Free Printable Atoms and Molecules Quiz

1.

In a ball-and-stick model, the balls represent:

a)

Atoms

b)

Molecules

c)

Protons only

d)

Electrons

2.

In a ball-and-stick model, the sticks represent:

a)

Atoms

b)

Chemical bonds

c)

Energy

d)

Neutrons

3.

A molecule is made of:

a)

One atom

b)

Two or more atoms joined together

c)

Energy only

d)

Electrons only

4.

What does a large ball in a model usually show?

a)

A smaller atom

b)

A proton

c)

A different type of atom

d)

A broken atom

5.

In a model of water (H₂O), how many hydrogen atoms are there?

a)

1

b)

2

c)

3

d)

0

6.

In a model of carbon dioxide (CO₂), how many oxygen atoms are there?

a)

1

b)

2

c)

3

d)

4

7.

What holds atoms together in a molecule?

a)

Magnets

b)

Bonds

c)

Water

d)

Energy waves

8.

What is a molecule?

a)

A single atom

b)

A group of atoms bonded together

c)

A type of cell

d)

A liquid

9.

In a ball-and-stick model of O₂, how many oxygen atoms are shown?

a)

1

b)

2

c)

3

d)

4

10.

Which model would show the most detail?

a)

Ball-and-stick model

b)

Picture of a rock

c)

Drawing of a tree

d)

A weather map

11.

What does the formula H₂O represent?

a)

Oxygen

b)

Hydrogen

c)

Water

d)

Salt

12.

What does CO₂ stand for?

a)

Carbon monoxide

b)

Carbon dioxide

c)

Oxygen only

d)

Water

13.

In H₂O, the number 2 means:

a)

2 Oxygen atoms

b)

2 Hydrogen atoms

c)

2 Molecules

d)

2 Bonds

14.

Which model matches H₂O?

a)

1 ball and 2 sticks

b)

2 small balls connected to 1 larger ball

c)

3 large balls connected in a row

d)

1 small ball by itself

15.

What is the formula for carbon dioxide?

a)

H₂O

b)

CO₂

c)

O₂

d)

CH₄

16.

Which formula represents oxygen gas?

a)

H₂O

b)

CO₂

c)

O₂

d)

CH₄

17.

In a ball-and-stick model of O₂, you would see:

a)

1 ball

b)

2 balls connected

c)

3 balls in a triangle

d)

4 balls

18.

In a model of CH₄, how many hydrogen atoms are there?

a)

1

b)

2

c)

3

d)

4

19.

Which formula matches a model with 1 carbon atom and 4 hydrogen atoms?

a)

H₂O

b)

CO₂

c)

CH₄

d)

O₂

20.

Which formula matches a model with 2 oxygen atoms connected?

a)

O₂

b)

CO₂

c)

H₂O

d)

CH₄

21.

A model with 2 hydrogen atoms and 1 oxygen atom is:

a)

H₂O

b)

O₂

c)

CO₂

d)

CH₄

22.

A model with 1 carbon atom and 2 oxygen atoms is:

a)

H₂O

b)

CO₂

c)

O₂

d)

CH₄

23.

A model with 1 oxygen atom and 1 hydrogen atom is:

a)

H₂O

b)

OH

c)

H₂

d)

O₂

24.

A model with 2 oxygen atoms is:

a)

CO₂

b)

O₂

c)

H₂O

d)

CH₄

25.

A model with 1 carbon atom and 4 hydrogen atoms is:

a)

CO₂

b)

O₂

c)

CH₄

d)

H₂O

26.

A model with 2 hydrogen atoms is:

a)

O₂

b)

H₂

c)

CO₂

d)

CH₄

27.

A model with 1 carbon atom and 1 oxygen atom is:

a)

CO

b)

CO₂

c)

CH₄

d)

H₂O

28.

A model with 2 nitrogen atoms is:

a)

N₂

b)

O₂

c)

CO₂

d)

H₂O

29.

A model with 3 oxygen atoms is likely:

a)

CO

b)

CO₂

c)

O₃

d)

H₂O

30.

A model with 2 hydrogen atoms and 2 oxygen atoms is:

a)

H₂O₂

b)

H₂O

c)

O₂

d)

CO₂

31.

How many atoms are in H₂O?

a)

1

b)

2

c)

3

d)

4

32.

How many oxygen atoms are in CO₂?

a)

1

b)

2

c)

3

d)

4

33.

How many hydrogen atoms are in CH₄?

a)

1

b)

2

c)

3

d)

4

34.

How many atoms are in O₂?

a)

1

b)

2

c)

3

d)

4

35.

How many total atoms are in CO₂?

a)

2

b)

3

c)

4

d)

5

36.

How many atoms are in H₂O₂?

a)

2

b)

3

c)

4

d)

5

37.

How many nitrogen atoms are in N₂?

a)

1

b)

2

c)

3

d)

4

38.

How many carbon atoms are in CH₄?

a)

1

b)

2

c)

3

d)

4

39.

How many atoms are in O₃?

a)

1

b)

2

c)

3

d)

4

40.

How many total atoms are in C₂H₆?

a)

4

b)

6

c)

8

d)

10

41.

