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Mixtures

In this worksheet, students will explore mixtures. Mixtures can involve elements, compounds or elements and compounds!

'Mixtures' worksheet

Key stage:  KS 3

Curriculum topic:   Chemistry: Pure and Impure Substances

Curriculum subtopic:   Mixtures, including Dissolving

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

A mixture is defined as:

 

'Two or more substances, mixed but not chemically joined.'

 

To put this a simpler way, it is two or more substances that are present in the same container but are not joined to each other by chemical bonds. 

 

This is shown in the diagrams below:

 

Shown here is a mixture of elements. An element contains only one type of atom and, because these atoms are not combined, it is a mixture of elements.

 

Atoms of elements mixed together

 

Shown here is a mixture of compounds. A compound is made of two or more elements chemically joined together. Look closely at the diagram and you will see the two different compounds but, because they are not joined to each other, it is a mixture of compounds.

 

 Mixture of compounds

 

Shown here is a mixture of an element and a compound. The two pink atoms combined represent the element. The atoms are the same and so this is an element. The compound is made of different atoms. Air is a mixture of elements such as nitrogen and oxygen but also contains a small amount of other gases such as carbon dioxide, and the noble gases.

 

Mixture of elements and compounds

 

Look at the pie chart carefully and use the information to match the percentage of each of the gases in air to the correct elements.

 

Pie chart of gases of the air

Column A

Column B

water vapour
1%
oxygen
0.03%
argon
78%
carbon dioxide
0.97%
nitrogen
20%

Which of the follwing substances are mixtures, elements or compounds?

Column A

Column B

air
element
pure water
mixture
carbon
compound
milk
compound
salt
element
magnesium
mixture

Which of the following correctly describes the diagram shown?

 

Mixture of elements

mixture of elements

mixture of compounds

mixture of elements and compounds

 Which of the following correctly describes the diagram shown?

 

 Mixture

mixture of elements

mixture of compounds

mixture of elements and compounds

 Which of the following correctly describes the diagram shown?

 

Mixture

mixture of elements

mixture of compounds

mixture of elements and compounds

 Which of the following correctly describes the diagram shown?

 

 Mixture

mixture of elements

mixture of compounds

mixture of elements and compounds

A student records the following observation:

 

'The two elements reacted together to produce a new white substance.'

 

Which of the following terms would describe the new substance?

mixture

compound

element

A student records the following observation:

 

'The contents of the beaker were easily separated into a clear solution and a yellow solid'.

 

Which of the following terms would describe the new substance?

mixture

compound

element

Which ONE of the following shows a pure compound?

 

Groups of atomic diagrams

A

B

C

D

Which TWO of the following boxes shows an element?

 

 Diagrams of mixtures of atoms

A

B

C

D

  • Question 1

Look at the pie chart carefully and use the information to match the percentage of each of the gases in air to the correct elements.

 

Pie chart of gases of the air

CORRECT ANSWER

Column A

Column B

water vapour
1%
oxygen
20%
argon
0.97%
carbon dioxide
0.03%
nitrogen
78%
EDDIE SAYS
Most of the air that we breathe is nitrogen. The percentages of each gas present in the air varies depending on your location; for example, if you are at the top of a very high mountain the levels of oxygen will be much lower.
  • Question 2

Which of the follwing substances are mixtures, elements or compounds?

CORRECT ANSWER

Column A

Column B

air
mixture
pure water
compound
carbon
element
milk
mixture
salt
compound
magnesium
element
EDDIE SAYS
Air and milk are mixtures. Mineral water is a mixture because it contains lots of substances (just look at the label!) but pure water contains only water so is classed as a compound. Salt has the chemical name of sodium chloride and so is classed as a compound.
  • Question 3

Which of the following correctly describes the diagram shown?

 

Mixture of elements

CORRECT ANSWER
mixture of elements
EDDIE SAYS
This is classed as mixture of elements because the purple atoms are combined but, because they are the same, it is classed as an element and the green atoms are not combined at all.
  • Question 4

 Which of the following correctly describes the diagram shown?

 

 Mixture

CORRECT ANSWER
mixture of elements and compounds
EDDIE SAYS
Shown in this diagram is an element (shown by the two red atoms combined) and a compound (which contains both red and blue atoms).
  • Question 5

 Which of the following correctly describes the diagram shown?

 

Mixture

CORRECT ANSWER
mixture of elements
EDDIE SAYS
Shown in this diagram is a mixture of elements: pairs of similar atoms mixed together.
  • Question 6

 Which of the following correctly describes the diagram shown?

 

 Mixture

CORRECT ANSWER
mixture of compounds
EDDIE SAYS
Both the molecules shown are compounds, because they contain more than one type of atom.
  • Question 7

A student records the following observation:

 

'The two elements reacted together to produce a new white substance.'

 

Which of the following terms would describe the new substance?

CORRECT ANSWER
compound
EDDIE SAYS
The new substance must be a compound. Compounds are produced by chemical reactions. The substance couldn't be an element because two substances combined to make it.
  • Question 8

A student records the following observation:

 

'The contents of the beaker were easily separated into a clear solution and a yellow solid'.

 

Which of the following terms would describe the new substance?

CORRECT ANSWER
mixture
EDDIE SAYS
Mixtures are far easier to separate than breaking compounds back into the elements that formed them.
  • Question 9

Which ONE of the following shows a pure compound?

 

Groups of atomic diagrams

CORRECT ANSWER
C
EDDIE SAYS
Box C shows molecules of a compound (different atoms combined together). Box D shows a mixture of compounds.
  • Question 10

Which TWO of the following boxes shows an element?

 

 Diagrams of mixtures of atoms

CORRECT ANSWER
A
B
EDDIE SAYS
Box A and B show only elements, i.e. the same atoms in each box.
---- OR ----

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