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Elements, Compounds, Mixtures

Total questions: 40

Worksheet time: 24mins

Name
Class
Date
1.

The smallest part of an element.....

a)

Mixture

b)

Compound

c)

Molecule

d)

atom

2.

All matter can be either a pure substance or ______.

a)

an atom

b)

a mixture

c)

an element

d)

changing

3.

The following picture is a model of a ________.

a)

Mixture

b)

Compound

c)

Molecule

d)

Element

4.
A combination of different substances that remain the same individual substances and these individual substances can be easily separated is a what?
a)
mixture
b)
compound
c)
molecule
d)
element
5.
The following picture is a _______________.
a)
compound
b)
mixture
c)
element
d)
molecule
6.

The following picture is a picture of a (n)_______.

a)

element

b)

mixture of elements

c)

compound

d)

mixture of compounds

7.

Gold (Au) is an example of a (n)________.

a)

element

b)

compound

c)

mixture

d)

molecule

8.

An example of a mixture is ___________.

a)

Helium (He)

b)

table salt ( NaCl)

c)

sugar water (C12H22O11 + H2O)

d)

potassium (K)

9.
Can an element be broken  down into a simpler substance by ordinary chemical or physical means?
a)
Yes
b)
No
10.
The parts of a compound can be separated by _________ means.
a)
any
b)
no
c)
chemical
d)
physical
11.

An example of a pure substance is ______.

a)

pepperoni pizza

b)

dirt

c)

blood

d)

distilled water (H2O)

12.

An example of a compound would be......

a)

H20

b)

N

c)

O2

d)

Ar

13.

The individual parts of a mixture are....

a)

easy to separate

b)

hard to separate

14.

The following picture is a picture of a (n) ______.

a)

mixture of elements

b)

element

c)

mixture of compounds

d)

compound

15.
Hydrogen, Calcium, and Boron are examples of _________.
a)
Mixtures
b)
Compounds
c)
Molecules
d)
Elements
16.
Salad, Chex Mix, and Lemonade are examples of _______.
a)
Mixtures
b)
Compounds
c)
Molecules
d)
Elements
17.

A substance that is made of two or more different types of atoms chemically bonded together is a ________.

a)

mixture

b)

compound

c)

molecule

d)

element

18.
The following picture is a picture of a _____.
a)
element
b)
compound
c)
mixture of elements
d)
mixture of compounds
19.
The following picture is a picture of a _____.
a)
mixture of elements 
b)
mixture of compounds
c)
mixture of elements & compounds
d)
compound
20.
An example of an element would be ______.
a)
H2O
b)
NaCl
c)
CO2
d)
Al
21.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
22.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
23.

Which of the following is not a compound?

a)

HCl

b)

Cl

c)

NaCl

d)

CO2

24.

Which of the following represents a molecule of an element?

a)

H2O

b)

H2

c)

NaCl

d)

CaCO3

25.
a)
1
b)
2
c)
3
d)
4
26.
a)
1
b)
2
c)
3
d)
4
27.
The basic unit of matter is
a)
a mixture
b)
a substance
c)
an atom
d)
a compound
28.
Which of the following would be an example of a chemical formula:
a)
C6H12O6
b)
F= ma
c)
2 H2 + O2 -> 2 H2O
d)
6.02 x 10 23
29.
Which of the following is not a compound?
a)
HCl
b)
Cl2
c)
NaCl
d)
CO2
30.

Salt water is a mixture. It is boiled and the water completely evaporates, salt (NaCl) is left in the bottom of the beaker. Which of the following is left in the beaker?

a)

Compound

b)

Element

c)

Mixture

d)

None of the Above

31.

How many total atoms are in the compound N2O?

a)

1

b)

2

c)

3

d)

4

32.

How many different elements make up N2O?

a)

1

b)

2

c)

3

d)

4

33.

How many total atoms are found in CO2?

a)

3

b)

5

c)

6

d)

9

34.

How many different elements are found in CaOH2?

a)

1

b)

2

c)

3

d)

4

35.

Which of the following is an example of a chemical symbol?

a)

Fe2O3

b)

H2O + NaCl

c)

Ca

36.

Chemical symbols represent....

a)

elements

b)

mixtures

c)

compounds

37.

What holds hydrogen together with oxygen in one molecule of water?

a)

chemical symbols

b)

ions

c)

protons

d)

chemical bonds

38.

The individual parts of a compound like Na and Cl in salt (NaCl) are easy to separate from one another.

a)

true

b)

false

39.

Which of the following can be found on the periodic table?

a)

elements

b)

compounds

c)

mixtures

40.

Which of the following is true about hydrogen gas (H2)?

a)

It is a mixture

b)

It is a compound but not a molecule

c)

It is an compound and a molecule

d)

It is a molecule but not a compound

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