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Worksheets

Chemical Equations and Balancing

Total questions: 25

Worksheet time: 25mins

Name
Class
Date
1.

Is this equation balanced?

SO3 + H2O --> H2SO4

a)

yes

b)

no

2.

Is this equation balanced?

  Mg2 + HCl --->  MgCl2 + H2

a)

Yes

b)

No

3.

The coefficient in 3H2O is

a)

6

b)

5

c)

2

d)

3

4.

What is the left part of a chemical equation called?

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

5.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

6.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

7.

What is the little number after an element in a chemical equation called?

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

8.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

9.

In the equation, 2Mg + O2 ---> 2MgO, which are the REACTANTS?

a)

Mg and O

b)

Mg and MgO

c)

MgO

d)

O and MgO

10.

This is used to represent the amount of each atom in a molecule. What is the arrow pointing to?

a)

Exponent

b)

Coefficient

c)

Molecule

d)

Subscript

11.

What is the arrow in a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactant

b)

Product

c)

Yields

12.

What is the part of the chemical equation in green called? 
Fe + S --> FeS

a)

products

b)

reactants

c)

yield

d)

chemical formula

13.

Is this balanced?
Al + O2 → 2Al2O3

a)

Yes

b)

No

14.

Is this equation balanced?

N2 + O2 --> N2O2

a)

No

b)

Yes

15.

How many Sodium (Na) are in 3NaCl?

a)

1

b)

3

c)

6

16.

Is the following equation balanced?...
Al + O2 --> 2Al2O3

a)

Yes!

b)

No!

17.

Is the following equation balanced?
2C2H2 + 5O2 --> 4CO2 + 2H2O

a)

yes

b)

no

18.

Which of the following equations are correctly balanced?

a)

12CO2 +H2O --> C6H12O6 + O2

b)

CO2 + 9H2O --> C6H12O6 + O2

c)

CO2 + H2O --> 3C6H12O6 + O2

d)

6CO2 + 6H2O --> C6H12O6 + 6O2

19.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

20.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

21.

Which of the following chemical equations is balanced?

a)

@@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

b)

@@ ext{C}_3 ext{H}_8 + 4 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

c)

@@ ext{C}_3 ext{H}_8 + 6 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

d)

@@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 4 ext{CO}_2 + 4 ext{H}_2 ext{O}@@

22.

What is the coefficient of O2\text{O}_2 in the balanced equation for the combustion of methane: @@ ext{CH}_4 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@?

a)

1

b)

2

c)

3

d)

4

23.

In the chemical equation @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O} ,whatistheroleof, what is the role of ext{O}_2@@?

a)

Reactant

b)

Product

c)

Catalyst

d)

Inhibitor

24.

Which of the following is a balanced chemical equation for the reaction of hydrogen and oxygen to form water?

a)

@@ ext{H}_2 + ext{O}_2 ightarrow ext{H}_2 ext{O}@@

b)

@@2 ext{H}_2 + ext{O}_2 ightarrow 2 ext{H}_2 ext{O}@@

c)

@@ ext{H}_2 + ext{O}_2 ightarrow 2 ext{H}_2 ext{O}@@

d)

@@2 ext{H}_2 + 2 ext{O}_2 ightarrow 2 ext{H}_2 ext{O}@@

25.

If the equation @@ ext{Fe}_2 ext{O}_3 + ext{C} ightarrow ext{Fe} + ext{CO}_2 isbalanced,whatisthecoefficientof is balanced, what is the coefficient of ext{C}@@?

a)

1

b)

2

c)

3

d)

4