A model with 1 oxygen atom and 1 hydrogen atom is:

a)

H₂O

b)

OH

c)

H₂

d)

O₂

42.

A model with 2 oxygen atoms is:

a)

CO₂

b)

O₂

c)

H₂O

d)

CH₄

43.

A model with 1 carbon atom and 4 hydrogen atoms is:

a)

CO₂

b)

O₂

c)

CH₄

d)

H₂O

44.

A model with 2 hydrogen atoms is:

a)

O₂

b)

H₂

c)

CO₂

d)

CH₄

45.

A model with 1 carbon atom and 1 oxygen atom is:

a)

CO

b)

CO₂

c)

CH₄

d)

H₂O

46.

A model with 2 nitrogen atoms is:

a)

N₂

b)

O₂

c)

CO₂

d)

H₂O

47.

A model with 3 oxygen atoms is likely:

a)

CO

b)

CO₂

c)

O₃

d)

H₂O

48.

A model with 2 hydrogen atoms and 2 oxygen atoms is:

a)

H₂O₂

b)

H₂O

c)

O₂

d)

CO₂

49.

How many atoms are in H₂O?

a)

1

b)

2

c)

3

d)

4

50.

How many oxygen atoms are in CO₂?

a)

1

b)

2

c)

3

d)

4

51.

How many hydrogen atoms are in CH₄?

a)

1

b)

2

c)

3

d)

4

52.

How many atoms are in O₂?

a)

1

b)

2

c)

3

d)

4

53.

How many total atoms are in CO₂?

a)

2

b)

3

c)

4

d)

5

54.

How many atoms are in H₂O₂?

a)

2

b)

3

c)

4

d)

5

55.

How many nitrogen atoms are in N₂?

a)

1

b)

2

c)

3

d)

4

56.

How many carbon atoms are in CH₄?

a)

1

b)

2

c)

3

d)

4

57.

How many atoms are in O₃?

a)

1

b)

2

c)

3

d)

4

58.

How many total atoms are in C₂H₆?

a)

4

b)

6

c)

8

d)

10

59.

What is an element?

a)

A combination of atoms

b)

A pure substance made of only one kind of atom

c)

A type of rock

d)

A chemical mixture

60.

What is a compound?

a)

One type of atom

b)

Two or more different atoms joined together

c)

A solution

d)

A gas only

61.

O₂ is an example of:

a)

An element

b)

A compound

c)

A mixture

d)

A liquid

62.

H₂O is an example of:

a)

An element

b)

A compound

c)

A mixture

d)

A metal

63.

CO₂ is classified as a:

a)

Mixture

b)

Element

c)

Compound

d)

Gas only

64.

N₂ is a(n):

a)

Element

b)

Compound

c)

Mixture

d)

Solution

65.

NaCl (salt) is a:

a)

Compound

b)

Element

c)

Mixture

d)

Solution

66.

CH₄ (methane) is a:

a)

Element

b)

Compound

c)

Mixture

d)

Gas only

67.

Which of these is an element?

a)

H₂O

b)

CO₂

c)

O₂

d)

NaCl

68.

Which of these is a compound?

a)

O₂

b)

H₂

c)

H₂O

d)

N₂

69.

What is the formula for water?

a)

CO₂

b)

H₂O

c)

O₂

d)

CH₄

70.

Which formula shows a compound?

a)

O₂

b)

H₂

c)

H₂O

d)

N₂

71.

Which formula shows an element?

a)

CO₂

b)

H₂O

c)

NaCl

d)

O₂

72.

NaCl represents:

a)

Water

b)

Carbon dioxide

c)

Salt (compound)

d)

Oxygen

73.

Which is an element?

a)

H₂O

b)

CO₂

c)

H₂

d)

CH₄

74.

Which formula shows carbon dioxide?

a)

H₂O

b)

CO₂

c)

O₂

d)

CH₄

75.

N₂ is an example of:

a)

A compound

b)

An element

c)

A mixture

d)

A liquid

76.

CH₄ is classified as a:

a)

Compound

b)

Element

c)

Mixture

d)

Metal

77.

Which formula shows salt?

a)

NaCl

b)

CO₂

c)

H₂O

d)

O₂

78.

O₃ represents:

a)

Oxygen gas (element)

b)

A compound

c)

A metal

d)

A solution

79.

Sort the following as Element or Compound: O₂, CO₂, NaCl, H₂, CH₄, N₂, H₂O, O₃, C (Carbon), HCl

4 lines

80.

Given a model: Two identical balls connected — this shows:

a)

Compound

b)

Element

81.

Three different balls connected — this shows:

a)

Compound

b)

Element

82.

A single ball alone represents:

a)

Compound

b)

Element

83.

H₂O model shows:

a)

Compound

b)

Element

84.

O₂ model shows:

a)

Element

b)

Compound

85.

NaCl model shows:

a)

Compound

b)

Element

86.

CH₄ model shows:

a)

Compound

b)

Element

87.

C (Carbon atom alone) shows:

a)

Compound

b)

Element

88.

CO₂ model shows:

a)

Compound

b)

Element

89.

N₂ model shows:

a)

Element

b)

Compound

Atoms and Molecules Quiz

Total questions: 89

Worksheet time: 47mins

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