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Elements compounds mixtures

Total questions: 20

Worksheet time: 10mins

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 combinedelements is —
a)
an element
b)
mixture
c)
compound
d)
solution
3.
 A substance that cannot be broken down into any other substance by ordinarychemical means is called —
a)
molecule
b)
mixture
c)
element
d)
compound
4.
Two or more physically combined substances form —
a)
a compoud
b)
an acid
c)
an element
d)
a mixture
5.
What is an example of a mixture?
a)
Table salt
b)
Salt water
c)
Oxygen
d)
Air
6.
A substance made of only one type of atom is called —
a)
an element
b)
a mixture
c)
a compound
d)
a salt
7.
Which of these substances is an example of a solution?
a)
milk
b)
sweet tea
c)
mercury
d)
concrete
8.
Which of the following is a way in which elements and compounds are similar?
a)
Elements and compounds are pure substances.
b)
Elements and compounds are both made up of different kinds of atoms.
c)
Elements and compounds can both be broken down by physical means.
d)
Elements and compounds are listed on the periodic table.
9.
What is an example of an element?
a)
Oxygen
b)
Pure water
c)
Air
d)
Table salt
10.
What is an example of an element?
a)
Oxygen
b)
Pure water
c)
Air
d)
Table salt
11.
Two or more substances in the same place but NOT chemically combined or in a specific ratio is called —
a)
a compound 
b)
a pure substance
c)
an element
d)
a mixture
12.

Which is the best example of a pure substance?

a)

pizza

b)

gold

c)

saltwater

d)

air

13.

Which substance is a compound?

a)

copper

b)

magnesium

c)

saltwater

d)

water

14.

What kind of substance is composed of two or more elements that are chemically combined?

a)

element

b)

mixture

c)

solution

d)

compound

15.

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

16.

How are mixtures separated?

a)

Chemical changes

b)

Physical Changes

c)

Chemical Properties

d)

Physical Properties

17.

Earth’s air is made up of molecules of different gases that are not joined chemically. Which term best describes air?

a)

compound

b)

mixture

c)

pure substance

d)

element

18.

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

19.

Identify the correct chemical symbol for the element Iron

a)

FE

b)

Fe

c)

Ir

d)

I

20.

A compound has different physical properties to the elements that it is formed from.

a)

True

b)

False