Free Printable Balancing Chemical Reactions Practice

1.

Balance this chemical reaction......?
__H₂O₂ ----> __H₂O + O₂

a)

2H₂O_{2 //}2H₂O

b)

1H₂O_{2 //}2H₂O

c)

2H₂O_{2 //}1H₂O

d)

H₂O_{2 //}2H₂O

2.

Which of the following equations are correctly balanced?

a)

12CO₂ + H₂O ---> C₆H₁₂O₆ + O₂

b)

CO₂ + H₂O ---> 3C₆H₁₂O₆ + O₂

c)

CO₂ + 9H₂O ---> C₆H₁₂O₆ + O₂

d)

6CO₂ + 6H₂O ---> C₆H₁₂O₆ + 6O₂

3.

Balance this equation: H₂ + Cl₂ ---> HCl

a)

It is balanced.

b)

H₂ + Cl₂ ---> 2HCl

c)

3H₂ + Cl₂ ---> 6HCl

d)

H₂ + 3Cl₂ ---> 6HCl

4.

When balancing the reaction $C_6H_{12}O_6 + O_2 \rightarrow CO_2 + H_2O$

a)

6

b)

12

c)

18

d)

24

5.

How many HCl molecules do you need to balance this equation?

2Mg + (a) HCl ---> 2MgCl₅ + 5H₂

Choose from the below words

10

1

2

5

6.

Balance this reaction: ____ AlBr₃ + ____ K₂SO₄ ---> ____ KBr + ____ Al₂(SO₄)₃

a)

1,1,1,1

b)

2,3,6,1

c)

2,6,1,1

d)

3,1,2,2

7.

Balance this equation.
_CH₄ + _O₂--> _CO₂+ _H₂O

a)

1,2,1,1

b)

2,1,2,1

c)

1,2,1,2

d)

0,2,0,2

8.

What is the right ratio of chemicals for the balanced chemical equation?

a)

3,1 --> 2,3

b)

3,2 --> 1,1

c)

3,2 --> 2,4

d)

3,2 --> 2,1

9.

Which set of coefficients will correctly balance the following chemical reactions?

a)

1,2,1,2

b)

2,1,2,1

c)

1,2,1,1

d)

2,1,1,1

10.

How many oxygen (O) atoms are in the products for the chemical reaction below?
$2Fe_2O_3\ \rightarrow\ 4Fe\ +\ 3O_{2\ }$

a)

2

b)

3

c)

6

d)

9

e)

12

11.

Some students decomposed potassium chlorate powder into potassium chloride and oxygen gas. Which equation for this reaction is correctly balanced?

a)

$2PClO_{3\left(s\right)}\rightarrow\ 2PCl_{\left(l\right)}+3O_{2\left(g\right)}$

b)

$PClO_{4\left(aq\right)}\rightarrow PCl_{\left(aq\right)}+2O_{2\left(g\right)}$

c)

$2KClO_{3\left(s\right)}\rightarrow2KCl_{\left(s\right)}+3O_{2\left(g\right)}$

d)

$KClO_{3\left(s\right)}\rightarrow KCl_{\left(s\right)}+O_{2\left(g\right)}$

12.

When balancing the equation $Zn + HCl \rightarrow ZnCl_2 + H_2$ , what is the coefficient for $HCl$ ?

a)

1

b)

2

c)

3

d)

4

13.

Which problem is balanced?

a)

PbO₂ + 2H₂

b)

SO₂ + H₂0 --> H₂SO₄

c)

2Na + 2H₂O --> 2NaOH + H₂

14.

Is this equation balanced?

H₃PO₄ + KOH --> K₃PO₄ + H₂O

a)

yes

b)

no

15.

What is the coefficient of $CO_2$ when balancing the equation for the combustion of ethylene, $C_2H_4 + O_2 \rightarrow CO_2 + H_2O$ ?

a)

2

b)

3

c)

4

d)

6

16.

Balance the following equation:

___ H₂+ ___ O₂→___ H₂O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

17.

___C₃H₈ +___O₂ --> ___CO₂ + ___H₂O

a)

1,5,3,4

b)

2,10,6,8

c)

already balanced

d)

1,5,5,4

18.

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

a)

YES

b)

NO

19.

Balance this equation: HgO ---> 2Hg + O₂

a)

It is balanced.

b)

2HgO ---> 2Hg + O₂

c)

2HgO ---> Hg + O₂

d)

HgO ---> Hg + 2O₂

20.

__Al + __Fe₃N₂ -->__AlN + __Fe

a)

already balanced

b)

4,2,4,6

c)

2,1,2,3

d)

1,2,1,3

21.

Balance the following chemical equation: @@ ext{C}_3 ext{H}_8 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@

a)

1, 5, 3, 4

b)

2, 10, 6, 8

c)

1, 5, 5, 4

d)

3, 5, 3, 4

22.

Which of the following chemical equations is balanced?

a)

@@ ext{C}_2 ext{H}_6 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@

b)

@@2 ext{C}_2 ext{H}_6 + 7 ext{O}_2 ightarrow 4 ext{CO}_2 + 6 ext{H}_2 ext{O}@@

c)

@@ ext{C}_2 ext{H}_6 + 3 ext{O}_2 ightarrow 2 ext{CO}_2 + 3 ext{H}_2 ext{O}@@

d)

@@2 ext{C}_2 ext{H}_6 + 5 ext{O}_2 ightarrow 4 ext{CO}_2 + 6 ext{H}_2 ext{O}@@

23.

Balance the chemical reaction: @@ ext{Fe}_2 ext{O}_3 + ext{C} ightarrow ext{Fe} + ext{CO}_2@@

a)

1, 3, 2, 3

b)

2, 3, 4, 3

c)

1, 1, 2, 2

d)

2, 1, 4, 2

24.

In the reaction @@ ext{N}_2 + ext{H}_2 ightarrow ext{NH}_3 $, what is the coefficient for$ ext{H}_2@@ when the equation is balanced?

a)

1

b)

2

c)

3

d)

4

25.

Which of the following represents a balanced chemical equation for the combustion of methane?

a)

@@ ext{CH}_4 + 2 ext{O}_2 ightarrow ext{CO}_2 + 2 ext{H}_2 ext{O}@@

b)

@@ ext{CH}_4 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@

c)

@@2 ext{CH}_4 + 3 ext{O}_2 ightarrow 2 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

d)

@@ ext{CH}_4 + 3 ext{O}_2 ightarrow ext{CO}_2 + 2 ext{H}_2 ext{O}@@

Balancing Chemical Reactions Practice

Total questions: 25

Worksheet time: 25mins

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