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Elements Compounds and Molecules

Total questions: 25

Worksheet time: 20mins

Name
Class
Date
1.

Which of the following is not a compound?

a)

HCl

b)

Cl2

c)

NaCl

d)

CO2

2.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
3.
A molecule is
a)
two or more atoms bonded together
b)
one type of atom
c)
smaller than an atom 
d)
an element
4.

How many Oxygen atoms are in H2O?

a)

1

b)

2

c)

0

d)

4

5.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
6.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
7.
(Element or Compound)
       C2H8O 
a)
Element
b)
Letters
c)
Numbers
d)
Compound
8.
What is krypton?
a)
element
b)
compound
c)
mixture
9.
Can be found on the periodic table
a)
Element
b)
Compound
c)
MIxture
10.
What is gold?
a)
element
b)
compound
c)
mixture
11.
What is sugar?
a)
element
b)
compound
c)
mixture
12.
What is water?
a)
element
b)
compound
c)
mixture
13.

This picture represents which of the following?

a)

molecular element

b)

molecular compound

c)

mixture

14.

This picture represents which of the following?

a)

molecular element

b)

molecular compound

c)

element

15.
a)
Element
b)
Molecule
c)
Compound
d)
Mixture
16.
Atoms combine to form _______. 
a)
electrons
b)
molecules
c)
nuclei
d)
neutrons
17.
A compound is...
a)
a substance made up of one type of atom in its molecular form.
b)
a substance formed by the reaction of two or more elements.
c)
a mixture formed by the mixing of two or more elements.
d)
a substance made up of one type of atom in its atomic form.
18.
What defines a mixture?
a)
described by a chemical formula
b)
can be broken down into its basic substances through physical means
c)
created through a chemical reaction
d)
cannot be broken down into simpler substances
19.
The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?
a)
compound
b)
liquid
c)
element
d)
mixture
20.

The smallest part of an element that retains the properties of the element is the

a)

nucleus.

b)

electron

c)

atom

d)

neutron

21.

How are mixtures separated?

a)

Chemical changes

b)

Physical Changes

c)

Chemical Properties

d)

Physical Properties

22.

Which of the following images best depicts the particles of an element?

a)

Picture 1

b)

Picture 2

c)

Picture 3

d)

Picture 4

23.

Structural differences between different chemicals can be represented in models of the particles. Which drawing BEST represents a compound?

a)

Picture A

b)

Picture B

c)

Picture C

d)

Picture D

24.
What is matter?
a)
Volume of an object
b)
Anything that has mass and takes up space
c)
Mass of an object
d)
Space of an object
25.
What are the 3 states of matter?
a)
Water, air, ball
b)
mass, volume, grams
c)
solid, liquid, gas
d)
chair, table, pencil

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