d)

elements

12.

How many Nitrogen atoms are in the in H2C3O4N5?

a)

2

b)

3

c)

4

d)

5

13.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
14.

How many Aluminum atoms are in Al2O3?

a)

3

b)

2

c)

5

d)

1

15.

How many atoms are present if there is no subscript following the element symbol?

a)

0

b)

2

c)

only 1

d)

1 million

16.
How many atoms of Oxygen are in Fe(NO3)3 ?
a)
6
b)
3
c)
9
d)
1
17.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

18.

The ______ are numbers found on the lower right-hand side of an element symbol.

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

19.

Coefficients in chemical formulas...

a)

Multiply just the first atom

b)

Add to the subscripts at the end of the molecule

c)

Multiply elements without subscripts

d)

Multiply EVERYTHING!

20.

4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

21.

C3H5(NO3)3

a)

C = 3, H = 5, N = 3, O = 9

b)

C = 3, H = 5, N = 1, O = 9

c)

C = 9, H = 15, N = 3, O = 9

d)

C = 9, H = 15, N = 1, O = 3

22.

H2SO4

a)

H = 2, S = 4, O = 4

b)

H = 2, S = 1, O = 4

c)

H = 8, S = 4, O = 4

d)

H = 2, SO = 4

23.

A ______ is a number written in front of a chemical formula.

a)

Coefficient

b)

Subscript

c)

Exponent

d)

Coordinator

24.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
25.
The number of Na's in Na₂CO₃
a)
1
b)
2
c)
3
d)
6
26.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
27.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
28.
How many Chlorine are in MgCl2?
a)
2
b)
1
c)
3
29.
How many Nitrogen are in 2AlN?
a)
4
b)
5
c)
1
d)
2
30.

How many CARBONs are in this formula?

a)

1

b)

4

c)

8

d)

12

31.

How many total POTASSIUM atoms are in this formula?

a)

8

b)

2

c)

4

d)

12

32.

Which formulas have the same number of HYDROGENs?

a)
b)
c)
d)
33.

Which formulas have the most number of HYDROGENs?

a)
b)
c)
d)
34.

How many CARBON are in this formula?

a)

5

b)

2

c)

10

d)

20

35.

How many different elements are in this formula?

a)

5

b)

4

c)

20

d)

10

36.

What elements are represented in this chemical formula? Fe2O3Fe_2O_3  

a)

Iron, Oxygen

b)

Francium, Europium, Oxygen

c)

Ferrium, Oxygen

d)

Berylium, Oxygen

37.

What is the total number of atoms in this formula? H2O2H_2O_2  

a)

2

b)

4

c)

3

38.

What are the missing coefficients?

2 Li + ​ (a)   Cl2 → ​ (b)   LiCl

Choose from the below words
1
2
3
4
5
6
7
8
9
10
39.

What are the missing coefficients? ​ (a)   H2 + ​ (b)   O2 → 2 H2O

Choose from the below words
2
1
3
4
5
6
7
8
9
10
40.

What are the missing coefficients? 4 Al + ​ (a)   O2 → ​ (b)   Al2O3

Choose from the below words
3
2
1
4
5
6
7
8
9
10
41.

What are the missing coefficients? ​ (a)   P4 + ​ (b)   O2 → 2 P2O5

Choose from the below words
1
5
2
3
4
6
7
8
9
10
42.

What are the missing coefficients? ​ (a)   Al + ​ (b)   Br2 → 2 AlBr3

Choose from the below words
2
3
1
4
5
6
7
8
9
10
43.

What are the missing coefficients? ​ (a)   Cr + 3 O2 → ​ (b)   Cr2O3

Choose from the below words
4
2
1
3
5
6
7
8
9
10
44.

What are the missing coefficients? 2 NaClO3 → ​ (a)   NaCl + ​ (b)   O2

Choose from the below words
2
3
1
4
5
6
7
8
9
10
45.

What are the missing coefficients? ​ ___ AlBr3 + ___ Cl2 → ___ AlCl3 + 3 Br2

(a)  

Choose from the below words
2, 3, 2, 3
2, 1, 2, 3
3, 2, 2, 3
2, 4, 2, 3
3, 2, 1, 3
4, 3, 2, 3
46.

What are the missing coefficients? ​ (a)   H2 + ​ (b)   N2 → ​ (c)   NH3

Choose from the below words
3
1
2
4
5
6
47.

What are the missing coefficients? ___ KClO3 → ___ KCl + ___ O2

(a)  

Choose from the below words
2, 2, 3
2, 2, 1
3, 2, 2
4, 2, 3
2, 3, 2
1, 1, 3
1, 2, 3
48.

What are the missing coefficients? ​ (a)   Fe2O3 + ​ (b)   C → ​ (c)   Fe + 3 CO2

Choose from the below words
2
3
4
1
5
6
7
8
9
10
49.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 → H2SO4

c)

2Na + 2H2O → 2NaOH + H2

50.

