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Balancing Chemical Equations Quiz

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

What is the purpose of balancing a chemical equation?

a)

To change the compounds involved

b)

To conserve mass

c)

To remove elements

d)

To predict products

2.

The Law of Conservation of Mass states:

a)

Energy can be created

b)

Mass cannot be created or destroyed

c)

Atoms can change types

d)

Mass can disappear

3.

In the equation , which element is unbalanced?

a)

Hydrogen

b)

Nitrogen

c)

Oxygen

d)

Carbon

4.

What should you adjust to balance an equation?

a)

Subscripts

b)

Coefficients

c)

Elements

d)

Compounds

5.

In balancing , the coefficient of is:

a)

1

b)

3

c)

4

d)

2

6.

What does the periodic table provide about each element?

a)

Temperature

b)

Atomic mass

c)

Reactions

d)

Compounds

7.

In the unbalanced reaction , what element should be balanced last?

a)

Carbon

b)

Oxygen

c)

Nitrogen

d)

Hydrogen

8.

Which is the correct balanced form of ?

a)
b)
c)
d)
9.

To balance , how many are needed?

a)

1

b)

2

c)

4

d)

5

10.

Which element in is diatomic?

a)

Oxygen

b)

Hydrogen

c)

Both

d)

Neither

11.

How many atoms of hydrogen are in ?

a)

4

b)

3

c)

2

d)

1

12.

Which element symbol is found on the periodic table?

a)

H

b)

H2O

c)

CH4

d)

CO2

13.

The correct balanced form of is:

a)
b)
c)
d)
14.

Which of the following is a reactant in ?

a)

Oxygen

b)

Ammonia

c)

Hydrogen

d)

Water

15.

In , which compound is formed?

a)

NaCl

b)

NaCl2

c)

ClNa2

d)

Na2Cl

16.

What is the balanced form of ?

a)
b)
c)
d)
17.

When balancing equations, why is it important not to change subscripts?

a)

It makes balancing easier

b)

Subscripts don't affect equations

c)

Changing subscripts changes the substance

d)

Subscripts represent temperature

18.

In the equation , which coefficient balances ?

a)

1

b)

2

c)

3

d)

4

19.

The periodic table helps with balancing equations by:

a)

Showing atomic color

b)

Providing atomic masses and symbols

c)

Changing subscripts

d)

Indicating temperature

20.

Which of the following is a diatomic molecule?

a)

Ne

b)

O2

c)

CO2

d)

H2O

21.

Which number represents the coefficient in ?

a)

2

b)

3

c)

6

d)

1

22.

In , how many atoms of bromine are in the reactants?

a)

1

b)

2

c)

3

d)

4

23.

For , how many oxygen molecules are needed?

a)

3

b)

5

c)

4

d)

6

24.

When balancing an equation, what is the purpose of adding coefficients?

a)

To change the element

b)

To make the number of atoms equal on both sides

c)

To change the charge

d)

To identify the compound

25.

Which is the balanced form of ?

a)
b)
c)
d)
26.

The symbol for sodium on the periodic table is:

a)

Na

b)

S

c)

Sa

d)

Sd

27.

In a balanced equation, how many total atoms of oxygen are on both sides of ?

a)

1

b)

2

c)

3

d)

4

28.

What is the balanced form of ?

a)
b)
c)
d)
29.

In the equation , which element is a product?

a)

Ca

b)

H2O

c)

H2

d)

Ca(OH)2

30.

How many total atoms are in ?

a)

2

b)

3

c)

6

d)

4

31.

In the equation , the balanced form requires how many molecules?

a)

1

b)

2

c)

3

d)

4

32.

Which element has the atomic number 1 on the periodic table?

a)

Hydrogen

b)

Helium

c)

Oxygen

d)

Carbon

33.

When balancing the reaction , how many atoms of nitrogen are in the products?

a)

2

b)

3

c)

4

d)

1

34.

In the equation , which type of reaction is taking place?

a)

Synthesis

b)

Combustion

c)

Decomposition

d)

Displacement

35.

What is the balanced form of ?

a)
b)
c)
d)
36.

In , what coefficient balances ?

a)

1

b)

2

c)

3

d)

4

37.

In the balanced equation , how many molecules of are produced?

a)

2

b)

1

c)

3

d)

4

38.

Which element is diatomic in its natural form?

a)

Neon

b)

Argon

c)

Nitrogen

d)

Sulfur

39.

In , how many molecules balance the equation?

a)

7

b)

5

c)

4

d)

3

40.

Which of the following represents a product in the reaction ?

a)

Zn

b)

HCl

c)

ZnCl2

d)

H2

41.

What type of reaction is represented by ?

a)

Combination

b)

Decomposition

c)

Combustion

d)

Displacement

42.

In the reaction , how many molecules are produced when 2 decompose?

a)

3

b)

2

c)

4

d)

1

43.

What is the balanced form of ?

a)
b)
c)
d)
44.

In the reaction , what is the product besides ?

a)

CaCO3

b)

CaCO

c)

CaO

d)

CO3

45.

The atomic number represents the number of:

a)

Protons

b)

Electrons

c)

Neutrons

d)

Isotopes

46.

What is the correct balanced form of ?

a)
b)
c)
d)
47.

In , which type of reaction occurs?

a)

Single displacement

b)

Double displacement

c)

Decomposition

d)

Combination

48.

The element with the symbol "O" is:

a)

Oxygen

b)

Oganesson

c)

Osmium

d)

Olivine

49.

In , the compound is called:

a)

Sodium oxide

b)

Sodium hydroxide

c)

Sodium peroxide

d)

Sodium hydride

50.

Which formula represents a molecule with two atoms?

a)

H2O

b)

O2

c)

CO2

d)

NaCl

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