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Worksheets

Atoms, Elements & Compounds

Total questions: 34

Worksheet time: 1hrs 8mins

Name
Class
Date
1.

Which of the following represents an element?

a)

H2O

b)

NaCl

c)

H2

d)

CaCO3

2.

Which of the following is not a compound?

a)

HCl

b)

NaCl

c)

Cl

d)

CO2

3.

What cannot be broken down into other substances?

a)

Compound

b)

Solids

c)

Mixture

d)

Element

4.

What is made up two or more elements that are chemically combined?

a)

Element

b)

Compound

c)

Mixture

d)

Solids

5.

How many elements are represented in the compound?

Na2CO3

a)

1

b)

2

c)

3

d)

4

6.

A combination of substances that are not chemically combined is called a(n)____________.

a)

mixture

b)

compound

c)

element

d)

metal

7.

An element is made up of only one kind of _____.

a)

isotope

b)

atom

c)

plastic

d)

metal

8.

What is H2SO4

made up of?

a)

2 hydrogen, 1 sulfur, 4 oxygen

b)

2 hydrogen & 4 sodium

c)

1 hydrogen, 2 sulfur, 4 oxygen

d)

1 hydrogen & 6 sodium

9.

How many atoms are there TOTAL in:

H2SO4

a)

3

b)

5

c)

6

d)

7

10.

This picture represents which of the following?

a)

element

b)

mixture

c)

compound

11.

What is the picture displayed?

a)

atom

b)

molecule

c)

element

d)

compound

12.

In this diagram, X represents...

a)

A compound

b)

An atom

c)

A mixture

d)

An element

13.

How many hydrogen atoms are there?

a)

1

b)

4

c)

5

d)

6

14.

How many nitrogen atoms are there?

a)

4

b)

8

c)

10

d)

20

15.

How many phosphorus atoms are there?

a)

0

b)

1

c)

3

d)

4

16.

How many oxygen atoms are there?

a)

3

b)

6

c)

8

d)

16

17.

How many molecules of methane are there?

a)

0

b)

1

c)

2

d)

4

18.

How many atoms of carbon are there?

a)

0

b)

1

c)

2

d)

3

19.

How many atoms are there total?

a)

0

b)

1

c)

4

d)

6

20.

How many atoms of carbon are there?

a)

3

b)

6

c)

18

d)

24

21.

How many elements are there?

a)

0

b)

1

c)

3

d)

5

22.

How many molecules of caffeine are there?

a)

2

b)

5

c)

10

d)

24

23.

How many carbon atoms are there?

a)

2

b)

3

c)

8

d)

16

24.

How many atoms of carbon are there?

a)

2

b)

4

c)

12

25.

How many atoms of oxygen are there?

a)

0

b)

1

c)

2

d)

3

26.

How many total atoms are there?

a)

8

b)

5

c)

3

d)

1

27.

What is identified by a chemical formula?

a)

Mixture

b)

Compound

c)

Element

d)

Atom

28.

What is identified by a chemical symbol?

a)

Mixture

b)

Compound

c)

Element

d)

Atom

29.

These CANNOT be broken down physically but CAN be broken down chemically into smaller parts.

a)

Elements

b)

Atoms

c)

Mixtures

d)

Compounds

30.

These can be broken dwon physically into individual parts.

a)

Compounds

b)

Mixtures

c)

Pure Substances

d)

Elements

31.

What is the simplest pure substance?

a)

Element

b)

Compound

c)

Mixture

d)

Molecule

32.

What is the smallest amount of an element called?

a)

Compound

b)

Mixture

c)

Atom

d)

Crystal

33.

What are the two types of compounds?

a)

Atoms and elements

b)

homogeneous and heterogeneous

c)

Molecule and crystal

d)

Pure substance and mixture

34.

Matter can be classified as...

a)

Elements and Compounds

b)

Atoms and Molecules

c)

Pure Substances and Mixtures

d)

Homogeneous and Heterogeneous

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