What are the missing coefficients?

___ Mg +  ___ HCl →  1 MgCl2 + 1 H2

(a)  

Choose from the below words
1, 2, 1, 1
1, 1, 1, 1
1, 3, 1, 1
4, 2, 1, 1
51.

What are the missing coefficients?

​ (a)   Al + ​ (b)   HCl → ​ (c)   H2 + 2 AlCl3

Choose from the below words
2
6
3
1
4
5
7
8
9
10
52.

What are the missing coefficients?

___ Ca + ___ H2O → ___ Ca(OH)2 + 1 H2

a)

1, 1, 1

b)

1, 2, 1

c)

1, 3, 1

d)

4, 2, 1

53.

What are the missing coefficients?

___ CO + ___ Fe2O3 → 2 Fe + ___ CO2

a)

3, 1, 3

b)

2, 1, 3

c)

3, 2, 2

d)

4, 1, 3

54.

What are the missing coefficients?

___ AgNO3 + 1 H2S → ___ Ag2S + ___ HNO3

a)

2, 1, 2

b)

1, 1, 1

c)

3, 1, 2

d)

2, 4, 1

55.

What are the missing coefficients?

___ H2 + ___ S8 → ___ H2S

a)

8, 1, 8

b)

6, 1, 8

c)

4, 1, 8

d)

8, 1, 16

56.

What are the missing coefficients?

___ N2 + ___ O2 → ___ NO

a)

1, 1, 1

b)

1, 1, 2

c)

3, 1, 2

d)

1, 1, 4

57.

What are the missing coefficients?

___ Al + ___ HCl → 3 H2 + ___ AlCl3

a)

2, 6, 2

b)

3, 6, 2

c)

2, 4, 2

d)

2, 6, 1

58.

What are the missing coefficients?

1 Zn + ___ HCl → ___ ZnCl2 + ___ H2

a)

4, 2, 1, 1

b)

1, 3, 1, 1

c)

1, 2, 1, 1

d)

1, 1, 1, 1

59.

What are the missing coefficients?

___ Mn + ___ HNO3 → 1 Mn(NO3)2 + ___ H2

a)

1, 1, 1

b)

1, 2, 1

c)

3, 2, 1

d)

2, 1, 2

60.

Which of the following equations are correctly balanced?

a)

12 CO2 + 1 H2O → 1 C6H12O6 + 1 O2

b)

1 CO2 + 1 H2O → 3 C6H12O6 + 1 O2

c)

1 CO2 + 9 H2O → 1 C6H12O6 + 1 O2

d)

6 CO2 + 6 H2O → 1 C6H12O6 + 6 O2

61.

Balance this equation:

___ HgO → ___ Hg + ___ O2

a)

It is balanced.

b)

2 HgO → 2 Hg + 1 O2

c)

2 HgO → 1 Hg + 1 O2

d)

1 HgO → 1 Hg + 2 O2

62.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
63.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

64.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
65.
The left side of the equation below is called
a)
Products
b)
Reactants
66.
The right side of the equation below is called the
a)
products
b)
reactants
67.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
a)
Coefficient
b)
reactant
c)
subscript
d)
product 
68.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
69.

In the chemical reaction 2H₂ + O₂ → 2H₂O, what are the reactants?

a)

H₂O

b)

H₂ and O₂

c)

O₂ and H₂O

d)

2H₂O

70.

In the synthesis reaction 2Na + Cl₂ → 2NaCl, what is the product?

a)

Na

b)

Cl₂

c)

NaCl

d)

2Na + Cl₂

71.

In the reaction 2Fe + 3Cl₂ → 2FeCl₃, what are the products?

a)

Fe and Cl₂

b)

FeCl₂

c)

FeCl₃

d)

2Fe and 3Cl₂

72.

Identify the reactants in the synthesis reaction N₂ + 3H₂ → 2NH₃.

a)

NH₃

b)

N₂ and H₂

c)

N₂ and NH₃

d)

H₂ and NH₃

73.

In the chemical reaction 2Al + 3CuO → Al₂O₃ + 3Cu, which substance is a reactant?

a)

Al₂O₃

b)

Cu

c)

Al

d)

CuO

74.

What is underlined in the chemical equation below?

Na + Cl ---> NaCl

a)

Products

b)

Reactants

75.

Select all the Reactants

a)
b)
c)
76.

Select all the reactants

a)
b)
c)
77.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
78.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
79.
What is the number in front of a chemical formula called?
a)
Coefficient
b)
Superscript
c)
Subscript
d)
Exponent
80.

