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atoms, elements, and compounds.

Total questions: 40

Worksheet time: 21mins

Name
Class
Date
1.
A pure substance...
a)
is an element or a compound
b)
is an element or a mixture
c)
is a compound or a mixture
d)
is a mixture
2.

1 A substance made up of two or more chemically combined elements is —

a)

an element

b)

mixture

c)

compound

d)

solution

3.
NaHCO3 is an example of —
a)
an abbreviation
b)
a compound
c)
a mixture
d)
an element
4.
A substance made of only one type of atom is called —
a)
an element
b)
a mixture
c)
a compound
d)
a salt
5.

Table salt, or sodium chloride has the chemical formula NaCl. How is sodium chloride classified?

a)

as an element

b)

. as a compound

c)

as a mixture

d)

as a liquid

6.

Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?

a)

an element

b)

compound

c)

mixture

d)

suspension

7.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
8.

This picture represents which of the following?

a)

A single element

b)

Mixture of molecules

c)

mixture of atoms

d)

mixture of compounds

9.

What does this illustrate

a)

Elements

b)

Compunds

c)

Mixture of Elements and Compunds

d)

Mixture of Compounds

10.
Which of the following is an element?
a)
Sugar
b)
Salt
c)
Water
d)
Oxygen
11.
This diagram represents a _____.
a)
pure substance that is a compound
b)
mixture of elements
c)
pure substance that is an element
d)
mixture of compounds
12.

This diagram represents a _____.

a)

Element

b)

Compound

c)

Mixture of compound and element

d)

Mixture of two elements

13.

Zinc

a)

Z

b)

Zi

c)

ZN

d)

Zn

14.

Hydrogen

a)

Hy

b)

H

c)

Hr

d)

Hn

15.

Iron

a)

Ir

b)

In

c)

Fe

d)

FE

16.

Potassium

a)

P

b)

K

c)

Pt

d)

k

17.

Which compound is best represented by this particle diagram?

a)

NH3

b)

H2O

c)

CH4

d)

HCl

18.

Which compound is best represented by this particle diagram?

a)

C2H6

b)

C6H12O6

c)

CO2

d)

NaCl

19.

How many types of atoms are in K₂SO₄

a)

7

b)

3

c)

2

d)

4

20.

How many total atoms are in K₂SO₄

a)

7

b)

2

c)

4

d)

3

21.
A pure substance...
a)
is an element or a compound
b)
is an element or a mixture
c)
is a compound or a mixture
d)
is a mixture
22.

1 A substance made up of two or more chemically combined elements is —

a)

an element

b)

mixture

c)

compound

d)

solution

23.
NaHCO3 is an example of —
a)
an abbreviation
b)
a compound
c)
a mixture
d)
an element
24.
A substance made of only one type of atom is called —
a)
an element
b)
a mixture
c)
a compound
d)
a salt
25.

Table salt, or sodium chloride has the chemical formula NaCl. How is sodium chloride classified?

a)

as an element

b)

. as a compound

c)

as a mixture

d)

as a liquid

26.

Brass is a metal that is bright red and gold. It is formed by combining, not chemically, two elements, zinc and copper. Based on the information, how would brass be classified?

a)

an element

b)

compound

c)

mixture

d)

suspension

27.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)
Mixture of Elements
d)
Mixture of Compounds
28.

This picture represents which of the following?

a)

A single element

b)

Mixture of molecules

c)

mixture of atoms

d)

mixture of compounds

29.

What does this illustrate

a)

Elements

b)

Compunds

c)

Mixture of Elements and Compunds

d)

Mixture of Compounds

30.
Which of the following is an element?
a)
Sugar
b)
Salt
c)
Water
d)
Oxygen
31.
This diagram represents a _____.
a)
pure substance that is a compound
b)
mixture of elements
c)
pure substance that is an element
d)
mixture of compounds
32.

This diagram represents a _____.

a)

Element

b)

Compound

c)

Mixture of compound and element

d)

Mixture of two elements

33.

Zinc

a)

Z

b)

Zi

c)

ZN

d)

Zn

34.

Hydrogen

a)

Hy

b)

H

c)

Hr

d)

Hn

35.

Iron

a)

Ir

b)

In

c)

Fe

d)

FE

36.

Potassium

a)

P

b)

K

c)

Pt

d)

k

37.

Which compound is best represented by this particle diagram?

a)

NH3

b)

H2O

c)

CH4

d)

HCl

38.

Which compound is best represented by this particle diagram?

a)

C2H6

b)

C6H12O6

c)

CO2

d)

NaCl

39.

How many types of atoms are in K₂SO₄

a)

7

b)

3

c)

2

d)

4

40.

How many total atoms are in K₂SO₄

a)

7

b)

2

c)

4

d)

3

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