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Atoms, Elements & Compounds

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.
What is a compound?
a)
an atom with more electrons than protons
b)
a substance in which the atoms of two or more elements are combined together
c)
an atom with more neutrons than protons
d)
a substance in which the atoms of three or more elements are combined together
2.
Atoms combine to form _______. 
a)
electrons
b)
molecules
c)
nuclei
d)
neutrons
3.
The element oxygen, represented by the symbol O, is classified as
a)
a pure substance
b)
a compound
c)
a mixture
d)
a solution
4.
What is the picture displayed?
a)
atom
b)
element
c)
molecule
d)
compound
5.
Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).
a)
methane is an element and carbon and hydrogen are compounds.
b)
carbon, hydrogen, and methane are all elements.
c)
carbon, hydrogen, and methane are all compounds.
d)
carbon and hydrogen are elements and methane is a compound.
6.
What is the picture displayed?
a)
atom
b)
element
c)
molecule
d)
compound
7.
Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?
a)
Hydrogen is an element made of two or more kinds of atoms.
b)
Hydrogen is a compound made of only one kind of atom.
c)
Hydrogen is a compound made of two or more kinds of atoms.
d)
Hydrogen is an element made of only one kind of atom.
8.
Carbon dioxide is formed when two oxygen atoms chemically combine with a carbon atom. Which term best describes carbon dioxide?
a)
atom
b)
mixture
c)
element
d)
compound
9.
TRUE OR FALSE:
Every compound is a molecule but not every molecule is a compound.
a)
TRUE
b)
FALSE
10.
What is the term for combining 2 or more DIFFERENT atoms together?
a)
atoms
b)
elements
c)
molecules
d)
compounds
11.
What is the picture displayed?
a)
atom
b)
element
c)
molecule
d)
compound
12.
Are these molecules also compounds?
a)
YES
b)
NO
13.
Are these molecules also compounds?
a)
YES
b)
NO
14.

Which is the correct definition for an element?

a)

A substance made up of only one type of atom that can be broken down

b)

Two or more substances that are not chemically combined

c)

Two or more different atoms that are chemically combined

d)

A substance made up of only one type of atom that cannot be broken down

15.

The smallest part of an element is called...

a)

a compound

b)

a mixture

c)

an element

d)

an atom

16.

Which is the correct definition for a compound?

a)

A substance made up of only one type of atom that can be broken down

b)

Two or more substances that are not chemically combined

c)

Two or more different atoms that are chemically combined

d)

A substance made up of only one type of atom that cannot be broken down

17.

What is the missing word? The properties of a compound are __________ the elements it is made up of.

a)

the same as

b)

different to

18.

Which is correct?

a)

iron and sulfur are both metals

b)

iron and sulfur are both non metals

c)

iron is a non metal and sulfur is a metal

d)

iron is a metal and sulfur is a non metal

19.

Which elements are present in H2SO4?

a)

hydrogen and oxygen

b)

hydrogen, oxygen and sodium

c)

hydrogen, oxygen and sulfur

d)

hydrogen, oxygen and silicon

20.

How many atoms of aluminium are there in the chemical formula for aluminium oxide: Al2O3

a)

2

b)

3

c)

5

d)

1

21.

What is the chemical symbol for copper?

a)

C

b)

Co

c)

Cp

d)

Cu

22.

What is the correct name for CO?

a)

carbon dioxide

b)

carbon monoxide

c)

cobalt

d)

carbon oxide

23.

Is water an element or a compound?

a)

compound

b)

element

24.

True or false: Hydrogen atoms go around in pairs called molecules

a)

True

b)

False

25.

What is the name of the compound formed from sodium and chlorine?

a)

sodium chlorine

b)

schloride

c)

sodium chloride

d)

chloride sodium

26.
Elements can be broken down into simpler substances. 
a)
false 
b)
true 
c)
sometimes 
27.
Compounds contain a _____ set of elements.
a)
fixed
b)
random 
c)
sweet 
d)
inaccurate 
28.
A compound is made of ________ atoms. 
a)
big 
b)
similar 
c)
different 
29.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
30.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
31.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
32.

What is the name of the compound when Copper reacts with Sulphur and Oxygen?

a)

Copper Sulphide

b)

Copper Sulphite

c)

Copper Sulphate

d)

Copper Sulphur Oxide

33.

If CO is Carbon Monoxide, why is CO2 Carbon Dioxide

a)

Scientists are weird

b)

CO2 has 2 atoms of Oxygen

c)

They can't have the same name

d)

CO is an element but CO2 is a compound

34.
Which statement below is TRUE about compounds?
a)
The properties of compounds are totally different than the properties of the elements that form them
b)
All compounds are listed on the Periodic Table of Elements
c)
A compound is a pure substance that is made from one type of atom
d)
The properties of compounds are the same as the properties of the elements that form them
35.
TRUE OR FALSE:
There are millions of elements.
a)
True
b)
False
36.
How many TOTAL atoms make up the molecule 8K2SO4?
a)
8
b)
56
c)
7
d)
15
37.
What is the picture displayed?
a)
Atom
b)
Element
c)
Molecule
d)
Compound
38.
Which two particles make up the nucleus of an atom?
a)
protons and electrons
b)
protons and neutrons
c)
molecules and compounds
d)
neutrons and electrons
39.
What is at the center of every atom?
a)
An electron
b)
A compound
c)
A nucleus
d)
A molecule
40.
How many elements are on the periodic table?
a)
53
b)
116
c)
200
d)
160

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