In the chemical equation, 2Mg + O2 → 2MgO2Mg\ +\ O_2\ \rightarrow\ 2MgO , the product(s) are....

a)

Mg

b)

O2O_2

c)

MgOMgO_{ }

d)

Mg + O2Mg\ +\ O_2

81.

To balance a chemical equation, it may be necessary to adjust the ________.

a)

subscripts

b)

formulas of the products

c)

formulas of the reactants

d)

coefficients

82.

The number to the lower right of an element that shows the number of atoms of a specific element is called ?

a)

Product

b)

Subscript

c)

Chemical Formula

d)

Reactant

83.

The number before a chemical formula that shows the number of molecules present is call a?

a)

Yield

b)

Product

c)

Coefficient

d)

Reactant

84.

______ is the end result of a chemical reaction.

a)

Product

b)

Yield

c)

Subscript

d)

Reactant

85.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
86.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
87.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
88.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
89.
What is the arrow pointing to?
a)
coefficient
b)
subscript
c)
reactant
d)
product
90.
What are the arrows pointing to?
a)
coefficient
b)
subscript
c)
reactant
d)
product
91.
Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.
a)
destroyed
b)
rearranged
c)
transferred
d)
changed
92.

What are the coefficients?

___ Li + ​ ___ Cl2 → ​ ___ LiCl

(write your coefficients separated with NO commas and NO spaces: 111)

(a)  

93.

What are the missing coefficients? ​ ​ (a)   P4 + ​ ​ (b)   O2 → ​ (c)   P2O5

Choose from the below words
1
5
2
3
4
6
7
8
9
10
94.

What are the missing coefficients? ​ (a)   Cr + ​ (b)   O2 → ​ (c)   Cr2O3

Choose from the below words
4
3
2
1
5
6
7
8
9
10
95.

What are the missing coefficients? ​ ___ AlBr3 + ___ Cl2 → ___ AlCl3 + ___ Br2

(a)  

Choose from the below words
2, 3, 2, 3
2, 1, 2, 3
3, 2, 2, 3
2, 4, 2, 3
3, 2, 1, 3
4, 3, 2, 3
96.

Match the coefficient to the formula that it goes with in this equation. If the number doesn't go with anything, match it to the n/a:

___ H2 + ​ ___ N2 → ​ ___ NH3

a)

3

1.

H2

b)

1

2.

N2

c)

2

3.

NH3

d)

4

4.

n/a

97.

What are the missing coefficients? ​ (a)   Fe2O3 + ​ (b)   C → ​ (c)   Fe + 3 CO2

Choose from the below words
2
3
4
1
5
6
7
8
9
10
98.

What are ALL 4 of the coefficients?

___ Ca + ___ H2O → ___ Ca(OH)2 + 1 H2

(write your coefficients separated with NO commas and NO spaces: 111)1

(a)  

99.

Which of the following equations are correctly balanced?

a)

12 CO2 + 1 H2O → 1 C6H12O6 + 1 O2

b)

1 CO2 + 1 H2O → 3 C6H12O6 + 1 O2

c)

1 CO2 + 9 H2O → 1 C6H12O6 + 1 O2

d)

6 CO2 + 6 H2O → 1 C6H12O6 + 6 O2

100.

___ CO2 + ___ H2O → ___ C6H12O6 + ___ O2

(a)  

101.

Which number should go in the blanks?

___ Al(NO3)3 + ___ NaOH -> ___ Al(OH)3 + ___ NaNO3

(write your coefficients separated with NO commas and NO spaces: 1111)

(a)  

102.

Step 1: Balance the equation.

Step 2: Add all 4 coefficients together for your answer.

___ Sn(NO2)4 + ___ K3PO4 -> ___ KNO2 + ___ Sn3(PO4)4

​ (a)  

Choose from the below words
20
16
22
10
25
18
24

Similar Resources on Wayground

Quiz Sr3ScA & C (2023)

100 questions

Quiz Sr3ScA & C (2023)

quiz

Worksheet

•

12th Grade

pAP 2019 fall SER

100 questions

pAP 2019 fall SER

quiz

Worksheet

•

10th - 12th Grade

Final Review 2023

105 questions

Final Review 2023

quiz

Worksheet

•

10th Grade

SOAL LATIHAN KIMIA PENILAIAN AKHIR SEMESTER 1 KLS X

102 questions

SOAL LATIHAN KIMIA PENILAIAN AKHIR SEMESTER 1 KLS X

quiz

Worksheet

•

10th Grade

Chemistry Unit 1 Test Review

98 questions

Chemistry Unit 1 Test Review

quiz

Worksheet

•

9th - 12th Grade

Periodic Table & Trends Quiz Review

97 questions

Periodic Table & Trends Quiz Review

quiz

Worksheet

•

10th - 12th Grade

End of Module 2 Test

100 questions

End of Module 2 Test

quiz

Worksheet

•

9th - 12th Grade