Compounds, mixtures and elements

Compounds, mixtures and elements

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Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about grouping substances as compounds, mixtures or elements.
A compound is a substance that contains atoms of two or more elements joined together and cannot be easily separated.
A mixture is a substance composed of two or more forms of matter that can be easily separated.
An element is a pure substance composed of one type of atom.

Question

a)  The diagrams represent different types of atoms.
     i) Which diagram shows a mixture?

    • compounds-mixtures-substances-image-A.png

    • compounds-mixtures-substances-image-B.png

    • compounds-mixtures-substances-image-C.png

Question

     ii)  Which diagram shows a compound? 

    • compounds-mixtures-substances-image-A.png

    • compounds-mixtures-substances-image-B.png

    • compounds-mixtures-substances-image-C.png

Question Change answer

b)  Here are twelve substances. Six are compounds, four are mixtures and two are elements.
     Group the substances into the correct boxes.
sea water
iron
air
water
oxygen
sugar
milk
copper oxide
sand
carbon dioxide
rust
salt
Compounds
Mixtures
Elements
Task administration: 
This task can be completed with pencil and paper or online (with auto marking displayed to students).
Level:
5
Curriculum info: 
Science, Communicating in science, Material World, Knowledge, Material World
Keywords: 
properties, mixtures, compounds, elements, diagrams, vocabulary
Description of task: 
Students classify 12 common substances as either a compound, mixture, or element.
Curriculum Links: 
Science capabilities
The capabilities focus is brought about by the conversations you have and the questions you ask.
 
Capability: Interpret representations
This resource provides opportunities to interpet diagrams of elements, mixtures and compounds.
Science capabilities: 
Interpret representations
Answers/responses: 
   Y10 (05/1999)
a)
i)
 
 
 
 
 
 
 
ii)
 compounds-mixtures-substances-image-B.png
compounds-mixtures-substances-image-C.png		 very easy
easy
b)  
To answer b) students need to know the chemical composition of these substances to answer the questions correctly.
 
Compounds          Mixtures             Elements

water                     air                         oxygen

salt                        milk                       iron

carbon dioxide      sand

rust                       sea water

sugar

copper oxide

 compounds
6 correct – very difficult

4-5 correct – moderate

2-3 correct – very easy

mixtures
4 correct – very difficult

2-3 correct – very easy

elements
moderate